{ "slug": "diffblue", "name": "Diffblue Cover", "company": "Diffblue Limited", "website": "https://www.diffblue.com/", "category": "coding", "business_model": "freemium", "availability": "global", "launched": "2020", "founded": "2016", "hq_country": "GB", "pricing_url": "https://www.diffblue.com/pricing/", "tags": [ "unit-testing", "java", "code-quality", "test-generation", "on-prem" ], "description": "Autonomous Java unit-test generation: Diffblue Cover writes, maintains, and repairs tests with a deterministic reinforcement-learning engine that runs in the customer's own environment.", "overview": "Diffblue Limited is a spin-out of the University of Oxford AI research group, and its own legal page gives the registered office as 5 New Street Square, London EC4A 3TW, registered in England and Wales under company number 09958102. The vendor's timeline dates the spin-out to 2016 and the launch of Diffblue Cover to 2020. Cover writes Java unit tests autonomously: the company says its reinforcement-learning engine produces tests that compile and pass without a human reviewing each line, advertises up to 250x a developer's speed, and sells on-premise operation so code is never shared. The current packaging runs the testing agent on top of an approved coding platform such as GitHub Copilot CLI or Claude Code. The limitation is language reach: the pages read advertise Java, with other languages and agent integrations marked coming soon rather than supported.", "features": [ "Autonomous generation of Java unit tests from an existing codebase", "Tests are maintained and updated as the code changes", "Deterministic reinforcement-learning engine that does not use a large language model, so generated tests compile and run", "On-premise operation behind the customer's firewall, with air-gapped deployment for regulated environments", "Pricing charged per net new line of coverage rather than per seat or API call", "Runs as an agent on top of an approved coding platform such as GitHub Copilot CLI or Claude Code" ], "use_cases": [ "Raising unit-test coverage on a legacy Java codebase before modernisation", "Adding regression tests in CI without hand-writing each case", "Keeping source code off external model providers for regulated or air-gapped projects" ], "pricing_notes": "Pricing is outcome-based rather than per seat: the published starter package is $1,500 for 5,000 net new lines of coverage, an effective $0.30 per line, with enterprise packages quoted. Cover Community Edition is a free edition for open-source and commercial use.", "faq": [ { "q": "What is Diffblue Cover?", "a": "It is an AI tool for Java that generates unit tests automatically: it reads the codebase, writes tests that compile and pass, and maintains them as the code changes." }, { "q": "Where is Diffblue based?", "a": "Diffblue Limited's own legal page states a registered office at 5 New Street Square, London EC4A 3TW, and company number 09958102, registered in England and Wales." }, { "q": "Does Diffblue Cover use a large language model?", "a": "The vendor differentiates it from LLM-based assistants: it says the generator uses reinforcement learning rather than a large language model, so the tests are deterministic and it can run on-premise without sending code to a third party." }, { "q": "What does this record not establish?", "a": "The pages read do not state licence terms, the product's own interface languages, or supported integrations beyond the ones the vendor names, so those fields remain unconfirmed." } ], "i18n": { "zh": { "description": "面向 Java 的自主单元测试生成工具：Diffblue Cover 用确定性的强化学习引擎编写、维护并修复测试，且可运行在客户自有环境中。", "overview": "Diffblue Limited 源自牛津大学 AI 研究组的拆分，其官网法律页给出的注册地址为 5 New Street Square, London EC4A 3TW，在英格兰和威尔士注册，公司编号 09958102。厂商的时间线把拆分标为 2016 年，把 Diffblue Cover 的发布标为 2020 年。Cover 可自主编写 Java 单元测试：公司称其强化学习引擎生成的测试能够编译并通过，无需人工逐行审查，并宣称速度可达人类开发者的 250 倍，同时以本地部署保证代码不外流。当前的打包方式是把测试代理架在已获企业批准的编码平台之上，例如 GitHub Copilot CLI 或 Claude Code。局限在语言覆盖：本次读取的页面主推 Java，其他语言与代理集成标注为即将支持，而非已支持。", "features": [ "基于既有代码库自主生成 Java 单元测试", "随代码变更持续维护并更新测试", "不使用大语言模型的确定性强化学习引擎，生成的测试可编译可运行", "在客户防火墙内本地部署，受监管场景可选气隙部署", "按净新增覆盖行数计费，而非按席位或 API 调用", "作为代理运行在已获批的编码平台之上，例如 GitHub Copilot CLI 或 Claude Code" ], "use_cases": [ "在遗留 Java 代码库现代化之前提升单元测试覆盖率", "在 CI 中加入回归测试，无需逐条手写用例", "为受监管或气隙项目把源代码留在外部模型厂商之外" ], "pricing_notes": "计费按结果而非席位：公布的入门包为 5,000 行净新增覆盖收 1,500 美元，折合每行 0.30 美元；企业包按报价。Cover Community Edition 为免费版本，开源与商业用途均可使用。", "faq": [ { "q": "Diffblue Cover 是什么？", "a": "它是一款面向 Java 的 AI 工具，可自动生成单元测试：读取代码库、编写能够编译并通过的测试，并随代码变化维护这些测试。" }, { "q": "Diffblue 总部在哪里？", "a": "Diffblue Limited 的官网法律页写明注册地址为 5 New Street Square, London EC4A 3TW，公司编号 09958102，注册于英格兰和威尔士。" }, { "q": "Diffblue Cover 使用大语言模型吗？", "a": "厂商将其与基于大模型的助手区分开：它称生成器使用强化学习而非大语言模型，因此测试是确定性的，并可本地部署，不必把代码发给第三方。" }, { "q": "这条记录没有确立哪些内容？", "a": "本次读取的页面没有写明许可条款、产品自身的界面语言，也没有列出厂商点名之外的集成支持，因此这些字段仍未确认。" } ], "facts": { "diffblue.hq.registered-office": { "conditions": "据 diffblue.com/legal and diffblue.com/privacy 于 2026-10-12 所述", "note": "在厂商法律页面上匹配到: \"We are Diffblue Limited … a company registered in England and Wales number 09958102, VAT number GB 233910133, with our registered office at Diffblue Limited, 5 New Street Square, London, EC4A 3TW.