LeanFast: Intermittent Fasting
Ad-free timer, tracker & plan
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Plan and track your fasts, water, weight and meals, with recipe ideas for your eating window. No ads, no trackers, private AI and safety built in. Free to start.
Plan, track and keep up your intermittent fasting, with water, weight and food in one place. LeanFast shapes a plan around your body and your week, shows Fasting or Eating at a glance, logs your fasts, water, meals and weigh-ins, and suggests recipes for your eating window. No ads, no trackers, AI that stays on your device, and safety built in. Free to start.
WHY LEANFAST
• No ads, ever. No trackers, and your data is never sold.
• Private AI: with Apple Intelligence, Coach answers your questions on your device, with the sources behind each answer, and Lens reads labels and barcodes there too. Smart Lens is optional, runs in Europe and doesn't keep your photo.
• Safety first: a short health check adapts your plan, and "I don't feel well" stops your fast and calls the local emergency number in 234 countries and territories.
• Backed by science: every source is listed in Settings › Health sources.
• Accessible: VoiceOver, Dynamic Type at every size and Reduce Motion.
• Everywhere: iPhone, iPhone Duo, iPad and Apple Watch.
ALWAYS OBVIOUS
One big word tells you where you are: Fasting, Eating or Not fasting, on Today, your Lock Screen, widgets and Apple Watch. Tap Start fast in the evening reminder, or turn on Autopilot: every planned fast starts when your eating window closes and ends when the next one opens.
PLANS AS UNIQUE AS YOU
LeanFast recommends Spark (from 12:12), Flow (the classic 16:8) or Blaze (longer fasts) and eases you in over four weeks. Shape every day on a 24-hour dial: brunch on Sunday, a late dinner on Friday, rest days when you need them.
A TIMER YOU CAN GLANCE AT
Follow your body stage by stage, with a new explanation at each milestone, on your Lock Screen, in the Dynamic Island, widgets and Control Center. Siri can start your fast, and the Watch app keeps going when your iPhone is out of range.
MOTIVATION THAT'S GOOD FOR YOU
Weekly challenges and levels reward consistency, water and logging, never longer fasts. A sick day never breaks your streak, and friendly water reminders let you log a glass from the notification.
LEANFAST PRISM
• Lens: a Fast-Friendly grade, nutrition facts and healthier swaps for any meal, label or barcode.
• Kitchen: 96 photographed recipes to break your fast, with cook mode, timers and a shopping list.
• Coach: a weekly review, answers to your questions and a nudge when your plan should change.
• Deep insights: weight trend, goal forecast, consistency calendar and time in each stage.
• Ring themes, app icons, progress photos, Streak Shields and custom fasts.
WORKS WITH APPLE HEALTH
Fill in your profile from Apple Health, import weigh-ins from your smart scale and save the weight and water you log. You choose what's shared.
PRICING
Free to use, no account needed. Prism is available monthly or yearly (each with a 7-day free trial) or as a one-time lifetime purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period; manage them in your Apple Account settings.
LeanFast provides general wellness information and is not a medical device or a substitute for professional medical advice.
Terms: https://lean-fast.com/terms
Privacy: https://lean-fast.com/privacy
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• Each plan now shows the date you could reach your goal weight.
• New photos in the setup screens.
• New badge designs and a new Prism logo.
• On Apple Watch, the fast's ring follows the edge of the screen.
• We reread every language and reworded what sounded off.
• Reminders now arrive even if you haven't opened the app in days.
• Deleting your account removes it from all your devices.
• Lens updates the grade when you change a portion, and a photo with no food in it no longer uses a free scan.
• Fixes for plans, streaks, challenges, sync and Apple Health.
The developer, Hajer Trabelsi, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- Contact Info
- User Content
- Identifiers
- Other Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- User Content
- Sensitive Info
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Hajer Trabelsi
- Size
- 47.5 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 26.1 or later.
- iPhone
Requires iOS 26.1 or later. - iPad
Requires iPadOS 26.1 or later. - Mac
Requires macOS 26.1 or later and a Mac with Apple M1 chip or later. - Apple Watch
Requires watchOS 26.0 or later.
- iPhone
- Languages
English and 17 more
- English, Arabic, Catalan, Dutch, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Malay, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Turkish
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Prism Lifetime $49.99
- Prism Monthly $3.99
- Prism Yearly $29.99
- Copyright
- © 2026 LeanFast
