Rhythm for iPhone

Rhythm — Find your rhythm. Fast gently. Live fully.

Tap when you start eating and when you're done. Your day lives on one 24-hour ring, and Kapi the capybara keeps you company.

Coming soon to the App Store · For iPhone with iOS 18 or later

Meet Kapi

How it works

Tap Start eating at your first meal. Tap Done eating after your last. The time in between is your fast, and Rhythm keeps the record.

A day with Kapi.

Kapi lives on the same screen as your ring: awake while you eat, napping while you fast.

  1. Morning — Water first.

    Last night's fast is still running. Share a glass of water with Kapi; water is there any time.

  2. Start eating — The window opens.

    One tap at your first meal. While you're not fasting, feed Kapi corn, pumpkin, watermelon or a bundle of grass.

  3. Afternoon — Kapi wanders.

    Kapi roams the screen, plays with a yuzu and says hello when you come back.

  4. Done eating — Your fast begins.

    One tap after your last meal. Kapi yawns, stretches and settles in.

  5. Night — A hot spring, with yuzu.

    During a fast, run Kapi a bath. Tap, hold, stroke or tickle any time.

  6. While you sleep — Kapi naps while you fast.

    Never hungry, never sad, never disappointed in you. In the morning, the ring begins again.

Your plan, your day.

Choose 12:12, 14:10, 16:8 or a window of your own. Late dinner, early breakfast, a day off: drag the window on the ring or pick the times, just for today or for every day. Back to your plan in one tap.

Forgot to tap?

Tap the time to correct it, up to 48 hours back. Older days are edited in Journey.

Rhythm never asks you to make up for anything.

Calm on every screen.

Screen recording of Rhythm opening on iPhone: the 24-hour ring draws, Kapi leans in from the edge, the title card turns to show 7 hours 15 minutes left to eat, and Kapi sits in the ring.

Every launch

The ring draws itself to now, Kapi leans in, and the first card turns to your status.

Rhythm's Today screen: eating since 12:05 PM on a 16:8 plan, 7 hours 15 minutes left to eat, with Kapi awake inside the ring.

Today

Pale is your plan, solid is what you did, and the dot is now.

Rhythm's Today screen while fasting: 13 hours 31 minutes fasted, 2 hours 29 minutes to go, with Kapi dozing inside the ring.

Fasting

The card says whether you're eating or fasting, since when, and how long is left.

The eating-window sheet with the window moved an hour later on its dial, and the choice between Just today and Every day.

Adjust the window

Move today's window, just for today or for every day.

Kapi soaking in a wooden hot-spring tub with three yuzu while the fast records.

Kapi's hot spring

Bath time during a fast, with yuzu floating by.

The Yuzu Catch mini-game: Kapi catching falling yuzu, with a timer and a score.

Yuzu Catch

About 30 seconds a round. One to three stars and a personal best.

Journey's month calendar, with a dot under each day that had a fast.

Journey

This week, a month calendar and your pattern. Every fast counts on its own.

The iPhone Lock Screen with Rhythm's Live Activity showing a fast of 13:31:28 and a Start eating button.

Live Activity

The running fast on your Lock Screen and in the Dynamic Island.

iPhone Duo: Open it up.

Rhythm has layouts for both displays of iPhone Duo: the cover display in your hand, and the inner display with your ring and your week side by side.

Record without opening the app.

Lock Screen

A Live Activity shows the running fast on the Lock Screen and in the Dynamic Island. You can turn it off.

Widgets

Home Screen widgets in two sizes, with a button for Start eating and Done eating.

Siri and Shortcuts

A Control Center control and Siri phrases record without opening the app.

Quiet reminders

Optional notifications when your eating window opens or closes, and when a fast reaches its planned end.

Meal photos

Take a photo or choose one, and its time becomes the meal's time. No calories, no scores.

Coins and levels

Earned by completing a fast of any length, logging water, opening the app, time with Kapi and playing. They can't be bought and never go down.

Small games

Pop bubbles, catch floating yuzu. About 30 seconds a round, no lives, nothing to lose.

Made for everyone

Light and dark appearance, VoiceOver, Dynamic Type and Reduce Motion.

Nine languages

Pick one in Settings → Language and the whole app switches at once, with no restart. Siri and Shortcuts keep your iPhone's language.

Your rhythm stays yours.

0 accounts · 0 ads · 0 trackers · 0 servers of ours

No sign-up and no analytics. What you record stays on your iPhone and, if you choose, syncs through your own iCloud, which we cannot read. Export or delete everything at any time in Settings.

Read the privacy policy

No streaks. No penalties.

Every fast counts on its own, ending early is fine, and a day without a fast is simply a day. Coins never go down, and Kapi is always content.

Before you start

Rhythm is a wellness app, not a medical device, and it does not give medical advice. Intermittent fasting is not suitable for everyone. It may be unsuitable if you are under 18, are pregnant or breastfeeding, have or have had an eating disorder, or have a condition or take medication that makes fasting risky, such as diabetes. If any of these apply to you, or you are unsure, talk to a clinician first. If you feel unwell during a fast, stop and eat.

Find your rhythm.

Coming soon to the App Store

For iPhone with iOS 18 or later · In English, Español, Português (Brasil), Deutsch, Français, 日本語, 简体中文, 繁體中文 and 한국어

Rhythm Privacy Policy · Rhythm Support · support@matrixbunny.com