Slothie: an on-device Gemma 4 app that learns your risky phone hours

Slothie is an Android app that lives on your phone and identifies the hours of the day when you are most likely to use it, along with the apps involved. It analyzes Android's usage log entirely on the device, scoring each hour by how often you spent five or more minutes there, weighted by typical usage time. A few minutes before a predicted risky hour, it sends a nudge offering a one-tap Do Not Disturb period of 30 or 60 minutes. The app runs the open-weight Gemma 4 E2B model locally via LiteRT-LM to write a daily note and categorize apps, while all statistics are computed in Kotlin. The project is MIT licensed and requires no backend or accounts.