Best intermittent fasting apps

The app lives in Dynamic Island and on the lock screen, giving you fasting status at a glance without unlocking your phone. Users consistently call this system-level integration the app's biggest win.

No way to edit a timer once it's started or after it ends, so a misclick means a lost record. No sync between iPhone and iPad, so your data only exists on one device.

Anyone who wants a single-purpose tool with no extras: tap once, the timer runs, the number is always visible in Dynamic Island.

Mac plus iOS sync over iCloud is unique in this category. Educational content explaining what your body is doing at each fasting stage. A first-class Watch app with detailed on-screen info.

A paywall hits users on the main screen before they can try anything. The custom notification takes up too much space and is not configurable. Problems entering a future fast start time (the date resets).

Experienced IF practitioners who are invested in the Apple ecosystem (Watch, Mac, iPhone) and already know why they need a tracker. Works well for people running varied protocols including extended fasts.

A live fasting-phase display tied to elapsed hours. Users say this is exactly what keeps them inside their fasting window until the end.

No automatic schedule repeat: you have to manually start a new fast every day.

Any IF practitioner from beginner to advanced who wants clear visual phase feedback without extra screens.

A built-in schedule means you never have to manually start or stop. The app knows when you are fasting. Zero monetization pressure and no lifestyle questions on launch.

Notifications about the approaching eating window are unreliable. You cannot edit past-day times. Does not support fasts longer than 24 hours.

An experienced 16:8 practitioner who wants a quiet, accurate timer with no upselling and no subscription.

The growing virtual garden mechanic creates an engagement loop. Users say they do not want to kill their plant. Toggleable modules let you keep only the trackers you need without a cluttered home screen.

Custom fast durations outside of presets require a paid upgrade. There is no way to transfer data between iOS and Android, so your history and garden are gone if you switch platforms. Widgets show only the timer, not the garden.

People who need game-like motivation to build a fasting habit, especially a younger audience.

One start/stop button, an Apple Watch widget, no pushy notifications, and no paid pressure. You can also backdate the start time of a fast.

Statistics use a running total instead of a sliding window, making them misleading. Weight log entries show no year, so multi-year data becomes unreadable. Cannot log more than one fast per day.

Anyone who wants to tap a button and stop thinking. No education, no progress charts, just a clean timer with a weight log.

The only free tracker that breaks down not just macros but micronutrients (vitamins, minerals) with per-meal detail. The barcode scanner recognizes almost everything without a miss.

After a recent update, search surfaces branded products above generic names, turning a simple query like 'banana' into a multi-step hunt. This breaks the core fast-logging use case.

People who want full control over their diet with a focus on nutrients rather than just calories, and who are not looking for a dedicated fasting timer.

The ability to log a past fast retroactively and see a color-coded tile for the entire month keeps the feeling of a streak going.

No daily reminders on a set schedule. Users have to remember to start the timer themselves.

An experienced 16:8 or 18:6 practitioner who wants an honest archive without a subscription or extra screens.

Support for 40-plus-day extended fasts with hourly physiological cues. The visual progress ring and pie chart keep you motivated to continue.

Cannot edit or delete a fast once it has started. The time-picker scroll is finicky. A recent update removed some free features without notice.

Extended fasting practitioners (24-plus hours) who want a tracker with physiological context.

Automatic fasting pattern presets with push notifications for the start and end of a fast take the guesswork out of your schedule. The ability to delete a fast from history without penalty helps you keep accurate stats.

After updates the app sometimes fails to register that a fast ended and shows 'Start' instead of 'End', causing data loss. Apple Health weight sync does not work consistently.

People who want a simple, reliable timer with notifications and have no interest in food or meal plans.

Automatically calculates net carbs and builds keto-oriented recipes, removing the main pain point for keto beginners.

The journal periodically stops loading for days at a time, and the support page returns a 404, leaving users without any help.

People combining a ketogenic diet with intermittent fasting who want one tool for both.

Editable fast history lets you fix an incorrect start or stop without losing your data. Metabolic state display (ketosis, stable glucose) based on elapsed fasting time, no lab work required.

Apple Watch and iPhone run completely independently, giving you two unsynced counters at the same time. The streak counter breaks for fasts longer than 25 hours, counting them as skipped days. No countdown timer to the end of the eating window.

People who want a clean minimalist fast log with no keto advice and no gamification.

A real-time visual countdown keeps the current fast front of mind. The retroactive-start feature lets you log a fast honestly even if you forgot to tap the button on time.

Maximum fast length of 48 hours is not enough for extended formats. No Apple Health or Apple Watch integration despite repeated user requests. The weight goal feature is inaccessible after purchasing premium.

People doing 16:8 or 18:6 who want a simple tracker with a history and no extra features.

Users value the clean interface and the ability to control the timer directly from Apple Watch.

Data does not transfer when switching phones, the widget does not work, and support is unresponsive. These are critical failures for long-term habit tracking.