\" The privacy policy repeats the same registered office." } }, "selection_evidence": { "tasks": { "note": "由记录推导而来：该产品用于编写与维护测试代码，而非审查或解释代码。" }, "form_factor": { "note": "所读主页称“Diffblue CLI runs locally”，因此 CLI 是最接近的单一形态，尽管还存在 IDE 插件与一个智能体。" }, "platforms": { "note": "由所读页面推导而来：主页描述了一个本地 CLI，且所读的维基百科条目将 Community Edition IntelliJ 插件列为 Diffblue Docs 文档。" }, "deployment": { "note": "在厂商关于页面上匹配到：\"Plus, we operate on-prem so your code stays within your own environment, never seen and never shared\", with the homepage adding that the Diffblue CLI runs locally." }, "offline": { "note": "记录中不包含离线运行的声明；本地部署本身并不说明该产品可在无网络下工作。" }, "regions": { "note": "与记录中已有的可用地域字段（“global”）一致；所读页面上没有发布按区域划分的服务清单。" }, "api": { "note": "本轮未读取 API 参考页面，因此不作出 API 断言。" }, "license": { "note": "商业产品；所读页面上未发布源代码许可证。" }, "commercial_use": { "note": "商业产品；Community Edition 被描述为可供商业组织使用，但未读到明确的商用授权。" }, "billing": { "note": "厂商定价页面按净新增覆盖行数发布用量定价，并对企业套餐按报价处理；存在免费的 Community Edition，但两档之间没有可比的 paid_from 数值，因此未设置。" }, "languages": { "note": "本轮所读的任何厂商页面都未说明产品自身的界面语言；保留该键是为了日后能作答，而不是留空。" } } }, "es": { "description": "Generación autónoma de pruebas unitarias para Java: Diffblue Cover escribe, mantiene y repara pruebas con un motor determinista de aprendizaje por refuerzo que se ejecuta en el entorno del cliente.", "overview": "Diffblue Limited es una escisión del grupo de investigación en IA de la Universidad de Oxford, y su propia página legal indica un domicilio social en 5 New Street Square, Londres EC4A 3TW, registrada en Inglaterra y Gales con el número de sociedad 09958102. La cronología del proveedor sitúa la escisión en 2016 y el lanzamiento de Diffblue Cover en 2020. Cover escribe pruebas unitarias de Java de forma autónoma: la empresa afirma que su motor de aprendizaje por refuerzo produce pruebas que compilan y pasan sin que una persona revise cada línea, anuncia hasta 250 veces la velocidad de un desarrollador y vende ejecución on-premise para que el código nunca se comparta. El empaquetado actual ejecuta el agente de pruebas sobre una plataforma de código aprobada, como GitHub Copilot CLI o Claude Code. La limitación es el alcance de lenguajes: las páginas leídas anuncian Java, y otros lenguajes e integraciones de agentes figuran como próximos, no como compatibles.", "features": [ "Generación autónoma de pruebas unitarias de Java a partir de una base de código existente", "Las pruebas se mantienen y actualizan cuando cambia el código", "Motor determinista de aprendizaje por refuerzo que no usa un modelo de lenguaje, por lo que las pruebas compilan y se ejecutan", "Ejecución on-premise tras el cortafuegos del cliente, con despliegue aislado para entornos regulados", "Facturación por líneas netas nuevas de cobertura, no por asiento ni por llamada a API", "Se ejecuta como agente sobre una plataforma de código aprobada, como GitHub Copilot CLI o Claude Code" ], "use_cases": [ "Elevar la cobertura de pruebas unitarias de una base de código Java heredada antes de modernizarla", "Añadir pruebas de regresión en CI sin escribir cada caso a mano", "Mantener el código fuente fuera de proveedores de modelos externos en proyectos regulados o aislados" ], "pricing_notes": "El precio se basa en resultados, no en asientos: el paquete inicial publicado son 1.500 $ por 5.000 líneas netas nuevas de cobertura, 0,30 $ por línea, y los paquetes empresariales se cotizan. Cover Community Edition es una edición gratuita para uso open source y comercial.", "faq": [ { "q": "¿Qué es Diffblue Cover?", "a": "Es una herramienta de IA para Java que genera pruebas unitarias automáticamente: lee la base de código, escribe pruebas que compilan y pasan, y las mantiene a medida que el código cambia." }, { "q": "¿Dónde está radicada Diffblue?", "a": "La propia página legal de Diffblue Limited indica un domicilio social en 5 New Street Square, Londres EC4A 3TW, y el número de sociedad 09958102, registrada en Inglaterra y Gales." }, { "q": "¿Diffblue Cover usa un modelo de lenguaje?", "a": "El proveedor lo diferencia de los asistentes basados en modelos de lenguaje: afirma que el generador usa aprendizaje por refuerzo en lugar de un modelo de lenguaje, de modo que las pruebas son deterministas y puede ejecutarse on-premise sin enviar el código a terceros." }, { "q": "¿Qué no establece este registro?", "a": "Las páginas leídas no indican términos de licencia, los idiomas de interfaz propios del producto ni integraciones más allá de las que nombra el proveedor, por lo que esos campos siguen sin confirmar." } ], "facts": { "diffblue.hq.registered-office": { "conditions": "Según lo indicado en diffblue.com/legal and diffblue.com/privacy el 2026-10-12", "note": "Coincidencia en la página legal del proveedor: \"We are Diffblue Limited … a company registered in England and Wales number 09958102, VAT number GB 233910133, with our registered office at Diffblue Limited, 5 New Street Square, London, EC4A 3TW.