The free interval timer.
Free forever.
Intervals, Tabata, EMOM, AMRAP and For time. No ads. No account needed.
Time is the unit. The timer is too.
The workout side
Kronos writes one for you in seconds, checked against a trainer’s standard.
Tell it your goal, your gear and your time. It writes the session for the slots on your timer, and runs it.
Built to a personal trainer’s standard.
Every session is checked before it reaches you, and most are ready in about five seconds.
New here? Start with The Opener, a free first week.
Five formats, one screen
Set it in seconds.
Intervals, Tabata, EMOM, AMRAP and For time share one form. Tap a number and type it: 130 is 1:30. It opens on your last timer, with your recent ones a tap away.
- Intervals
- Work, rest, intervals, rounds
- Tabata
- 20 on, 10 off, 8 rounds
- EMOM
- A new round every minute
- AMRAP
- Max rounds in a cap, tap each one
- For time
- Finish, then stop the clock
Add a warm-up and a cool-down to any of them. Save as many presets as you like, free.
What it does without asking
Lock the phone. It keeps counting.
On your lock screen.
The countdown sits on the lock screen and in the Dynamic Island, with pause and next. On Android it is a live notification.
Out loud, over your music.
Beeps and a voice call every change, in nine languages. Cues play on top of Spotify or a podcast, at Soft, Medium or Loud.
On your wrist.
Apple Watch shows the clock and taps you at every change. Wear it and your heart rate lands on the recap.
Send it to anyone.
Share a timer as a link or a QR code. It runs free in the app or in a browser, no account needed.
No ads, no account, no run limits.
What everyone else does.
No shade. Just the room we’re in.
Most timer apps
Free until you want to save a config.
Kronos
Save everything. Free.
Most timer apps
Free with ads between rounds.
Kronos
No ads. Ever.
Most timer apps
One timer free. Pay for two.
Kronos
Unlimited custom timers.
Most timer apps
Sign up before you start.
Kronos
Open it. Hit start. Lift.
Their apps are good apps. They made different choices.
How the free interval timers compare
Our footer reads: time is the unit.
The timer is the literal expression of that. Charging for it would be charging for the unit. So we don’t.
Kronos Pro
Free forever. Pro when you want a coach in it.
Pro fills your timer with real exercises for the kit you have, stacks timers into one run and keeps your bests. Paste any workout, or snap a photo, and Kronos makes it runnable, with your loads.
iOS & Android
Free interval timer. Always.
iPhone and Android. No account. No catch.
