This app was mentioned in 2 comments, with an average of 1.50 upvotes
They had my one on there too at ~6 seconds on the guy in yellow on the left :D ( https://play.google.com/store/apps/details?id=com.rorywebdev.watch.level )
This: https://play.google.com/store/apps/details?id=com.rorywebdev.watch.level