\" The privacy policy repeats the same registered office." } }, "selection_evidence": { "tasks": { "note": "Derivado del registro: el producto escribe y mantiene código de pruebas en lugar de revisarlo o explicarlo." }, "form_factor": { "note": "La página principal consultada dice «Diffblue CLI runs locally», por lo que la CLI es la forma única más cercana, aunque también existen plugins de IDE y un agente." }, "platforms": { "note": "Derivado de las páginas consultadas: la página principal describe una CLI local, y el artículo de Wikipedia consultado menciona el plugin IntelliJ de Community Edition como documento de Diffblue Docs." }, "deployment": { "note": "Encontrado en la página «acerca de» del proveedor: \"Plus, we operate on-prem so your code stays within your own environment, never seen and never shared\", with the homepage adding that the Diffblue CLI runs locally." }, "offline": { "note": "El registro no contiene ninguna afirmación de funcionamiento sin conexión; la operación local no indica por sí misma que el producto funcione sin red." }, "regions": { "note": "Refleja el campo de disponibilidad ya presente en el registro («global»); en las páginas consultadas no se publicó ninguna lista de servicios por región." }, "api": { "note": "En esta pasada no se leyó ninguna página de referencia de la API, por lo que no se afirma nada sobre la API." }, "license": { "note": "Producto comercial; no se publica licencia del código fuente en las páginas consultadas." }, "commercial_use": { "note": "Producto comercial; la Community Edition se describe como utilizable por organizaciones comerciales, pero no se leyó ninguna concesión explícita de uso comercial." }, "billing": { "note": "La página de precios del proveedor publica precios por uso según líneas nuevas netas de cobertura y cotiza paquetes empresariales; existe una Community Edition gratuita, pero los dos niveles no comparten una cifra paid_from comparable, por lo que no se fija ninguna." }, "languages": { "note": "Ninguna página del proveedor consultada en esta pasada indica los idiomas de interfaz del propio producto; la clave existe para poder responder al campo más adelante en lugar de dejarlo ausente." } } }, "fr": { "description": "Génération autonome de tests unitaires Java : Diffblue Cover écrit, maintient et répare les tests avec un moteur déterministe d'apprentissage par renforcement exécuté dans l'environnement du client.", "overview": "Diffblue Limited est une émanation du groupe de recherche en IA de l'université d'Oxford, et sa propre page légale indique un siège social au 5 New Street Square, Londres EC4A 3TW, immatriculée en Angleterre et au pays de Galles sous le numéro 09958102. La chronologie de l'éditeur situe l'essaimage en 2016 et le lancement de Diffblue Cover en 2020. Cover écrit des tests unitaires Java de façon autonome : la société affirme que son moteur d'apprentissage par renforcement produit des tests qui compilent et passent sans relecture humaine ligne à ligne, annonce jusqu'à 250 fois la vitesse d'un développeur et vend une exécution sur site pour que le code ne soit jamais partagé. Le conditionnement actuel exécute l'agent de test au-dessus d'une plateforme de code approuvée, comme GitHub Copilot CLI ou Claude Code. La limite tient à la couverture linguistique : les pages consultées annoncent Java, les autres langages et intégrations d'agents étant présentés comme à venir, non comme pris en charge.", "features": [ "Génération autonome de tests unitaires Java à partir d'une base de code existante", "Les tests sont maintenus et mis à jour à chaque évolution du code", "Moteur déterministe d'apprentissage par renforcement sans grand modèle de langage, donc des tests qui compilent et s'exécutent", "Exécution sur site derrière le pare-feu du client, avec déploiement isolé pour les environnements réglementés", "Facturation à la ligne nette de couverture ajoutée, et non au siège ni à l'appel d'API", "S'exécute comme agent au-dessus d'une plateforme de code approuvée, comme GitHub Copilot CLI ou Claude Code" ], "use_cases": [ "Augmenter la couverture de tests unitaires d'une base Java héritée avant sa modernisation", "Ajouter des tests de non-régression en CI sans écrire chaque cas à la main", "Garder le code source hors des fournisseurs de modèles externes pour les projets réglementés ou isolés" ], "pricing_notes": "La tarification est fondée sur le résultat, non sur le siège : l'offre de démarrage publiée est de 1 500 $ pour 5 000 lignes nettes de couverture ajoutée, soit 0,30 $ par ligne, les offres d'entreprise étant sur devis. Cover Community Edition est une édition gratuite, pour l'open source comme pour un usage commercial.", "faq": [ { "q": "Qu'est-ce que Diffblue Cover ?", "a": "C'est un outil d'IA pour Java qui génère automatiquement des tests unitaires : il lit la base de code, écrit des tests qui compilent et passent, puis les maintient à mesure que le code évolue." }, { "q": "Où Diffblue est-elle établie ?", "a": "La page légale de Diffblue Limited indique un siège social au 5 New Street Square, Londres EC4A 3TW, et le numéro de société 09958102, immatriculée en Angleterre et au pays de Galles." }, { "q": "Diffblue Cover utilise-t-il un grand modèle de langage ?", "a": "L'éditeur le distingue des assistants fondés sur les grands modèles : selon lui, le générateur utilise l'apprentissage par renforcement plutôt qu'un grand modèle de langage, ce qui rend les tests déterministes et permet une exécution sur site sans transmettre le code à un tiers." }, { "q": "Que n'établit pas cette fiche ?", "a": "Les pages consultées n'indiquent pas les termes de licence, les langues d'interface du produit ni d'autres intégrations que celles nommées par l'éditeur, ces champs restent donc non confirmés." } ], "facts": { "diffblue.hq.registered-office": { "conditions": "Comme indiqué sur diffblue.com/legal and diffblue.com/privacy le 2026-10-12", "note": "Correspondance sur la page légale de l'éditeur: \"We are Diffblue Limited … a company registered in England and Wales number 09958102, VAT number GB 233910133, with our registered office at Diffblue Limited, 5 New Street Square, London, EC4A 3TW.