No, the iPhone does not have a Tabata timer. iOS gives you the Clock app for countdowns and alarms and the Fitness app for activity tracking, and none of that will alternate 20 seconds of work with 10 seconds of rest, eight times over, without you touching the screen.
You can get close with the built-in Clock by restarting a saved timer at every changeover. That works, in the sense that a stopwatch and a whiteboard also work. It is the reason a whole category of third-party interval timers exists on the App Store.
What the Clock app actually does
The Clock app covers four things: World Clock, Alarm, Stopwatch and Timers. Since iOS 17 you can run several timers at once, label them and save them for reuse, which is a real improvement over the single-timer years.
A Clock timer still fires once and stops. There is no repeat setting, no second duration for the rest phase, no round counter. Alarms do repeat, but they repeat on a daily schedule, not every 20 seconds. The parts you need for interval training are simply not there.
A full Tabata set is eight rounds of 20 seconds hard and 10 seconds easy, so it needs 16 consecutive countdowns. Two saved timers and a lot of tapping will get you through it. So will setting several timers at staggered lengths, 30 seconds, 50 seconds, 80 seconds and so on, so each one lands on a changeover, though you then have to dismiss each alert as it arrives. Either way you spend the workout managing your phone instead of moving.
Is there an interval timer on an iPhone?
Not on the iPhone by itself. The nearest thing Apple ships is on the watch: the Workout app has Custom Workouts, added in watchOS 9, where you build a warm-up, alternating work and recovery intervals, a repeat count and a cool-down. The watch taps your wrist and plays a tone at every change, and it tracks heart rate through the session.
That is a genuine interval timer with two caveats. It needs an Apple Watch, and its structure is aimed at pace, distance and heart rate targets for running and cycling, so short bodyweight circuits fit it awkwardly.
The three ways to run Tabata on an iPhone
| Method | Repeats automatically | Audio cue before each change | Works with the screen locked | Hands-free |
|---|---|---|---|---|
| Clock app timers | No | No, one alert at zero | The alert fires, then you restart it by hand | No |
| Apple Watch Custom Workout | Yes | Tone and haptic tap at each change | Yes, on your wrist | Yes |
| Dedicated interval timer app | Yes | Yes, usually a three or five second countdown | Yes, when it is built correctly | Yes |
The last column is the one that decides whether a session feels like training or like admin. A timer you have to watch is a timer that owns your eyes during the exact 20 seconds you are meant to be working at full effort.
Is there a timer app that goes off at intervals?
Yes, and the App Store category is crowded. Searching for a Tabata timer app for iPhone returns dozens, from single-purpose Tabata clocks to configurable circuit builders. Most are free to start with paid tiers for extras such as unlimited saved workouts or custom sounds.
The features worth checking before you settle on one:
- Separate phases. Prepare, work, rest, rounds, sets and cool-down, each editable, so a 40/20 EMOM and a 20/10 Tabata both fit.
- A cue before the change, not on it. Three beeps at three, two, one give you time to reset your feet. A single tone at zero is information you needed a moment ago.
- Spoken round numbers. Knowing you are on round six without looking is the difference between finishing eight and finishing five.
- Music that ducks rather than stops. The cue should dip your playlist for a second and let it come back.
- Correct behaviour when the phone locks. This is where most of them quietly fail, and it deserves its own explanation.
Why iPhone interval timers drift
iOS suspends apps not long after the screen locks or you switch away. The app stops receiving CPU time. Anything inside it that was advancing by being ticked, a counter incremented 60 times a second, stops advancing too, and when the app wakes it carries on from wherever it froze. Come back after two minutes in your pocket and the timer is two minutes behind the world.
The fix is to stop counting. A correct implementation records the instant you pressed start, then answers every question by subtracting that instant from the current wall-clock time. Which phase am I in, how many seconds are left, which round is this: all of it is arithmetic on elapsed real time, so it stays right no matter how long the app was frozen. Audio cues are scheduled ahead of time against that same timeline, and the app holds an audio session so the sounds still play with the screen off.
