HIIT Timer — 45/15
8 rounds · 45s work / 15s rest · 8m — a real, working hiit timer right in your browser. Big color-coded phases, beeps, and the screen stays awake. Free, no sign-up.
Get Ready
0:10
Next: Work · 0:45
8:10 left
Palette
Space start / pause R reset M mute F fullscreen
How it works
The HIIT protocol
Forty-five on, fifteen off — a 3:1 ratio for conditioning when you can hold form under fatigue.
- 45 seconds of hard work
- 15 seconds of active or full rest
- Repeat for 8 rounds
- Mix movements or hold one — the timer just keeps the intervals honest
Work
45s
Rest
15s
Rounds
8
Total
8m
The Pulse app
Love these colors? There are 134 more.
This free timer is a taste of Pulse for iPhone & Apple Watch. The app has 136 searchable palettes, a full color picker, saved custom timers, big glanceable numbers, and your music keeps playing underneath. $3.99 once — no subscription, no ads, ever.
136 palettesEight free, 136 total — searchable, plus a full color picker to match your vibe.
Apple WatchStart any saved timer from your wrist with a haptic tap at every transition.
Live ActivityLock-Screen countdown + Dynamic Island pill keep ticking while you use other apps.
$3.99 onceOne payment unlocks everything. No subscription. No auto-renew. No ads.
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