Best Fasting Tracker Apps for iPhone in 2026: 7 Compared
Checked 20 October 2026. Every competitor detail below comes from that app's US App Store page and Apple's public lookup data, fetched that day. Left details come from the app itself.
A fasting tracker times your fasting window, reminds you when it starts and ends, and keeps a history so you can see your pattern. Some apps stop there; others add meal logging, AI food scanners, recipes or coaching. This page compares how the apps work, not whether fasting is right for you.
Fasting isn't right for everyone. None of these apps is medical advice. Speak with a qualified healthcare professional before fasting, especially if you're pregnant, under 18, have an eating disorder, take medication or have a health condition.
Disclosure: we make Left, so we have put it first. Here is why, and when another app suits you better.
Quick verdict
- Best if you want fasting next to habits, countdowns and your day plan: Left (fasting is part of Left Premium).
- Most-rated app here, with Apple Watch and meal logging: Zero.
- Best minimal timer with widgets, Live Activities and a free Apple Watch app: Fasty (Intermittent Fasting Tracker by Kai Oelfke).
- Best free core with no ads and no account: Easy Fast.
- Best for fasting plus calorie tracking: Intermittent Fasting Tracker by Leap Health.
- Best for a guided, coach-style program: BodyFast.
- Best for a full program with recipes and a food scanner: Fastic.
Comparison table
Ratings and counts are from the US App Store, checked 20 October 2026; Left's is its worldwide average. "Not stated" means the listing doesn't mention it, not that the feature is missing.
| App | Price model | Widgets and Live Activities | Apple Watch | Meal or calorie logging | Rating (US) |
|---|---|---|---|---|---|
 Left | Fasting is part of Left Premium (subscription or lifetime) | Yes (Home Screen, Lock Screen, Live Activity) | Yes, with complications | No | 4.7 (worldwide) |
 Zero | Free timer; Zero Plus subscription | Fasting widget (release notes) | Yes | Yes (Plus) | 4.8 (445,295) |
 Fasty | Free core; Basic or Pro, monthly, yearly or one-time | Yes (some widget views need Pro) | Yes, free | Not stated | 4.9 (51,887) |
 Easy Fast | Free core; Easy Fast Pro | Yes (Pro) | Yes (Pro) | Not stated | 5.0 (9,043) |
 Leap Health IF Tracker | Free; Premium subscriptions and other purchases | Live Activities (release notes) | Yes | Yes | 4.9 (29,120) |
 BodyFast | Free plans; Coach subscription | Not stated | Not listed | AI food scanner (release notes) | 4.7 (146,176) |
 Fastic | Fastic Plus for full access | Not stated | Not listed | Yes | 4.8 (246,100) |
1. Left: fasting alongside the rest of your time
Left is a time awareness app for iPhone. Fasting is one of its tools, next to habits and streaks in Since, countdowns in Ahead and the Planner day view.
- Schedules: Automatic (Left schedules and begins a fast on the hours and days you choose), Overnight, Sunrise to sunset (follows local solar times through the seasons, using coarse location), Custom, or Open to start fasts freely.
- The timer: a timeline shows when the fast began, where you are now and when the planned window ends. You can stop early or keep going after your goal.
- Reminders: before-fast alerts one hour before, thirty minutes before and at the start, and during-fast alerts with three hours left, one hour left and when the window completes.
- Live Activity and widgets: show the Live Activity for the whole fast, only the final three hours, or not at all. Fasting widgets show the active timer, the next window and weekly progress on the Home Screen, and a rectangular widget works on the Lock Screen.
- History you can fix: My fasts lets you add a past fast, correct start and end times or remove a wrong entry. Statistics show fasting over time, average duration by weekday and how consistent your fasts are.
- In your day: Planner's daily Summary can include fasting next to weather, sleep and workouts, in the same day view as your events and reminders.
Best for: people who want a calm fasting timer that sits alongside their habits, countdowns and day plan, rather than a diet program.
