HIIT Timer — 20/40
10 rounds · 20s work / 40s rest · 10m. Runs in the browser with color-coded phases and beeps; the screen stays on. Free, no sign-up.
Get Ready
0:10
Next: Work · 0:20
10:10 left
Palette
Space start / pause R reset M mute F fullscreen
How it works
Short, maximal 20-second efforts with generous 40-second recovery — a 1:2 ratio built for true sprints and power work.
- 20 seconds of hard work
- 40 seconds of active or full rest
- Repeat for 10 rounds
- Mix movements or hold one — the timer just keeps the intervals honest
Work
20s
Rest
40s
Rounds
10
Total
10m
Guide: How many rounds of HIIT? Work-to-rest ratios and rounds
Pulse for iPhone and Apple Watch
The same kind of timer as an app. Free download; Pulse Pro is $3.99 once. No subscription, no ads.
168 palettes8 free, all 168 with Pro.
Apple WatchSaved interval timers run on the watch, with a haptic at each transition.
Live ActivityThe countdown shows on the Lock Screen and in the Dynamic Island.
Saved timers3 free, unlimited with Pro. Flow sessions, labels and history.
Related timers
HIIT Timer — 60/60
10 rounds · 60s work / 60s rest · 20m
HIIT Timer — 30/10
10 rounds · 30s work / 10s rest · 6m40s
HIIT Timer — 50/10
8 rounds · 50s work / 10s rest · 8m
HIIT Timer — 60/30
8 rounds · 60s work / 30s rest · 12m
20-Minute HIIT Timer
20 rounds · 40s / 20s · 20 min
Tabata Timer
8 rounds · 20s work / 10s rest · 4 min