RoundClock: HIIT & Tabata
Interval Timer for Workouts
Only for iPhone
Free · In‑App Purchases
iPhone
HIIT, Tabata, Boxing, CrossFit — runs in background even with screen off.
Voice cues, custom workouts, Lock Screen Live Activity. 100% offline.
Lifetime purchase availab…
The fastest interval timer for HIIT, Tabata, Boxing, and CrossFit.
Runs in background — even with screen off. Voice cues, custom workouts,
Lock Screen Live Activity. 100% offline. Lifetime purchase available.
WHAT YOU CAN DO
• FOUR PRESETS, ONE TAP
Tabata (20s work / 10s rest × 8), Boxing (3min / 1min × 12), HIIT
(45s / 15s × 10), and a Custom Workout builder. Tap and start training
in three seconds — no setup, no account.
• RUNS IN BACKGROUND
Lock the screen, switch apps, take a call — your timer keeps ringing on
schedule. Works through Silent Mode, plays cues on AirPods and Bluetooth
speakers, and never stops mid-round.
• VOICE CUES
Hear "Work!", "Rest!", "Round 3", "Final round" through your headphones.
No need to look at the phone — keep your eyes on form, not the screen.
• BIG NUMBERS, BOLD COLORS
200pt countdown digits at the center of the screen. Red for work, green
for rest, yellow for get-ready. Phone on the floor next to the dumbbells?
You can still read it from a plank.
• CUSTOM WORKOUTS
Vertical-scroll wheel pickers for time and rounds — works fine with sweaty
hands. Save unlimited workouts, name each interval ("Push-ups", "Squats",
"Burpees"), build multi-stage routines.
• LIVE ACTIVITY + DYNAMIC ISLAND
Lock Screen shows the current interval, round number, and seconds
remaining. Dynamic Island keeps the timer visible while you switch apps
or check Spotify mid-workout.
• HISTORY & STATS
Every completed session is logged automatically. Weekly and monthly
charts show total time, rounds, and streaks.
PRIVACY FIRST
Everything happens on your iPhone. No accounts. No analytics. No ads.
No third-party SDKs. Your workout data never leaves your device.
3-day free trial, then $1.99/week. Monthly, yearly, or lifetime options
available. Lifetime is a one-time purchase, no renewal.
Terms of Use: https://taxlite.net/round_clock/terms.html
Privacy Policy: https://taxlite.net/round_clock/privacy.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Welcome to RoundClock!
• 4 presets ready in one tap — Tabata, Boxing, HIIT, Custom
• Runs in background, even with screen off
• Voice cues for Work, Rest, and round announcements
• Custom multi-stage workouts with named intervals
• Live Activity on Lock Screen and Dynamic Island
• 100% offline — no account, no data collection, no ads
• Now in German, French, Japanese, Korean and Simplified Chinese.
• Fixed dark-mode contrast on workout cards and round counts.
• Fixed paywall reappearing after a successful subscription.
Start with a 3-day free trial.
The developer, ZHENGQIAO JIANG, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- ZHENGQIAO JIANG
- Size
- 2.2 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18 or later.
- iPhone
Requires iOS 18 or later.
- iPhone
- Languages
English and 4 more
- English, French, German, Japanese, Korean
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Weekly $1.99
- Yearly $29.99
- Monthly $4.99
- Lifetime $79.99
- Copyright
- © Alex Jiang 2026