Mutant vs Stryker Dashboard

Mutant is Ruby mutation-testing software that changes code in controlled ways to check whether tests catch the changes. It alters arithmetic, logical and bitwise operators, removes statements, and changes return values. It works with RSpec, Minitest and Test::Unit, and supports incremental runs for CI. Supported Ruby versions are 3.2, 3.3, 3.4 and 4.0 for runtime, syntax and mutations. Rails support is verified for versions 7.2, 8.0 and 8.1, with parallel-worker database isolation for PostgreSQL and SQLite. Mutant runs on developers’ machines or in CI, and includes parallel execution and reports of surviving mutants. It cannot generate mutations for methods defined inside closures, including methods created with module_eval, class_eval, define_method or define_singleton_method. The open-source plan is free for public repositories with the full feature set. Commercial monthly pricing is $30 a month per developer; yearly pricing is $250 a year per developer. CI use requires no additional subscriptions.

Stryker Dashboard is a free, open-source web service for publishing mutation-testing reports and displaying a mutation score badge for repositories. It accepts reports from mutation-testing frameworks that follow the mutation testing report schema, with named language coverage for JavaScript, TypeScript, C#, Scala, and other compatible frameworks. Users enable a repository by signing in with GitHub. Reports can arrive through a Stryker dashboard reporter or by HTTP PUT, authenticated with an API key in STRYKER_DASHBOARD_API_KEY or the X-Api-Key header. Documentation lists full reports, mutation-score reports, and dashboard settings for Stryker, Stryker.NET, and Stryker4s. The API can group multiple reports for one version with an optional module value, useful for monorepos, or accept a score-only report for a badge without storing other report information. Automatic project and version retrieval is documented for Travis, CircleCI, and GitHub Actions across those implementations; Azure DevOps and GitLab CI are supported only for Stryker.NET. The backend currently supports github.com as its Git provider.