The free interval timer.
Free forever.
HIIT, Tabata, EMOM, AMRAP and full custom. 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.
Four presets
Ready to go.
Tap one. Tap start. Lift.
HIIT
40s work · 20s rest · 8 exercises · 3 rounds
Tabata
20s on · 10s off · 8 intervals
EMOM
Every minute on the minute · 10 minutes
AMRAP
As many rounds as possible, self-paced
Or build your own.
Five inputs: work, rest, exercises, rounds, reset between rounds. Tap the field, change the number. Save it for next time. Free.
What it does without asking
Built to stay out of your way.
- 01
Set it down. Walk away.
The screen stays lit the whole workout, so every beep and buzz lands without you waking the phone or tapping a thing.
- 02
Plays nice with your music.
Spotify, podcasts, whatever. Our cues mix on top. No ducking, no fade-out.
- 03
Save unlimited presets.
Build a 40/20/8/3 once. It’s there forever. No account, no cloud, no upsell.
- 04
No ads. Not now, not ever.
You don’t need a paywall to remove ads we never put there.
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.
iOS & Android
Free interval timer. Always.
iPhone and Android. No account. No catch.
