undercover

Warns about methods, classes, and blocks changed without tests, by analyzing git diffs against coverage reports.

Desktopfreemiumglobal

A command-line and CI-capable tool for Ruby that analyzes git diffs alongside SimpleCov reports to flag methods, classes, or code blocks changed in a commit that lack test coverage. Undercover is intended for Ruby engineering teams and reviewers who want automated, diff-aware coverage checks; it can run locally or in CI as a CLI or GitHub App and is available under the MIT license.

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Full match profile

Behind the summary, Matchbox keeps a richer profile of undercover - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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