Chrono: Interval Timer & Lap

Chrono is an interval timer and stopwatch built around one idea: a timer should read the clock, not count its own ticks. A twenty-minute session is twenty minutes, to the millisecond, even if the app is paused and resumed halfway through.

Everything runs offline on your device. There is no account, no sign-up, no ads, and the app requests zero Android permissions.

WHAT YOU GET

• A countdown that stays honest
Elapsed time comes from the system clock, so a dropped frame or a moment in the background costs nothing. Every finished session reports its measured drift.

• Interval workouts you can actually read
Build a sequence of prepare, work, rest, long rest and cool down. The whole thing is drawn as one colour-coded bar, so you can see the shape of the session before you start. Tabata, HIIT, EMOM, Pomodoro, stretch holds and boxing rounds are included.

• A stopwatch with lap analysis
Tenths of a second, a lap list with signed deltas, and a chart showing the fastest and slowest lap and how tight your spread was.

• History that is worth keeping
A thirty-day heat map of when you actually use it, every finished session, and a breakdown of each one segment by segment.

• Clear cues without a notification
The ring, the colour and a synthesised tone tell you what is happening. The screen stays awake for the length of a session.

• Eight background themes
A full Appearance section with eight crafted backgrounds and a modern, animated navigation bar.

PRIVACY FIRST
Chrono collects nothing. There is no account and no internet connection — your workouts and history stay in local storage on your device. Zero permissions requested, which also means it cannot notify you or vibrate: the timer runs while Chrono is open.

WHO IT IS FOR
Anyone doing interval work — training, stretching, practising, studying, cooking, or anything else that is easier when something else counts.