Timer builder
Name your intervals, set the repeats, and share the result. Anyone who scans the code gets the timer loaded in TimerNinja, or as an App Clip if they have never installed it. Saved timers stay in this browser.
Work/rest rounds. The safe default for anything with a rhythm.
Drag the dots to reorder, including in and out of repeat blocks. Durations take 90, 1:30 or 1m30s.