Rounds is built this way, with the whole workout expanded into a phase timeline the moment you hit start, so locking the phone mid-round changes nothing about what comes out of the speaker.
The Lock Screen side is handled by Live Activities, available since iOS 16.1. A Live Activity hands the system a start and end date and lets it render the countdown itself, which is why the numbers keep ticking on the Lock Screen and in the Dynamic Island while the app sits idle. From iOS 26, apps can also use AlarmKit to post countdowns and alarms that cut through silent mode and Focus, so a rest cue reaches you even with the ringer off.
Setting up intervals with what you already have
If you want to train right now with nothing installed, here is the honest version of the Clock method:
- Open Clock, go to Timers, set 20 seconds, choose a loud alert sound and save it as a preset labelled Work.
- Set a second timer at 10 seconds, save it as Rest.
- Start Work. When it fires, dismiss it and start Rest. When that fires, dismiss it and start Work again.
- Count your own rounds. Stop after eight.
Four minutes of training, 16 taps, and no way to stop watching the screen. It is a fair stopgap and a poor habit.
What the protocol actually asks for
The precision matters because of where the format came from. Izumi Tabata and colleagues published the original study in 1996 in Medicine and Science in Sports and Exercise, testing cyclists on ergometers. The intermittent group did 20 seconds at roughly 170% of VO2 max followed by 10 seconds of rest, seven to eight sets, five days a week for six weeks. A comparison group cycled for an hour at 70% of VO2 max. The intermittent group improved both aerobic and anaerobic capacity, while the steady-state group improved aerobic capacity only.
The whole effect depends on those 20 seconds being maximal. Every second you spend glancing at a countdown, or tapping restart, is a second not spent at that intensity, which is exactly the cost of making the Clock app do a job it was never designed for.
So: the iPhone has excellent timers and no interval timer. Apple Watch owners get repeating intervals in the Workout app, everyone else needs a third-party app, and the one to pick is the one that computes from the wall clock, warns you before each change and stays correct in your pocket. Rounds is in open beta through TestFlight if you want to try one built on exactly that principle, at userounds.app.
Common questions
Does the iPhone have a Tabata timer?
No. iOS ships with the Clock app, which runs one-shot countdowns and daily alarms, and neither of those repeats a work and rest cycle on its own. Running Tabata on a stock iPhone means restarting a timer by hand 16 times, which is why dedicated interval timer apps exist.
Is there an interval timer on an iPhone?
There is no interval timer built into iOS itself. If you own an Apple Watch, the Workout app has Custom Workouts with repeating work and recovery intervals, and that runs on your wrist rather than your phone. On the iPhone alone, interval timing comes from a third-party app.
Can you set an interval timer on iPhone with the Clock app?
You can approximate one. Save a timer at your work length and a second at your rest length, then tap between them at every changeover, or stagger several timers so they finish at the right offsets. Both approaches need your hands and your attention during the round, so they suit a single long interval far better than eight rounds of 20 seconds.
Is there a timer app that goes off at intervals?
Yes. The App Store has a whole category of interval timers that alternate work and rest automatically, count rounds and sets, and play an audio cue a few seconds before each change. Look for one that speaks or beeps a warning before the switch, since a cue that lands exactly on zero is already late.
Do interval timer apps keep running when the iPhone screen is locked?
Well-built ones do. iOS suspends apps shortly after the screen locks, so a timer that counts by ticking loses time, while a timer that calculates remaining seconds from the wall clock comes back exact. Live Activities also put the running countdown on the Lock Screen and in the Dynamic Island, so you can check progress without touching the phone.
Is there a free interval timer for iPhone?
The Clock app is free but manual, and most third-party interval timers offer a free tier with paid extras such as custom sounds or unlimited saved workouts. Apps still in open beta through TestFlight are another way to try a full-featured timer without paying for it first.