Automation process is awesome when we write a new code and don't add test case it show how test are important for that new code and overall coverage. We can check it's essential to write test first for that code or we can hot fix without test. It's Free for open source projects is pretty cool.

The best of this service is it's great docs and nice FAQ. The other nice thing is that you can try it for free. Just follow the instructions in the docs and they will get you for your first configuration. You can easily find parts that are uncovered and fix it. Great integration with popular CI services with "Easy Way" configs in docs. Coveralls can be used as required check for GitHub and BitBucket. Free for Open Source projects. Free 30 days trial for one private repo.

Code coverage is one of the pillars of Continuous Integration and Continuous Deployment. It helps you grasp which parts of an application are not well tested. Coveralls helps you with this in addition to tracking code coverage over time. Coveralls is able to do this by collecting code coverage data of an application and analyse them to find issues that otherwise you will not see until they become a problem. Coveralls exposes a summary of these data in a simple interface With whom you can see trends and changes on coverage for all the source files of the application. Furthermore, it supports a plethora of programming languages (e.g. Java, C/C++, Go, Javascript, Python, etc.) In addition, it is super easy to setup especially if you're using platforms like Github, Bitbucket or Gitlab. And it's free for open source repositories.