Circuit Timer — 30/15
12 stations · 30s work / 15s transition. Runs in the browser with color-coded phases and beeps; the screen stays on. Free, no sign-up.
Get Ready
0:10
Next: Work · 0:30
9:10 left
Palette
Space start / pause R reset M mute F fullscreen
How it works
Twelve quick stations of 30 on, 15 off — a fast-moving circuit that keeps the heart rate up.
- 30 seconds at each station
- 15 seconds to move to the next
- 12 stations
- Lay out your stations first, then let the timer drive the rotation
Work
30s
Switch
15s
Stations
12
Total
9m
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.
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Circuit Timer
10 stations · 45s work / 15s transition
Circuit Timer — 30/30
10 stations · 30s work / 30s transition
Circuit Timer — 40/20
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Circuit Timer — 60/15
12 stations · 60s work / 15s transition
Circuit Timer — 50/10
10 stations · 50s work / 10s transition
Tabata Timer
8 rounds · 20s work / 10s rest · 4 min