Codecov is the leading code coverage platform that shows developers exactly which lines their tests hit — and which they missed — directly inside the pull request workflow.
Codecov, now part of Sentry, plugs into any CI pipeline and merges coverage reports from every language, build, and test type into a single, comparable view. When a pull request opens, Codecov comments the coverage change, highlights uncovered lines in the diff, and can block merges that drop coverage below your standards. Features like flags and components slice coverage by feature area or folder in monorepos, carryforward flags keep flaky partial results stable, and bundle analysis extends the same visibility to frontend bundle sizes. It supports dozens of languages and uploaders and is SOC 2 Type II certified. Historical trends and per-file blame views make it easy to see where coverage is improving — or quietly eroding — over time.
Codecov is free for open-source projects. Paid plans for private repositories start at $10 per user per month, with team and enterprise tiers adding advanced reporting, priority support, and self-hosted options.
Codecov is for engineering teams that treat test coverage as a quality gate in code review: teams wanting coverage feedback inside pull requests rather than in a forgotten CI log, and organizations standardizing coverage across many repositories and languages.