\" The privacy policy repeats the same registered office." } }, "selection_evidence": { "tasks": { "note": "Déduit de la fiche : le produit écrit et maintient du code de test plutôt que de le relire ou de l'expliquer." }, "form_factor": { "note": "La page d'accueil consultée indique « Diffblue CLI runs locally » ; la CLI est donc la forme unique la plus proche, même s'il existe aussi des plugins IDE et un agent." }, "platforms": { "note": "Déduit des pages consultées : la page d'accueil décrit une CLI locale, et l'article Wikipédia consulté cite le plugin IntelliJ Community Edition comme document Diffblue Docs." }, "deployment": { "note": "Correspondance sur la page « à propos » du fournisseur : \"Plus, we operate on-prem so your code stays within your own environment, never seen and never shared\", with the homepage adding that the Diffblue CLI runs locally." }, "offline": { "note": "La fiche ne contient aucune affirmation de fonctionnement hors ligne ; l'exploitation sur site n'indique pas en soi que le produit fonctionne sans réseau." }, "regions": { "note": "Reprend le champ de disponibilité déjà présent dans la fiche (« global ») ; aucune liste de services par région n'a été publiée sur les pages consultées." }, "api": { "note": "Aucune page de référence d'API n'a été lue lors de cette passe, donc aucune affirmation d'API n'est faite." }, "license": { "note": "Produit commercial ; aucune licence du code source n'est publiée sur les pages consultées." }, "commercial_use": { "note": "Produit commercial ; la Community Edition est décrite comme utilisable par des organisations commerciales, mais aucune autorisation explicite d'usage commercial n'a été lue." }, "billing": { "note": "La page tarifaire du fournisseur publie une tarification à l'usage selon les lignes de couverture nettes nouvelles et chiffre des offres entreprise ; une Community Edition gratuite existe, mais les deux paliers ne partagent pas de valeur paid_from comparable, donc aucune n'est définie." }, "languages": { "note": "Aucune page du fournisseur consultée lors de cette passe n'indique les langues d'interface du produit lui-même ; la clé existe pour que le champ puisse être renseigné plus tard plutôt que laissé absent." } } }, "ja": { "description": "Java 向けの自律型ユニットテスト生成。Diffblue Cover は決定的な強化学習エンジンでテストを作成・保守・修復し、顧客自身の環境で実行できる。", "overview": "Diffblue Limited はオックスフォード大学の AI 研究グループからのスピンアウトで、自社の法務ページには登録事務所を 5 New Street Square, London EC4A 3TW と記載し、イングランドおよびウェールズに会社番号 09958102 で登記されています。ベンダーの沿革はスピンアウトを 2016 年、Diffblue Cover の提供開始を 2020 年としています。Cover は Java のユニットテストを自律的に作成します。同社によれば強化学習エンジンが生成するテストはコンパイルと実行が通り、人間が一行ずつ確認する必要はなく、速度は開発者の最大 250 倍とされ、オンプレミス実行によりコードは外部に共有されません。現在の提供形態は、GitHub Copilot CLI や Claude Code など承認済みのコーディング基盤の上でテストエージェントを動かすものです。制約は対応言語で、今回参照したページが訴求するのは Java のみで、他言語やエージェント連携は対応済みではなく近日対応とされています。", "features": [ "既存コードベースからの Java ユニットテストの自律生成", "コード変更に合わせてテストを継続的に保守・更新", "大規模言語モデルを使わない決定的な強化学習エンジンで、生成テストはコンパイル・実行できる", "顧客のファイアウォール内でのオンプレミス実行、規制環境向けのエアギャップ配備にも対応", "課金は席数や API 呼び出しではなく、純増のカバレッジ行数に基づく", "GitHub Copilot CLI や Claude Code など承認済みのコーディング基盤上でエージェントとして動作" ], "use_cases": [ "モダナイズ前のレガシー Java コードベースでユニットテスト網羅率を引き上げる", "各ケースを手書きせずに CI へ回帰テストを追加する", "規制対象やエアギャップの案件でソースコードを外部モデル提供者に渡さない" ], "pricing_notes": "料金は席数ではなく成果に基づきます。公開されているスターターパッケージは純増カバレッジ 5,000 行で 1,500 ドル、1 行あたり実質 0.30 ドルで、エンタープライズ向けは見積もりです。Cover Community Edition はオープンソースにも商用にも使える無償版です。", "faq": [ { "q": "Diffblue Cover とは何ですか？", "a": "Java 向けの AI ツールで、ユニットテストを自動生成します。コードベースを読み、コンパイルと実行が通るテストを作成し、コードの変化に合わせて保守します。" }, { "q": "Diffblue はどこに拠点がありますか？", "a": "Diffblue Limited の法務ページには、登録事務所が 5 New Street Square, London EC4A 3TW、会社番号 09958102、イングランドおよびウェールズでの登記と記載されています。" }, { "q": "Diffblue Cover は大規模言語モデルを使いますか？", "a": "ベンダーは大規模言語モデル系のアシスタントと区別しています。生成器は大規模言語モデルではなく強化学習を使うため、テストは決定的で、コードを第三者に送らずにオンプレミスで実行できるとしています。" }, { "q": "この記録が確立していないことは？", "a": "今回参照したページには、ライセンス条件、製品自身の対応インターフェース言語、ベンダーが挙げた以外の連携対応が書かれていないため、これらの項目は未確認のままです。" } ], "facts": { "diffblue.hq.registered-office": { "conditions": "diffblue.com/legal and diffblue.com/privacy の 2026-10-12 時点の記載による", "note": "ベンダーの法務ページで一致: \"We are Diffblue Limited … a company registered in England and Wales number 09958102, VAT number GB 233910133, with our registered office at Diffblue Limited, 5 New Street Square, London, EC4A 3TW.\" The privacy policy repeats the same registered office." } }, "selection_evidence": { "tasks": { "note": "レコードから導出しました。この製品はコードをレビュー・説明するのではなく、テスト コードを作成・保守します。" }, "form_factor": { "note": "参照したホームページには「Diffblue CLI runs locally」とあり、IDE プラグインやエージェントも存在しますが、CLI が最も近い単一の形態です。" }, "platforms": { "note": "参照したページから導出しました。ホームページはローカル CLI を説明しており、参照した Wikipedia 記事は Community Edition IntelliJ プラグインを Diffblue Docs のドキュメントとして挙げています。" }, "deployment": { "note": "ベンダーの会社概要ページで一致：\"Plus, we operate on-prem so your code stays within your own environment, never seen and never shared\", with the homepage adding that the Diffblue CLI runs locally." }, "offline": { "note": "レコードにはオフライン動作の主張が含まれていません。オンプレミス運用自体は、ネットワークなしで動作することを示すものではありません。" }, "regions": { "note": "レコードに既にある可用性フィールド（「global」）と一致します。参照したページにリージョン別のサービス一覧は公開されていませんでした。" }, "api": { "note": "今回のパスでは API リファレンス ページを確認していないため、API に関する主張は行いません。" }, "license": { "note": "商用製品で、参照したページにはソースコードのライセンスが公開されていません。" }, "commercial_use": { "note": "商用製品です。