Rhythm for iPhone

Rhythm Support

Rhythm is an iPhone app for intermittent fasting with a capybara companion called Kapi. This page answers the common questions. If yours is not here, write to us at the address at the bottom of the page.

Rhythm needs an iPhone with iOS 18 or later. It is available in nine languages: English, Spanish, Portuguese (Brazil), German, French, Japanese, Simplified Chinese, Traditional Chinese and Korean. It follows your iPhone's language; on an iPhone set to another language, Rhythm appears in English. To choose a language yourself, open Settings → Language in Rhythm: the whole app switches at once, with no restart. Siri and Shortcuts keep your iPhone's language.

Recording your day

How do I record a fast?

Tap Start eating when you have your first meal and Done eating for today after your last. The time between Done eating and the next Start eating is your fast. There is nothing else to start or stop.

I forgot to tap. Can I fix the time?

Yes. Tap any time shown on the card at the top of Today, for example "Fasting since 8:10 PM", and choose the right time. You can go back up to 48 hours. For older days, open Journey, tap the day, and add or edit the fast there.

I tapped by mistake.

An Undo button appears for 10 seconds after Start eating, Done eating and most changes. After that, correct the time as described above, or delete the fast in Journey.

I had a snack after I said I was done.

Tap Start eating and then Done eating again. A stop and restart within two hours, or inside the same eating window, counts as one eating window.

Does a longer fast earn more?

No. Every completed fast earns the same coins, whatever its length, and ending early is treated exactly like ending on time. Rhythm never asks you to make up for anything.

Your plan and the ring

How do I read the ring?

It is a 24-hour clock with midnight at the top and noon at the bottom. The pale lane is your planned eating window, the solid line is what you actually did, and the dot is now.

How do I change my plan?

Tap the plan line on the top card, or open Settings → Fasting plan. Choose 12:12, 14:10, 16:8 or a custom window; a custom plan can fast between 10 and 18 hours a day. You can also drag the knobs at the ends of the window directly on the ring.

I only want to change today.

A change applies to today only unless you tap Every day. To return, tap Back to plan.

I do not want to fast today.

Open the eating window and choose No fasting today. Nothing is lost and nothing is counted against you.

Meal photos

How do I add a photo?

Tap the camera button on Today to take one, or hold it to choose a photo from your library. The time the photo was taken becomes the time of the meal, and you can change it.

Rhythm cannot use the camera.

Open iOS Settings → Rhythm and allow Camera. You can keep using photos from your library without it.

Why do some photos get a one-word label and others do not?

The label is suggested by the language model built into the iPhone and needs iOS 27 with Apple Intelligence turned on. On other iPhones there is no automatic label. You can type your own label, change it or remove it.

Where are my photos kept?

On your iPhone and, if iCloud sync is on, in your own private iCloud. They are saved without location information and are never uploaded to us. To hide them in Journey or delete them all, open Settings → Meal photos.

Kapi, coins and games

What can I do with Kapi?

Tap, hold, stroke or tickle. Give water at any time. Feed when you are not fasting; give a hot-spring bath while you are. Kapi naps while you fast and wakes when touched.

Does Kapi get hungry or sad if I am away?

No. Kapi is always content. Nothing decays, nothing is lost by missing a day, and there are no streaks.

What are coins for?

Coins are earned by completing a fast, logging water, opening the app each day, spending time with Kapi and playing. They are being saved for things that will come in a later version; today there is nothing to spend them on. Coins cannot be bought and never go down.

Where are the mini-games?

Tap Play in the row below the ring. A round takes about 30 seconds and cannot be lost. To turn the sound off, open Settings → Games. The sounds also follow your iPhone's silent switch.

Kapi is not moving.

Check Settings → Accessibility → Reduce pet animation in Rhythm, and Reduce Motion in iOS Settings → Accessibility → Motion. With either one on, Kapi is shown as a still picture; touches and reactions still work.

Lock Screen, widget, Control Center and Siri

The Live Activity does not appear.

It shows only while a fast is recording. Check Settings → Lock Screen → Live Activity in Rhythm, and that Live Activities are allowed for Rhythm in iOS Settings. iOS ends a Live Activity after about eight hours; open Rhythm once and it returns for the rest of the fast. The Dynamic Island exists only on iPhone models that have one.

How do I add the widget?

Touch and hold an empty area of the Home Screen, tap Edit, then Add Widget, and search for Rhythm. There are two sizes. The widget has a button for Start eating and Done eating.

How do I add the Control Center control?

Open Control Center, touch and hold an empty area, tap Add a Control, and search for Rhythm. The control is called "Start or Done Eating".

What can I say to Siri?

"I'm eating in Rhythm" and "I'm done eating in Rhythm". The older phrases "End my fast in Rhythm" and "Start my fast in Rhythm" also work. The same two actions are available in the Shortcuts app.

Reminders

Which reminders are there?

Three, all optional: when your eating window opens, when it closes, and when a fast reaches its planned end. Turn each on or off in Settings → Reminders, where you can also be reminded a few minutes early.

I get no reminders.

Check that notifications are allowed for Rhythm in iOS Settings → Notifications, and that a Focus is not silencing them.

Your data

Do I need an account?

No. Rhythm has no account and no sign-up.

How do I sync with my other devices?

Turn on Settings → iCloud sync → Sync with iCloud on each device, signed in to the same Apple Account. The change takes effect the next time Rhythm opens. Your data is kept in your own iCloud; we cannot read it.

Sync says "Sign in to iCloud" or "Sync paused".

Sign in to iCloud in iOS Settings, make sure iCloud has free storage and the iPhone is online, then open Rhythm again.

How do I export my data?

Settings → Your data → Export data. You get a file you can save or share; meal photos are included if you have any.

How do I delete my data?

Settings → Your data → Delete all data. This removes everything from your iPhone and, if sync is on, from your iCloud, and it cannot be undone.

Does Rhythm work with Apple Health?

No. Rhythm does not read from or write to Apple Health.

The details are in our privacy policy: Rhythm Privacy Policy

Is fasting right for you?

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:

If any of these apply to you, please talk to a clinician first. Whenever you feel unwell during a fast, stop and eat. The same guidance is in the app under Settings → Privacy & health.

Contact

Zhan Rushman LLC (MATRIXBUNNY)
E-mail: support@matrixbunny.com

When you write, it helps to mention your iPhone model, your iOS version, and the Rhythm version shown in Settings → Support.