Fasting,
without the ads.

You eat within a daily window, for example 8 hours, and fast for the rest, for example 16 hours. It's about when you eat rather than a strict diet. Many people find it an easier way to eat less and more mindfully.

It isn't right for everyone, and it's a decision to make with your doctor. LeanFast starts with a short safety check. If you're under 18, pregnant or breastfeeding, or have a history of disordered eating, it won't create a fasting plan and offers a gentle mode with no fasting instead. If you take medication for diabetes or have another condition that needs medical supervision, your plan stays at a 12-hour overnight fast. Please talk to your doctor before you start. LeanFast gives general wellness information, not medical advice.

No, and it never will. There are no ads, no analytics or tracking tools, and your data is never sold. Every free feature works without an account, and Prism is an optional upgrade.

Yes. Ask Coach answers on your device. On an iPhone or iPad with Apple Intelligence (iPhone 15 Pro and later, for example), Apple's on-device model writes the answer from LeanFast's own notes. On other models, you get the matching hand-written note. Your questions never leave your device, and questions about symptoms, pregnancy, medication, eating disorders or a crisis always get a fixed, hand-written answer. Lens reads labels and barcodes on your device, and meals there too by default. Smart Lens is optional and asked once: a cloud AI in Europe names the dish, and your photo is reduced, stripped of metadata, not stored and not used for training.

You don't have to decide. LeanFast looks at your experience, activity, age, BMI and goal and recommends one. You can compare all three on the plan screen and switch at any time.

Yes, if you want it to. Turn on Autopilot in Settings and each planned fast starts as your eating window closes and ends when the next one opens. Skipping a night takes one tap, and you can still start, end or change any fast yourself. Rather press Start? Tap Start fast right in the evening reminder.

No. Every free feature works on your device without one. An account, made with a 6-digit email code and no password, keeps your plan, fasts, water and weight on all your devices and safe when you change phones, with your data stored in the EU.

iPhone and iPad with iOS or iPadOS 26.1 or later, including iPhone Duo, where the layout adapts as you fold and unfold. On iPad you get Split View, resizable windows and a sidebar. The Apple Watch app needs watchOS 26 and has complications for your watch face. Sign in to keep your plan and history the same on every device.

Yes. The Watch app shows your stage ring and lets you start and end fasts, log water and see your stages, with complications for your watch face. It keeps working when your iPhone is out of range and syncs once it's back. If you feel unwell, it stops your fast and calls your local emergency number in one tap.

Yes. Lens reads EU and US nutrition labels in English, French, German, Spanish, Italian, Portuguese and Dutch, and recognition runs on your device. For sharper meal recognition you can turn on Smart Lens, a cloud AI in Europe that names almost any dish. Your photo is reduced, stripped of metadata, not stored and not used for training. Barcode lookups that aren't in the built-in database ask Open Food Facts for the barcode number only.

Black coffee, plain tea and water are generally fine. Milk, sugar and most “diet” extras aren't. Scan them with Lens and it tells you whether they break your fast.

If you choose to. LeanFast can read your height, weight, steps and sleep to set up your plan and keep your weight chart current, and it saves the weight and water you log. You pick each data type in Apple's permission screen, and Health data is never used for ads or shared.

Tap “Not feeling well?” on the Today screen, or “I don't feel well” in Settings or on your Apple Watch. LeanFast stops your fast, shows simple recovery steps, and offers a one-tap call to your local emergency number. It knows the number for 234 countries and territories, and uses 112 elsewhere. Your streak is protected.

Monthly and Yearly both start with 7 free days, one free week per Apple Account. We remind you on day 5, and if you cancel before day 7 you pay nothing. Manage it in Settings › your name › Subscriptions on your iPhone or iPad.

English (US and UK), German, French, Spanish (Spain and Latin America), Italian, Portuguese (Brazil and Portugal), Catalan, Russian, Arabic, Chinese (Simplified), Japanese, Korean, Turkish, Indonesian, Malay, Hindi, Dutch and Polish, including every recipe and coach message. In Arabic, the app reads from right to left. The app follows your device's language and uses English for any other language.