Community Edition は商業組織でも利用可能と説明されていますが、明示的な商用利用許諾は確認できませんでした。" }, "billing": { "note": "ベンダーの料金ページは純増カバレッジ行数に応じた従量課金を公開し、エンタープライズ パッケージは見積もり扱いです。無料の Community Edition はありますが、両プランで比較可能な paid_from 値を共有できないため、設定していません。" }, "languages": { "note": "今回のパスで参照したどのベンダー ページにも、製品自身の UI 言語は記載されていません。このキーは、フィールドを空にするのではなく後で回答できるようにするために存在します。" } } }, "de": { "description": "Autonome Unit-Test-Generierung für Java: Diffblue Cover schreibt, pflegt und repariert Tests mit einer deterministischen Reinforcement-Learning-Engine, die in der Umgebung des Kunden läuft.", "overview": "Diffblue Limited ist ein Spin-off der KI-Forschungsgruppe der Universität Oxford; die eigene Rechtsseite nennt einen eingetragenen Sitz in 5 New Street Square, London EC4A 3TW, registriert in England und Wales unter der Firmennummer 09958102. Die Zeitleiste des Anbieters datiert das Spin-off auf 2016 und die Einführung von Diffblue Cover auf 2020. Cover schreibt Java-Unit-Tests autonom: Laut Anbieter erzeugt die Reinforcement-Learning-Engine Tests, die kompilieren und bestehen, ohne dass ein Mensch jede Zeile prüft; beworben wird bis zur 250-fachen Geschwindigkeit eines Entwicklers, und der On-Premises-Betrieb soll sicherstellen, dass Code nie geteilt wird. Die aktuelle Verpackung lässt den Testagenten auf einer freigegebenen Coding-Plattform wie GitHub Copilot CLI oder Claude Code laufen. Die Einschränkung ist die Sprachabdeckung: Die gelesenen Seiten bewerben Java, weitere Sprachen und Agent-Integrationen sind als „coming soon“ und nicht als unterstützt ausgewiesen.", "features": [ "Autonome Erzeugung von Java-Unit-Tests aus einer bestehenden Codebasis", "Tests werden gepflegt und bei Codeänderungen aktualisiert", "Deterministische Reinforcement-Learning-Engine ohne großes Sprachmodell, sodass erzeugte Tests kompilieren und laufen", "On-Premises-Betrieb hinter der Firewall des Kunden, mit abgeschottetem Deployment für regulierte Umgebungen", "Abrechnung nach netto neu abgedeckten Zeilen statt nach Sitz oder API-Aufruf", "Läuft als Agent auf einer freigegebenen Coding-Plattform wie GitHub Copilot CLI oder Claude Code" ], "use_cases": [ "Die Unit-Test-Abdeckung einer gewachsenen Java-Codebasis vor der Modernisierung erhöhen", "Regressionstests in der CI ergänzen, ohne jeden Fall von Hand zu schreiben", "Quellcode in regulierten oder abgeschotteten Projekten von externen Modellanbietern fernhalten" ], "pricing_notes": "Die Abrechnung erfolgt ergebnisbasiert statt pro Sitz: Das veröffentlichte Startpaket kostet 1.500 $ für 5.000 netto neue abgedeckte Zeilen, also 0,30 $ pro Zeile; Enterprise-Pakete werden auf Angebot erstellt. Die Cover Community Edition ist eine kostenlose Edition für Open Source und kommerzielle Nutzung.", "faq": [ { "q": "Was ist Diffblue Cover?", "a": "Ein KI-Werkzeug für Java, das Unit-Tests automatisch erzeugt: Es liest die Codebasis, schreibt Tests, die kompilieren und bestehen, und pflegt sie, wenn sich der Code ändert." }, { "q": "Wo ist Diffblue ansässig?", "a": "Die eigene Rechtsseite von Diffblue Limited nennt einen eingetragenen Sitz in 5 New Street Square, London EC4A 3TW, und die Firmennummer 09958102, registriert in England und Wales." }, { "q": "Verwendet Diffblue Cover ein großes Sprachmodell?", "a": "Der Anbieter grenzt es von LLM-basierten Assistenten ab: Der Generator nutze Reinforcement Learning statt eines großen Sprachmodells, daher seien die Tests deterministisch und könnten on-premises laufen, ohne Code an Dritte zu geben." }, { "q": "Was belegt dieser Datensatz nicht?", "a": "Die gelesenen Seiten nennen keine Lizenzbedingungen, keine eigenen Oberflächensprachen des Produkts und keine über die genannten hinausgehenden Integrationen, diese Felder bleiben daher unbestätigt." } ], "facts": { "diffblue.hq.registered-office": { "conditions": "Wie auf diffblue.com/legal and diffblue.com/privacy am 2026-10-12 angegeben", "note": "Auf der Rechtsseite des Anbieters gefunden: \"We are Diffblue Limited … a company registered in England and Wales number 09958102, VAT number GB 233910133, with our registered office at Diffblue Limited, 5 New Street Square, London, EC4A 3TW.\" The privacy policy repeats the same registered office." } }, "selection_evidence": { "tasks": { "note": "Abgeleitet aus dem Datensatz: Das Produkt schreibt und pflegt Testcode, statt Code zu prüfen oder zu erklären." }, "form_factor": { "note": "Die gelesene Startseite nennt „Diffblue CLI runs locally“, daher ist die CLI die nächstliegende einzelne Form, obwohl auch IDE-Plugins und ein Agent existieren." }, "platforms": { "note": "Abgeleitet aus den gelesenen Seiten: Die Startseite beschreibt eine lokale CLI, und der gelesene Wikipedia-Artikel nennt das IntelliJ-Plugin der Community Edition als Diffblue-Docs-Dokument." }, "deployment": { "note": "Übereinstimmung auf der About-Seite des Anbieters: \"Plus, we operate on-prem so your code stays within your own environment, never seen and never shared\", with the homepage adding that the Diffblue CLI runs locally." }, "offline": { "note": "Der Datensatz enthält keine Aussage zum Offline-Betrieb; ein On-Premise-Betrieb besagt für sich genommen nicht, dass das Produkt ohne Netzwerk funktioniert." }, "regions": { "note": "Spiegelt das bereits im Datensatz vorhandene Verfügbarkeitsfeld („global“); auf den gelesenen Seiten wurde keine regionsbezogene Dienstliste veröffentlicht." }, "api": { "note": "In diesem Durchgang wurde keine API-Referenzseite gelesen, daher