Apple Watch users who want to start and stop a fast with a flick of the wrist.

A live timer with named metabolic phases keeps users aware of exactly what is happening right now. Buddy fasting with real-time status of friends adds accountability.

The fast history adds ghost entries and shows incorrect hours on the All tab. You cannot change the start time of a completed fast. Achievements do not save.

People who find it easier to stay on track with a group and want to understand what is happening in their body hour by hour.

No paywalls. A visually clean interface with a fork-and-clock design. Six years of operation without core feature degradation, up until the most recent update.

A hard 24-hour cap is a dealbreaker for OMAD or multi-day fasting. The timer stops when the goal is reached instead of continuing to count. A rolling 7-day history means older fasts fall off the widget. Start-of-fast notifications do not fire.

People practicing standard 16:8 or 18:6 with no need for extended fasts, who value simplicity and a subscription-free experience.

The lock screen widget and the header timer gave users an instant summary without opening the app. Users directly name this as the main hook that kept them coming back.

The team moved the timer off the main screen into a buried navigation layer, breaking the primary UX pattern for loyal users. Switching to a new phone does not restore the account, so all progress is lost.

Beginners who want a polished interface and reminders, and who are willing to tolerate ads or pay for Plus upfront.

A recipe planner with macro counts gives users a structured weekly eating plan. Mood and energy tracking alongside food logs is a rare feature that helps reveal patterns.

The barcode scanner maps products incorrectly, such as identifying cheese as a sandwich. Minimum vegetable portions are locked at one cup with no way to reduce. The food database is geared toward European products, with many American entries missing.

People strictly tracking keto macros who want to cook from recipes rather than just fast by the clock.

The visual daily fasting progress combined with themed recipes creates a sense of being guided rather than just tracked.

A forced paywall with no option to dismiss makes the app unusable for some users.

Users ready to pay from day one who want to combine IF with meal tracking.

An educational section covering IF basics is available without a subscription and helps beginners get started. Automatic reminders for the start and end of a fast require no manual tap.

When clocks change for daylight saving, the timer goes off and there is no manual correction. Weight conversion to pounds does not work. The paid content behind the subscription, five recipes, is a disappointment.

Beginners who want a basic explanation of intermittent fasting and automatic reminders.

AI photo food recognition lowers the barrier for logging meals. A photo of your plate is enough.

The food database returns incorrect weights and units, and calorie counts do not match real-world food.

Beginners who want a single dashboard without diving deep into nutrition science.

A wide variety of workouts at different intensity levels resonates with users who combine IF with physical activity.

The timer stops when you close the app. After paying for a workout plan, the app begins showing every day as a rest day.

People who want to combine fasting tracking and home workouts in a single app.

A weekly auto-scheduled plan with protocol suggestions (16:8, 5:2, and others) reduces decision fatigue. You do not need to figure out today's protocol on your own.

The schedule cannot be copied to the next week, so you reconfigure from scratch every time. On top of that, the schedule editor's own logic (times cannot overlap mid-edit) makes the process take far longer than it should.

People who want a structured fasting plan with varied protocols and prefer not to design their own schedule.

The phase display and motivational push notifications at key milestones (18h, 24h) help users resist quitting.

In the free version, ads block the fast-ending button, which breaks the core mechanic of the tracker.

Paid subscribers who want a combined timer and meal planner and are not concerned about nutrient accuracy.

An educational section with videos from doctors and specialists gives beginners context on why to fast and what happens in the body. Dedicated buttons for Unimate and Balance products are convenient for users in the Unicity ecosystem.

Navigating to the in-app store section resets all data, a systemic bug that destroys trust. The app does not adapt to night-shift workers: the eating window cannot flex to non-standard schedules.

Unicity product users and people just starting out with fasting who want to understand the mechanics.

The app provides fasting phase context and responds to user progress, which creates a sense of support.

The timer resets or freezes when you leave the app, and the screen fills with food ads in the middle of a fast, which defeats the entire point of tracking.

IF beginners who have not yet discovered better alternatives.

Schedule mode automatically tracks eating windows without manual start/stop taps. A configurable schedule with daily reminders works for people with a stable routine.

Data disappears without warning. In schedule mode there is no way to manually log when you actually started or stopped fasting. Notifications arrive at random times.

A user with a fixed 16:8 schedule who does not need history and just wants a reminder.

AI food photo analysis with portion estimates works surprisingly well. Users note it lowers the effort of logging complex dishes that are hard to find in the database.

After every food entry, the app forces an animated tip that cannot be turned off anywhere in settings. This breaks the daily use rhythm and is directly cited as the main reason users delete the app.

Users who want AI dish photo analysis and a polished interface and can tolerate persistent educational content.

A real-time fasting phase display visually motivates users to hold out until ketosis.

The food scanner frequently fails to identify a product and returns zero calories, making nutrition data unreliable.

Users combining intermittent fasting with calorie counting who can tolerate an imperfect food tracker.

