Codecov
Test coverage reports on pull requests.
ServiceFreemium
Service that receives test coverage from CI and shows it in PR comments and dashboards, pointing out what was left untested.
When to use
To track test coverage and block PRs that reduce it.
When to avoid
If coverage isn't a relevant metric for the team; high numbers don't guarantee good tests.
Related
From the same area, with a close purpose.
Visual testing and UI review from Storybook.
ServiceFreemium