wird keine API-Aussage getroffen." }, "license": { "note": "Kommerzielles Produkt; auf den gelesenen Seiten ist keine Quellcode-Lizenz veröffentlicht." }, "commercial_use": { "note": "Kommerzielles Produkt; die Community Edition wird als für kommerzielle Organisationen nutzbar beschrieben, doch eine ausdrückliche kommerzielle Nutzungsgenehmigung wurde nicht gelesen." }, "billing": { "note": "Die Preisseite des Anbieters veröffentlicht nutzungsbasierte Preise nach netto neuen Coverage-Zeilen und nennt Enterprise-Pakete auf Anfrage; es gibt eine kostenlose Community Edition, aber die beiden Stufen teilen keinen vergleichbaren paid_from-Wert, daher ist keiner gesetzt." }, "languages": { "note": "Keine in diesem Durchgang gelesene Anbieterseite nennt die eigenen Oberflächensprachen des Produkts; der Schlüssel existiert, damit das Feld später beantwortet werden kann, statt leer zu bleiben." } } }, "pt": { "description": "Geração autônoma de testes unitários Java: o Diffblue Cover escreve, mantém e repara testes com um motor determinístico de aprendizado por reforço que roda no ambiente do cliente.", "overview": "A Diffblue Limited é uma cisão do grupo de pesquisa em IA da Universidade de Oxford, e sua própria página jurídica indica sede em 5 New Street Square, Londres EC4A 3TW, registrada na Inglaterra e no País de Gales com o número de empresa 09958102. A linha do tempo do fornecedor situa a cisão em 2016 e o lançamento do Diffblue Cover em 2020. O Cover escreve testes unitários Java de forma autônoma: a empresa afirma que seu motor de aprendizado por reforço produz testes que compilam e passam sem revisão humana linha a linha, anuncia até 250 vezes a velocidade de um desenvolvedor e vende execução on-premise para que o código nunca seja compartilhado. O empacotamento atual executa o agente de testes sobre uma plataforma de código aprovada, como GitHub Copilot CLI ou Claude Code. A limitação é o alcance de linguagens: as páginas lidas anunciam Java, e outras linguagens e integrações de agentes aparecem como em breve, não como suportadas.", "features": [ "Geração autônoma de testes unitários Java a partir de uma base de código existente", "Os testes são mantidos e atualizados conforme o código muda", "Motor determinístico de aprendizado por reforço que não usa modelo de linguagem, então os testes compilam e rodam", "Execução on-premise atrás do firewall do cliente, com implantação isolada para ambientes regulados", "Cobrança por linhas líquidas novas de cobertura, não por assento nem por chamada de API", "Roda como agente sobre uma plataforma de código aprovada, como GitHub Copilot CLI ou Claude Code" ], "use_cases": [ "Elevar a cobertura de testes unitários de uma base Java legada antes da modernização", "Adicionar testes de regressão em CI sem escrever cada caso à mão", "Manter o código-fonte fora de provedores externos de modelos em projetos regulados ou isolados" ], "pricing_notes": "O preço é baseado em resultado, não em assentos: o pacote inicial publicado são $1.500 por 5.000 linhas líquidas novas de cobertura, $0,30 por linha, e os pacotes corporativos são por orçamento. O Cover Community Edition é uma edição gratuita, para uso open source e comercial.", "faq": [ { "q": "O que é o Diffblue Cover?", "a": "É uma ferramenta de IA para Java que gera testes unitários automaticamente: lê a base de código, escreve testes que compilam e passam e os mantém conforme o código muda." }, { "q": "Onde a Diffblue está sediada?", "a": "A própria página jurídica da Diffblue Limited indica sede em 5 New Street Square, Londres EC4A 3TW, e o número de empresa 09958102, registrada na Inglaterra e no País de Gales." }, { "q": "O Diffblue Cover usa um modelo de linguagem?", "a": "O fornecedor o diferencia dos assistentes baseados em modelos de linguagem: afirma que o gerador usa aprendizado por reforço em vez de um modelo de linguagem, de modo que os testes são determinísticos e ele pode rodar on-premise sem enviar código a terceiros." }, { "q": "O que este registro não estabelece?", "a": "As páginas lidas não informam termos de licença, os idiomas de interface do próprio produto nem integrações além das que o fornecedor nomeia, portanto esses campos seguem não confirmados." } ], "facts": { "diffblue.hq.registered-office": { "conditions": "Conforme indicado em diffblue.com/legal and diffblue.com/privacy em 2026-10-12", "note": "Correspondência na página legal do fornecedor: \"We are Diffblue Limited … a company registered in England and Wales number 09958102, VAT number GB 233910133, with our registered office at Diffblue Limited, 5 New Street Square, London, EC4A 3TW.