Every feature earns its place
Kalaku does a few things and does them ruthlessly well. No bloat, no feed, no distractions.
The interrupt is the whole idea
Most timers politely chime and hope you notice. Kalaku posts a full-screen-intent notification that launches a takeover screen the instant your rest ends — visible over the lock screen, backed by vibration. You physically cannot keep scrolling. That single design choice is why people actually finish their workouts.
Interrupting rest timer
Foreground service keeps counting through screen-off and app-switching. Fires a full-screen interrupt + vibration at zero.
Plate calculator
Enter a target weight, get the exact plate loadout per side. Powered by a native C++ engine for instant, exact math.
Set logging
Capture what you lifted and review your progress over time.
Dark, gym-ready UI
Built with Material 3 in a high-contrast dark theme that reads at a glance under gym lights.
No account, no ads
Nothing to sign up for. Nothing selling your attention back to the scroll.
Android, lightweight
Small, fast install. Runs great on modern Android phones (Android 8.0+).