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What is Codecov?

Our patrons rave about our elegant coverage reports, integrated pull request comments, interactive commit graphs, our Chrome plugin and security.

What is Coveralls?

Coveralls works with your CI server and sifts through your coverage data to find issues you didn't even know you had before they become a problem. Free for open source, pro accounts for private repos, instant sign up with GitHub OAuth.

What is uberalls?

Code coverage metric storage service. Provide coverage metrics on differentials with Phabricator and Jenkins, just like Coveralls does for GitHub and TravisCI.
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        What companies use Codecov?
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        What are some alternatives to Codecov, Coveralls, and uberalls?
        Code Climate
        After each Git push, Code Climate analyzes your code for complexity, duplication, and common smells to determine changes in quality and surface technical debt hotspots.
        SonarQube provides an overview of the overall health of your source code and even more importantly, it highlights issues found on new code. With a Quality Gate set on your project, you will simply fix the Leak and start mechanically improving.
        Codacy automates code review to improve & standardize code quality across large enterprises. It identifies issues through static code analysis. Integrates with GitLab, GitHub & Bitbucket. Supports 30+ languages
        See all alternatives
        Decisions about Codecov, Coveralls, and uberalls
        Tim Abbott
        Tim Abbott
        Founder at Zulip | 4 upvotes 35.5K views

        We use Codecov because it's a lot better than Coveralls. Both of them provide the useful feature of having nice web-accessible reports of which files have what level of test coverage (though every coverage tool produces reasonably nice HTML in a directory on the local filesystem), and can report on PRs cases where significant new code was added without test coverage.

        That said, I'm pretty unhappy with both of them for our use case. The fundamental problem with both of them is that they don't handle the ~1% probability situations with missing data due to networking flakiness well. The reason I think our use case is relevant is that we submit coverage data from multiple jobs (one that runs our frontend test suite and another that runs our backend test suite), and the coverage provider is responsible for combining that data together.

        I think the problem is if a test suite runs successfully but due to some operational/networking error between Travis/CircleCI and Codecov the coverage data for part of the codebase doesn't get submitted, Codecov will report a huge coverage drop in a way that is very confusing for our contributors (because they experience it as "why did the coverage drop 12%, all I did was added a test").

        We migrated from Coveralls to Codecov because empirically this sort of breakage happened 10x less on Codecov, but it still happens way more often than I'd like.

        I wish they put more effort in their retry mechanism and/or providing clearer debugging information (E.g. a big "Missing data" banner) so that one didn't need to be specifically told to ignore Codecov/Coveralls when it reports a giant coverage drop.

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        How developers use Codecov, Coveralls, and uberalls
        Avatar of OnlineCity
        OnlineCity uses CoverallsCoveralls

        Code Coverage is an important metric for us as we aim to deliver regular improvements to our platform.

        Avatar of Sascha Manns
        Sascha Manns uses CoverallsCoveralls

        Coveralls helps me to detect holes inside my testing space.

        Avatar of Dieter Adriaenssens
        Dieter Adriaenssens uses CoverallsCoveralls

        publishes test coverage reports

        Avatar of malcolmgreaves
        malcolmgreaves uses CoverallsCoveralls

        Code coverage and review

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