Price: fasting is part of Left Premium, a subscription or lifetime purchase, which also unlocks unlimited habits and countdowns, Planner and more. Prices are shown in the app before you buy.
Pros: five schedule types, including sunrise to sunset; a Live Activity you can limit to the final three hours; editable history; fasting in the same app as your habits.
Cons: not free: fasting needs Left Premium, while most apps here have a free timer; fasting in Left doesn't log meals, water or weight; needs an iPhone with iOS 26 or later.
2. Zero: Fasting & Food Tracker
By Zero Longevity Science, Inc. Its App Store page says Zero is free "with fasting timers, streaks, weekly trends, expert articles, and challenges included". Zero Plus, an optional subscription with a free trial, adds photo meal logging, a Protein Score, water tracking, custom fasts and saved presets and more. Its release notes describe an Apple Watch app with complications and a fasting widget.
Best for: the most established fasting app, if you also want to log meals.
Price: free timer; Zero Plus is a subscription. The in-app purchase names don't say which price is monthly or yearly.
Pros: 4.8 from 445,295 ratings; Apple Watch app; Siri support; a clear medical disclaimer in the listing.
Cons: custom fasts need Plus; iPad isn't in its compatibility list; its privacy label lists health and fitness, location and contact info among data linked to you.
3. Fasty (Intermittent Fasting Tracker by Kai Oelfke)
By Kai Oelfke. Its App Store page describes widgets and Live Activities to "check your timer from your Home Screen, Lock Screen, and Dynamic Island", an Apple Watch app to start and finish fasts "included for free", history and charts, Siri and Shortcuts, and CSV import and export, with no account. It says it "does not recommend fasting or a specific fasting plan".
Best for: a simple timer that's visible everywhere, without paying for the basics.
Price: free core features; Fasty Basic is offered monthly or yearly, and Fasty Pro monthly, yearly or as a one-time purchase, with details shown in the app.
Pros: widgets and Live Activities; Apple Watch app included for free; no account; 4.9 from 51,887 ratings; updated in October 2026.
Cons: listed for iPhone and Apple Watch only; no meal tracking listed; some widget views need Fasty Pro.
4. Fasting Tracker • Easy Fast
By Samtark Pty Ltd. Its App Store page lists core features at no cost: a fasting timer for daily fasts such as 16:8 and 18:6, an open-ended Flexi Plan, fasting stages, water and weight tracking, edit history, and "Zero Ads & No Accounts". Easy Fast Pro adds OMAD, 20:4, week-by-week programs and extended fasts, and tracking on the Home Screen, Lock Screen, Dynamic Island and Apple Watch.
Best for: a generous free timer with no ads.
Price: free core; Easy Fast Pro is an in-app purchase (the listing doesn't say whether it's recurring).
Pros: 5.0 from 9,043 ratings; no ads or account; iPhone, iPad, Mac and Apple Watch.
Cons: widgets, Live Activities and the Apple Watch app need Pro; its privacy label lists health and fitness, contact info and sensitive info as linked to you.
5. Intermittent Fasting Tracker by Leap Health
By Leap Health. Its App Store page lists 14:10, 16:8, 20:4 and OMAD plans plus custom schedules, a water tracker, sync with Apple Health, and an AI calorie counter, food scanner and barcode scanner. Release notes describe Live Activities on the Lock Screen.
Best for: people who want fasting and calorie tracking in one app.
Price: free to download; Premium (monthly, half-year and annual subscriptions, plus other purchases such as Remove ads) unlocks OMAD and fully custom schedules, advanced calorie tracking, premium recipes and no ads.
Pros: 4.9 from 29,120 ratings; Apple Watch; Apple Health sync; Live Activities.
Cons: fully custom schedules need Premium; the free version shows ads; its privacy label lists identifiers and usage data used to track you.
