cero

THE INTERVAL TIMER THAT MOVES WITH YOU

Your workout.
Your rhythm.

Bring the effort. We’ll keep the time.
Meet Cero, the interval timer built around the way you train.

Download on theApp Store

For iPhone, iPad & Apple Watch

Find your rhythm
Cero’s current simple timer on iPhone 17 Pro, with the green wave around 55 percent full during a high-intensity interval
WORK. REST. REPEAT.
MADE FOR YOUR KIND OF MOVEMENT
  • HIIT
  • Tabata
  • HYROX
  • Circuits
  • Strength
  • Boxing

LESS CLOCK-WATCHING. MORE MOVEMENT.

Stay in the zone.
We’ve got the seconds.

From the first warm-up to the last recovery, Cero keeps your session moving.

A quick start.
A workout that’s yours.

Choose your work and rest times, add your sets, and go. Or build every interval from scratch.

Eyes on the workout.
Ears on the next round.

Clear colors, sounds, voice cues and vibrations help you follow the session without watching the clock.

Find your favorite.
Come back stronger.

Save your go-to timers, duplicate a session, and keep your next workout ready when you are.

YOUR TRAINING. YOUR RULES.

A little structure.
A lot of possibility.

Quick intervals for a busy day. A full circuit when you have more to give. Build the session you need, down to the last second.

  • Work, recovery, warm-up and cool-down
  • Custom intervals, colors and intensity levels
  • Saved workouts, ready for another round
Build your next workout in Cero
Cero’s current interval builder on iPhone 17 Pro, with the template picker, work and recovery intervals, and per-interval timing controls
Every interval, your way.

KEEP YOUR FLOW

From your phone.
To your wrist.
Into your routine.

Apple Watch, in your corner.

Run saved workouts from your wrist and follow your heart rate through the session.

Your cues. Your soundtrack.

Make the session feel like yours with customizable sounds, voice cues and music.

Beyond the intervals.

A countdown and lap stopwatch cover warm-ups, rest periods and everything in between.

YOUR NEXT SESSION STARTS HERE

Ready. Set. Cero.

Make every interval count.

Download Cero

Available on the App Store