\" The privacy policy repeats the same registered office." } }, "selection_evidence": { "tasks": { "note": "Derivado do registro: o produto escreve e mantém código de teste, em vez de revisá-lo ou explicá-lo." }, "form_factor": { "note": "A página inicial consultada afirma «Diffblue CLI runs locally», então a CLI é a forma única mais próxima, embora existam também plugins de IDE e um agente." }, "platforms": { "note": "Derivado das páginas consultadas: a página inicial descreve uma CLI local, e o artigo da Wikipédia consultado nomeia o plugin IntelliJ da Community Edition como documento do Diffblue Docs." }, "deployment": { "note": "Correspondência na página \"sobre\" do fornecedor: \"Plus, we operate on-prem so your code stays within your own environment, never seen and never shared\", with the homepage adding that the Diffblue CLI runs locally." }, "offline": { "note": "O registro não contém nenhuma afirmação de funcionamento offline; a operação on-premise não indica por si só que o produto funciona sem rede." }, "regions": { "note": "Espelha o campo de disponibilidade já presente no registro («global»); nenhuma lista de serviços por região foi publicada nas páginas consultadas." }, "api": { "note": "Nesta passagem nenhuma página de referência da API foi lida, portanto não se faz nenhuma afirmação sobre a API." }, "license": { "note": "Produto comercial; nenhuma licença do código-fonte é publicada nas páginas consultadas." }, "commercial_use": { "note": "Produto comercial; a Community Edition é descrita como utilizável por organizações comerciais, mas nenhuma concessão explícita de uso comercial foi lida." }, "billing": { "note": "A página de preços do fornecedor publica preços por uso conforme linhas líquidas novas de cobertura e cota pacotes empresariais; existe uma Community Edition gratuita, mas os dois níveis não compartilham um valor paid_from comparável, então nenhum é definido." }, "languages": { "note": "Nenhuma página do fornecedor lida nesta passagem indica os idiomas de interface do próprio produto; a chave existe para que o campo possa ser respondido mais tarde em vez de ficar ausente." } } }, "ko": { "description": "Java용 자율 유닛 테스트 생성. Diffblue Cover는 결정적 강화학습 엔진으로 테스트를 작성·유지·수정하며 고객 자체 환경에서 실행됩니다.", "overview": "Diffblue Limited는 옥스퍼드 대학 AI 연구 그룹에서 분사한 회사로, 자사 법률 페이지에 등록 사무소를 5 New Street Square, London EC4A 3TW로 밝히고 잉글랜드와 웨일스에 회사 번호 09958102로 등록되어 있습니다. 벤더의 연혁은 분사를 2016년, Diffblue Cover 출시를 2020년으로 기록합니다. Cover는 Java 유닛 테스트를 자율적으로 작성합니다. 회사에 따르면 강화학습 엔진이 만든 테스트는 컴파일과 실행이 보장되고 사람이 한 줄씩 검토할 필요가 없으며, 속도는 개발자의 최대 250배로 광고되고, 온프레미스 실행으로 코드가 외부에 공유되지 않습니다. 현재 제공 형태는 GitHub Copilot CLI나 Claude Code 같은 승인된 코딩 플랫폼 위에서 테스트 에이전트를 실행하는 것입니다. 제약은 언어 범위로, 이번에 읽은 페이지가 내세우는 것은 Java이며 다른 언어와 에이전트 연동은 지원이 아니라 출시 예정으로 표시되어 있습니다.", "features": [ "기존 코드베이스에서 Java 유닛 테스트를 자율 생성", "코드 변경에 맞춰 테스트를 지속적으로 유지·갱신", "대규모 언어 모델을 쓰지 않는 결정적 강화학습 엔진으로 생성 테스트가 컴파일·실행됨", "고객 방화벽 내 온프레미스 실행, 규제 환경을 위한 에어갭 배포 지원", "좌석이나 API 호출이 아니라 순증 커버리지 라인 기준 과금", "GitHub Copilot CLI나 Claude Code 같은 승인된 코딩 플랫폼 위에서 에이전트로 동작" ], "use_cases": [ "레거시 Java 코드베이스의 유닛 테스트 커버리지를 현대화 전에 높이기", "각 케이스를 직접 작성하지 않고 CI에 회귀 테스트 추가하기", "규제 대상 또는 에어갭 프로젝트에서 소스 코드를 외부 모델 제공자에게 넘기지 않기" ], "pricing_notes": "요금은 좌석이 아니라 성과 기준입니다. 공개된 스타터 패키지는 순증 커버리지 5,000라인에 1,500달러, 라인당 실질 0.30달러이며 엔터프라이즈 패키지는 견적 기반입니다. Cover Community Edition은 오픈소스와 상업적 사용 모두 가능한 무료 버전입니다.", "faq": [ { "q": "Diffblue Cover는 무엇인가요?", "a": "Java용 AI 도구로 유닛 테스트를 자동 생성합니다. 코드베이스를 읽고 컴파일과 실행이 통과하는 테스트를 작성하며 코드가 바뀌면 유지합니다." }, { "q": "Diffblue는 어디에 기반을 두나요?", "a": "Diffblue Limited의 법률 페이지에는 등록 사무소가 5 New Street Square, London EC4A 3TW이고 회사 번호 09958102로 잉글랜드와 웨일스에 등록되었다고 적혀 있습니다." }, { "q": "Diffblue Cover는 대규모 언어 모델을 쓰나요?", "a": "벤더는 대규모 언어 모델 기반 어시스턴트와 구분합니다. 생성기가 대규모 언어 모델이 아니라 강화학습을 사용하므로 테스트가 결정적이고, 코드를 제3자에게 보내지 않고 온프레미스에서 실행할 수 있다고 밝힙니다." }, { "q": "이 기록이 확립하지 않는 것은?", "a": "이번에 읽은 페이지에는 라이선스 조건, 제품 자체의 인터페이스 언어, 벤더가 언급한 것 외의 연동 지원이 적혀 있지 않아 해당 항목은 확인되지 않은 상태입니다." } ], "facts": { "diffblue.hq.registered-office": { "conditions": "diffblue.com/legal and diffblue.com/privacy의 2026-10-12 기준 기재에 따름", "note": "공급업체 법률 페이지에서 일치: \"We are Diffblue Limited … a company registered in England and Wales number 09958102, VAT number GB 233910133, with our registered office at Diffblue Limited, 5 New Street Square, London, EC4A 3TW.\" The privacy policy repeats the same registered office." } }, "selection_evidence": { "tasks": { "note": "레코드에서 도출했습니다. 이 제품은 코드를 검토하거나 설명하기보다 테스트 코드를 작성하고 유지합니다." }, "form_factor": { "note": "확인한 홈페이지에는 “Diffblue CLI runs locally”라고 적혀 있어, IDE 플러그인과 에이전트도 존재하지만 CLI가 가장 근접한 단일 형태입니다." }, "platforms": { "note": "확인한 페이지에서 도출했습니다. 홈페이지는 로컬 CLI를 설명하고 있으며, 확인한 위키백과 문서는 Community Edition IntelliJ 플러그인을 Diffblue Docs 문서로 언급합니다." }, "deployment": { "note": "벤더의 소개 페이지에서 일치: \"Plus, we operate on-prem so your code stays within your own environment, never seen and never shared\", with the homepage adding that the Diffblue CLI runs locally." }, "offline": { "note": "레코드에는 오프라인 작동에 관한 주장이 없습니다. 온프레미스 운영 자체가 네트워크 없이 작동한다는 것을 뜻하지는 않습니다." }, "regions": { "note": "레코드에 이미 있는 가용성 필드(“global”)와 일치합니다. 확인한 페이지에 지역별 서비스 목록은 공개되어 있지 않았습니다." }, "api": { "note": "이번 확인에서는 API 레퍼런스 페이지를 읽지 않았으므로 API 관련 주장을 하지 않습니다." }, "license": { "note": "상업용 제품이며, 확인한 페이지에 소스 라이선스가 공개되어 있지 않습니다." }, "commercial_use": { "note": "상업용 제품입니다. Community Edition은 상업 조직이 사용할 수 있다고 설명되어 있지만, 명시적인 상업적 사용 허가는 확인하지 못했습니다." }, "billing": { "note": "벤더 가격 페이지는 순증 커버리지 라인 기준 사용량 요금제를 공개하고 엔터프라이즈 패키지는 견적 방식입니다. 무료 Community Edition이 있지만 두 등급이 비교 가능한 paid_from 값을 공유하지 않아 설정하지 않았습니다." }, "languages": { "note": "이번 확인에서 읽은 어떤 벤더 페이지에도 제품 자체의 인터페이스 언어가 명시되어 있지 않습니다. 