To know more about Pomodoro Technique:
The app is FOSS, released under the Apache 2.0 license. You can found the sources at https://github.com/danybony/wear-pomodoro
-Pair your device with watch.
-Install the application
-Run the app from your watch with OK Google... start Tomato
Note: you will NOT find an icon on your smartphone launcher. The app is installed directly on the watch once it is paired with the phone.