Does the timer work if I switch tabs?

Timing is anchored to a real moment, so it stays correct. Keep the tab open so the sound can play.

Yes. Work and rest go from 1 to 3600 seconds, with 1 to 99 rounds. For fixed presets there are separate Tabata and HIIT pages.

How do I get this on my phone?

Open the same interval timer in the NanoTimer app with the button above. There you also get voice cues and music ducking.

A free interval timer for any work-rest ratio. Set the work, rest and number of rounds and run it right in your browser, with a beep on every switch.

Work (s)Rest (s)Rounds

Work 30s · Rest 15s · 8 rounds

This tool runs in your browser. Want it on your phone, with voice cues, background timing and a real alarm? Open the same tool in NanoTimer.

Open on your phoneOpens NanoTimer on your iPhone and starts right away.

Download on theApp StoreLink coming soon

Does the timer work if I switch tabs?: Timing is anchored to a real moment, so it stays correct. Keep the tab open so the sound can play.
Can I set any ratio?: Yes. Work and rest go from 1 to 3600 seconds, with 1 to 99 rounds. For fixed presets there are separate Tabata and HIIT pages.
How do I get this on my phone?: Open the same interval timer in the NanoTimer app with the button above. There you also get voice cues and music ducking.