Jacoco works on bytecode level, so should have no problems with any JVM language. If you are Android dev by any chance: Here is an app written in Kotlin by @jozzi and 3 other interns I had a chance to work with: https://github.com/elpassion/cloud-timer-android And jacoco reports uploaded to coveralls: https://coveralls.io/github/elpassion/cloud-timer-android