For iPhone & Apple Watch

Turn any HIIT or stretching video into your own interval timer.

One YouTube link becomes a follow-along workout — and with no video, you can build your own intervals. Every move and every rest, called out loud.

00:40

Zestimer

 

Why I built this app

I’m an engineer, and I love writing code — I sit down and hours disappear. It caught up with me: rounded shoulders, an anterior pelvic tilt, an aching lower back. I got just about the full set.

One day my back hurt too much to ignore, so I decided to take stretching seriously and downloaded one of the popular stretching apps on the App Store. I rolled out a mat, worked through a whole routine, thought “this actually helps” — and just as I lined up another round, the paywall appeared.

So I thought: why not build my own app, with no cap on how many times I can train in a day, so I could really keep stretching and undo what sitting had done to my posture — and help anyone else in the same spot. That’s how Zestimer was born. Train as many times as you like, no limits: it’s here to make stretching easier to start, and easier to keep up.

Later I noticed something else. When people’s backs hurt, they go to YouTube and look for stretching videos from physical therapists and coaches. But once you find one you like, without a follow-along version you still have to remember the moves and count the time yourself. The videos pile up in your saves and rarely get opened again. So I added YouTube follow-along: turn any Short or video into a timed routine you can just follow, counting down and calling the rests, with every move and every interval adjustable to your own level.

Zestimer isn’t only a stretching app, of course. Use it for HIIT, Tabata and interval training too — or let AI put together a routine that suits you.

A simple, dependable partner you open and start — so moving your body doesn’t take much thinking.

If you sit a lot and your back aches too, come and try it. A little movement every day, and your body feels a little better. 🍋

From YouTube

Turn any video into a workout

Search YouTube right in the app, tap a video — Zestimer watches it, spots the moves, times the sets, and hands you a workout that runs itself. No pausing, no scrubbing back.

From YouTube

Pamela Reif 10-Minute No-Equipment Ab Workout

20 exercises · 10:00 · Core · Circuit · Quick

Circuit 1

Bicycle Crunches

00:30

Reverse Crunches

00:30

Supine Alternating Leg Extensions

00:30

Leg Raises

00:30

Russian Twists

00:30

Plank

00:30

+ 14 more moves

Start Workout

The video stays credited on the workout — one tap back to the creator.

Exercise Library

100+ moves, fully illustrated.

Cardio to yoga, burpees to savasana — every move has its own figure and step-by-step form.

Cardio

Jumping Jacks

Upper Body

Diamond Push-Ups

Flexibility

Downward Dog

Browse the library

Everywhere

One workout. Every screen.

Your iPhone runs the show

The dial, the coach, the library — home base.

And there’s more.

  • AI Coach

    Tell it your time, gear and mood — get a plan in seconds, then bend it with plain words.

  • Builder

    Drag, tap, done — circuits, rounds, work and rest come together in about a minute.

  • Forgiving streaks

    Weeks, not perfect days — and a Streak Freeze keeps the flame alive when life happens.

Pricing

Free

Everything you need to start.

  • The full timer — voice, beeps, haptics
  • 100+ illustrated moves
  • 24 ready-made routines
  • 10 custom workouts
  • Tracks every day you train
  • Apple Watch support
  • Beautiful Quick Start & heatmap widgets, right on your Home Screen
  • Apple Health & iCloud sync
  • Music controls mid-workout

Zestimer Pro

  • Turn any YouTube video into a workout
  • Personal AI coaching for every workout
  • Generate a workout from scratch with AI
  • Cast your workout to any TV or AirPlay display
  • Unlimited custom workouts
Get Zestimer free

7 days free

Prices in USD — the App Store shows your local price.

Workout Complete

Your move.

Zestimer is free on the App Store. Pro adds YouTube converts, AI coaching, TV casting and unlimited workouts.

illustrated moves
100+
ready-made routines
24
languages
8
Get Zestimer free