6. BodyFast: Intermittent Fasting
By BodyFast GmbH. Its App Store page lists free features including more than 10 customizable fasting plans, a fasting timer with reminders, weight and body measurements, fasting stages and a water tracker. A Coach subscription adds a weekly personalized plan, daily coaching and help from the BodyFast team. Recent release notes add an AI food scanner.
Best for: people who want a structured weekly program with coaching.
Price: free plans; the Coach subscription is offered for 1, 3, 6 or 12 months.
Pros: a solid free set of plans; 4.7 from 146,176 ratings; iPhone, iPad and Mac.
Cons: Apple Watch isn't in its compatibility list; widgets aren't mentioned; we didn't find a medical disclaimer in the listing; its privacy label lists identifiers and usage data used to track you.
7. Fastic Weight Loss & Fasting
By HealthVida GmbH & Co. KG. (sold by Fastic GmbH). Its App Store page lists a fasting timer, a food and calorie tracker, AI chat guidance, a step counter, a water tracker, Apple Health sync, a food scanner, more than 4,500 recipes, challenges and fasting buddies.
Best for: people who want an all-in-one program built around fasting, with food tracking, recipes and coaching.
Price: free to download; full access and a personalized plan need Fastic Plus, offered for 1, 3 or 12 months.
Pros: 4.8 from 246,100 ratings; a large recipe library (listed with Fastic Plus); Apple Health sync.
Cons: the listing doesn't say what's free; Apple Watch isn't in its compatibility list; widgets aren't mentioned; we didn't find a medical disclaimer in the listing; its privacy label lists several data types used to track you.
How we chose
- Search first: we searched the US App Store for "intermittent fasting", "fasting tracker" and "fasting app" on 20 October 2026, and kept apps whose listings describe fasting tracking as a core feature.
- Kept: apps updated in the last few months with thousands of ratings.
- Left out: an app whose listing no longer mentions fasting, and an app not updated since 2019.
- Health claims: several listings make claims about what fasting does for your body. We don't repeat or rank on them, and we haven't tested any health outcome.
- Sources: each app's own App Store page, including release notes, and Apple's lookup data. No paid placements, and no developer reviewed this page.
Which one should you pick?
- You already use Left, or want fasting next to habits and your day plan: Left Premium.
- You want the most established app with meal logging: Zero.
- You want a free timer on the Lock Screen and Apple Watch: Fasty.
- You want a generous free timer with no ads: Easy Fast.
- You want calories and fasting together: Leap Health's tracker.
- You want coaching: BodyFast or Fastic.
Read the guide to fasting in Left for the setup. To work out timings without an app, try the end of fasting calculator, the fasting countdown or the fasting duration calculator.
Questions
What is the best fasting tracker app for iPhone?
Of the apps compared here, Zero has the most ratings and adds meal logging. Fasty has widgets, Live Activities and a free Apple Watch app. Left suits you if you want fasting next to your habits, countdowns and day plan, with Left Premium.
Is there a free intermittent fasting app?
Yes. Zero, Fasty, Easy Fast, BodyFast and Leap Health's tracker all list a free timer, with paid upgrades. Fasting in Left is part of Left Premium.
Which fasting apps show a timer on the Lock Screen?
Left, Fasty and Leap Health's tracker describe Lock Screen Live Activities, and Easy Fast lists Lock Screen and Dynamic Island tracking with Pro. Left also has a rectangular Lock Screen fasting widget.
Which fasting apps work on Apple Watch?
Zero, Fasty, Easy Fast (Pro) and Leap Health's tracker list Apple Watch on their App Store pages. Left, BodyFast and Fastic don't.
Is fasting safe?
That depends on you, and a fasting app can't decide it. Speak with a qualified healthcare professional before fasting, especially if you're pregnant, under 18, have an eating disorder, take medication or have a health condition.
Start noticing what matters.
Download Left on your iPhone to see the time you have left, dates you are looking forward to, build the habits you want to keep, and become a better version of yourself.
Scan or search "Left" on the App Store.