Rounds

A hands-free HIIT interval timer that runs your whole workout.

Rounds is a hands-free HIIT interval timer: set your prep, work, rest and number of rounds, hit start, and it counts down every phase with a sweeping ring, a big readout and round-by-round pips — no login, nothing leaving your browser. It remembers your last workout, sounds a cue on every transition, and works just as well on a phone propped against the wall. Built end-to-end with AI, it's a single self-contained file you can download to self-host or remix.