이 키는 필드를 비워 두지 않고 나중에 답할 수 있도록 존재합니다." } } } }, "sources": [ { "title": "Diffblue — AI Testing Agent for Enterprise Unit Testing", "url": "https://www.diffblue.com/" }, { "title": "About Diffblue (history and technology)", "url": "https://www.diffblue.com/about/" }, { "title": "Diffblue pricing", "url": "https://www.diffblue.com/pricing/" }, { "title": "Legal — Diffblue Limited registered office", "url": "https://www.diffblue.com/legal/" }, { "title": "Privacy — Diffblue Limited", "url": "https://www.diffblue.com/privacy/" }, { "title": "Diffblue raises $6.3M for autonomous AI-powered test generation platform (SiliconANGLE)", "url": "https://siliconangle.com/2024/10/30/diffblue-raises-6-3m-autonomous-ai-powered-test-generation-platform/" }, { "title": "Diffblue (Wikipedia)", "url": "https://en.wikipedia.org/wiki/Diffblue" } ], "facts": [ { "id": "diffblue.hq.registered-office", "field": "hq_country", "value": "GB", "conditions": "As stated on diffblue.com/legal and diffblue.com/privacy on 2026-10-12", "sources": [ "https://www.diffblue.com/legal/" ], "checked": "2026-10-12", "evidence_type": "official_page", "status": "verified", "note": "Matched on the vendor legal page: \"We are Diffblue Limited … a company registered in England and Wales number 09958102, VAT number GB 233910133, with our registered office at Diffblue Limited, 5 New Street Square, London, EC4A 3TW.\" The privacy policy repeats the same registered office." } ], "updated": "2026-10-12", "selection": { "tasks": [ "code-writing", "code-editing" ], "form_factor": "cli", "platforms": [ "jetbrains", "terminal" ], "deployment": [ "self-hosted", "local" ], "offline": "unknown", "regions": [ "global" ], "api": "unknown", "license": "proprietary", "commercial_use": "unknown", "billing": { "models": [ "usage", "enterprise-quote" ], "free_allowance": "limited", "requires_subscription": "no" }, "languages": [ "unknown" ] }, "selection_evidence": { "tasks": { "status": "editorial_inference", "note": "Derived from the record: the product writes and maintains test code rather than reviewing or explaining it." }, "form_factor": { "status": "editorial_inference", "note": "The homepage read says \"Diffblue CLI runs locally\", so the CLI is the closest single form factor, although IDE plugins and an agent exist." }, "platforms": { "status": "editorial_inference", "note": "Derived from the pages read: the homepage describes a local CLI, and the Community Edition IntelliJ plugin is named as a Diffblue Docs document in the Wikipedia article read." }, "deployment": { "status": "verified", "source": "https://www.diffblue.com/about/", "checked": "2026-10-12", "basis": "official_page", "note": "Matched on the vendor about page: \"Plus, we operate on-prem so your code stays within your own environment, never seen and never shared\", with the homepage adding that the Diffblue CLI runs locally." }, "offline": { "status": "editorial_inference", "note": "The record contains no offline-operation claim; on-premise operation does not by itself state that the product works without a network." }, "regions": { "status": "editorial_inference", "note": "Mirrors the availability field already on the record (\"global\"); no per-region service list was published on the pages read." }, "api": { "status": "unknown", "note": "No API reference page was read in this pass, so no API claim is made." }, "license": { "status": "editorial_inference", "note": "Commercial product; no source licence is published on the pages read." }, "commercial_use": { "status": "editorial_inference", "note": "Commercial product; the Community Edition is described as usable by commercial organisations, but no explicit commercial-use grant was read." }, "billing": { "status": "editorial_inference", "note": "The vendor pricing page publishes usage-based pricing by net new line of coverage and quotes enterprise packages; a free Community Edition exists, but the two tiers do not share a comparable paid_from figure, so none is set." }, "languages": { "status": "unknown", "note": "No vendor page read in this pass states the product's own interface languages; the key exists so the field can be answered later rather than left absent." } }, "verification": { "last_checked": "2026-10-12", "batch": "cp18", "channel": "Page text was read this session with the available read-only page-extraction tool (tavily_extract), which returned the body of every URL listed under sources[]; the design-canvas browser was retried once this session and again returned session_not_registered, so the designated browser channel was substituted (see docs/coverage-memoranda/non-us-coverage.md §8.1).", "pages": [ { "url": "https://www.diffblue.com/", "status": 200, "fetched_at": "2026-10-12T04:36:00.000Z" }, { "url": "https://www.diffblue.com/about/", "status": 200, "fetched_at": "2026-10-12T04:36:00.000Z" }, { "url": "https://www.diffblue.com/pricing/", "status": 200, "fetched_at": "2026-10-12T04:36:00.000Z" }, { "url": "https://www.diffblue.com/legal/", "status": 200, "fetched_at": "2026-10-12T04:36:00.000Z" }, { "url": "https://www.diffblue.com/privacy/", "status": 200, "fetched_at": "2026-10-12T04:36:00.000Z" }, { "url": "https://siliconangle.com/2024/10/30/diffblue-raises-6-3m-autonomous-ai-powered-test-generation-platform/", "status": 200, "fetched_at": "2026-10-12T04:39:00.000Z" }, { "url": "https://en.wikipedia.org/wiki/Diffblue", "status": 200, "fetched_at": "2026-10-12T04:39:00.000Z" } ], "unreachable": [ "https://www.diffblue.com/docs/" ], "confirmed_fields": [ "deployment" ], "gaps": [ "api", "license", "languages", "offline", "regions" ], "unconfirmed_fields": [ "tasks", "form_factor", "platforms", "offline", "regions", "api", "license", "commercial_use", "languages" ], "gap_note": "These fields had no supporting statement on the vendor pages fetched on this date; they keep their inferred or unknown status rather than being presented as confirmed." }, "url": "https://globalaiproductindex.com/products/diffblue/" }