Caff

Caff is an open-source Android utility in the System category. It provides a Quick Settings tile for keeping the device display on for an extended period. It is intended for users who need temporary control over the display timeout without navigating through system settings.

Tapping the tile enables caffeine mode and cycles through the preset durations configured for the app. When caffeine mode is active, the tile also functions as a countdown timer. This gives the user a way to see that a timed display-on period is in progress.

Long-pressing the tile opens Caff’s preferences menu. From there, users can choose which available durations the tile cycles through. Caff also includes an infinite mode that keeps the display on indefinitely.

Caff fits Android’s System category because it works through the operating system’s Quick Settings interface. Its open-source license identifies it as software distributed under an open-source model. MirrorNest mirrors the official Android build directly on its own storage and scans it for malware before publishing. Depending on the device, battery optimizations may need to be disabled for Caff to work as intended.