Use APKPure App
Get Custom Interval Timer old version APK for Android
Zbuduj swój własny zegar!
Build your own timer!
It is easy to use weightlifting, crossfit training, HIIT, tabata, round timer, running, sports, kitchen timer.. etc
This app has a simple interface.
Apache 2.0 License
http://www.apache.org/licenses/LICENSE-2.0.html