Stims — Open Source Productivity App

Stims lets you select apps that should prevent your screen from turning off. When a stimmed app is active in the foreground, the screen stays on at full brightness. When you switch to a different app, the screen resumes normal sleep behavior. Select apps to stim from the list, tap "Stim Selected Apps", and a background service will monitor the foreground app and hold a wake lock whenever one of your chosen apps is active. Requires Usage Access permission to detect which app is in the foreground.