A 'flame' animation during peak fat-burning phase genuinely motivates users to keep going. People who lost 20-30 pounds credit this visual cue as a key driver.

The target weight algorithm has a serious bug: it substitutes someone else's parameters in place of the ones you entered. The app gives no warning about maximum safe fasting duration, which is a risk for vulnerable users.

People willing to pay for a subscription from day one who want motivating phase visualization.

Users point to ready-made workout plans and on-screen instructions that are clear even for beginners.

No adaptation for physical limitations (knee, back issues). Jumping exercises are presented as the only option with no alternative.

People without injuries who are looking for structured home workouts.

Progress challenges and hydration reminders help people starting from scratch maintain their rhythm.

Editing entries freezes or is unavailable, and the plan automatically switches when the schedule slips even slightly.

A beginner who needs a simple push to get through the first month and does not care about log accuracy.

A visual fasting phase breakdown with body-state labels and progress notifications resonate with users who make it past the onboarding.

A 30-question onboarding with no product preview first creates a feeling of being misled. Fast history has disappeared without explanation. The interface does not fit newer iPhone screen sizes.

A beginner willing to sit through an aggressive sales flow in exchange for a polished phase timer.

No subscriptions and no ads. Users appreciate that the app does one thing and does not get in the way.

No editing of start or end times. That is a fatal flaw for a tracker people run in the background rather than watch in real time.

People with very disciplined routines who always remember to tap the button on time.

Fasting start and hydration reminders work for beginners. The interface is simple enough to not confuse new users in the first few days.

The timer is unstable and the app crashes when logging water. After updates, authentication breaks so users who paid can no longer get in. The subscription scheme pushes people away before they can evaluate the product.

Not recommended to anyone in its current state. If the app is fixed and the forced early paywall is removed, it could work for absolute IF beginners.

A countdown widget to the end of the fast is actively used. A food diary with a product database helps beginners structure their eating.

Navigation is broken on iPhone 16/17 Pro Max: the back button is covered by the status bar. The subscription cancellation flow is deliberately obscured. It does not cancel through the App Store and requires a separate email.

A beginner looking for structure and recipes who can tolerate interface instability.

In-context content about what happens in your body at hour 4, 8, and 16 helps beginners stay motivated without separate reading.

The app has no way to log food with a barcode or scan calories, forcing users to switch to another service for a full picture. The absence of a basic calorie counter makes it a halfway tool.

People just starting intermittent fasting who want a simple timer with motivating content and no extra features.

A live chat coach who answers questions about supplements and vitamins is the only feature users praise with specifics.

No way to pause a fast without resetting the entire account. The eating window does not save changes. Content in the education section is duplicated from article to article.

Someone for whom live coach access matters and timer precision does not.

Simplicity: one screen with a timer and no extra settings, which works for complete fasting beginners.

The session resets every few days and wipes the entire fast history even when you sign back in with the same account. The bar chart shows scheduled time instead of actual fasting time.

People who want to try fasting without commitment and are okay with losing their history.

A simple visual progress bar and a fast history feed kept users engaged for years.

The app does not launch after updates: it freezes on the logo for one to several minutes and does not save sessions.

Not recommended to anyone in its current state. Historically it worked well for women new to 16:8 fasting.

Ready-made meal plans with recipes reduce cognitive load in the first days.

The food database is too sparse for self-directed logging. The fasting timer functions as a diary rather than an active tracking tool.

An audience that needs rigid external structure for eating and does not plan to keep a detailed food log.

A progress page showing fasting days gives users a sense of accumulated results over several weeks.

Switching from 16:8 to 18:6 is buried deep in settings and often does not save. The calorie database covers only store brands with no way to add your own meal. The timer merges multiple days together rather than counting them individually.

Hard to name a clear audience. The product wins neither on simplicity nor on depth.

The eating window structure and fast period reminders give users a sense of having a schedule.

No access to any features without a subscription, even after completing the survey. Interface typos reduce trust in the data.

Very hard to name an audience. The app does not let users try it before paying.

One-tap timer launch with no setup. Users note you can start immediately.

No way to correct the end time of a past fast retroactively. If you forget to tap, the data is gone. The app periodically wipes the entire history without warning.

Practically no one. Too unpolished for regular use.

No mechanics worth highlighting. Users found no value beyond the basic timer.

Editing the fast start time causes a crash. No fasting methodology content at all. Water is measured only in liters with no way to switch to ounces.

Practically no one. Competitors in the niche offer the same basics without these problems.

The dashboard design and navigation are appreciated by the rare users for whom the app actually opens.

The app does not launch on a significant portion of devices, showing a white screen with no fallback and no support response.

Not recommended to anyone in its current state.

Nothing substantial. Some users mention simplicity, but this is the only app in the set with not a single honest positive observation about the product itself.

A forced annual subscription from the first screen with no way to evaluate the product first. Impossible to cancel through standard Apple interfaces. Static content with recipes that are never updated.

No one.