Coveralls is a web service designed to track the code coverage of applications, offering insights into the effectiveness of unit tests over time, particularly when used in conjunction with Continuous Integration/Continuous Deployment (CI/CD) platforms like Codefresh. It provides features for optimizing repository coverage, analyzing trends, and assessing how changes affect projects, with a pricing model that allows free access for open-source projects. Integration involves setting up a testing tool, such as Jest or Mocha, to produce coverage reports, which are then forwarded to Coveralls in an LCOV data format. Users need to configure their repositories with Coveralls to generate a secret repository token for secure report submissions. The service seamlessly connects with various git providers like GitHub, GitLab, or BitBucket, requiring users to input specific environment variables to link their testing framework to Coveralls. Additionally, once integrated into a Codefresh pipeline, Coveralls can automatically submit coverage reports with each build, enhancing the visibility of code coverage and allowing for the addition of a code coverage button to project documentation.