Best Intermittent Fasting Apps for iPhone

Zero: Fasting & Food Tracker is the best overall intermittent fasting app for iPhone because it has matured beyond a simple timer into an integrated fasting, protein, and habit platform. The 4.82 rating across 445,260 reviews is the strongest statistical signal in this category, built over nine years of refinement.

What sets Zero apart is the protein-plus-fasting equation. Most apps stop at tracking the fasting window; Zero adds a personalized daily protein target, photo-based meal logging with instant macro estimation, hydration tracking, and habit pillars (sleep, mood, movement). Reviewers consistently mention dropping 20 to 30 pounds while maintaining muscle, which is the meaningful weight-loss outcome.

Use case: a 35-year-old who wants to lose 20 pounds, isn't ready to count every calorie, but wants more structure than a bare timer. Zero combines a 16:8 timer with a protein target and photo meal logging, syncs to Apple Health, and surfaces longevity-science content from credible experts.

The tradeoff is the paywall. Zero Plus at $69.99 annually unlocks meaningful insights, while the free tier serves as an introduction. The interface also assumes you want preset fasts, which makes one-off fasts harder than they should be — a critique surfacing in reviews. For users serious about combining fasting with nutrition, Zero is the strongest pick.

Fastic is the best intermittent fasting app for weight loss because the German-engineered AI coach builds personalized plans around protein fasting, layers in 4,500-plus recipes, and pairs every fast with daily challenges and academy content. The 4.8 rating across 246,122 reviews reflects strong satisfaction with the structured approach.

What sets Fastic apart is the depth of the coaching layer. Fastic Score tracks fasting, hydration, sleep, nutrition, and movement together, the food scanner extracts calories and macros from a photo, and the AI chat answers fasting questions in context. The recipe library is genuinely useful, not the throwaway content many competitors offer.

Use case: someone in their thirties or forties who wants a guided weight-loss program with cooking ideas, not just a fasting clock. Fastic functions as a coach rather than a tool, which works well for users who want to be told what to do next.

The tradeoff is feature density. The free tier feels limited compared to Fasty or Easy Fast, and Fastic PLUS pricing aligns at the premium end of the category. Reviewers also note frequent upgrade prompts. For users who want structured guidance and don't mind paying for it, Fastic delivers the most complete weight-loss-oriented experience on this list.

BodyFast is the best intermittent fasting app for women because the BodyFast Coach calculates a fresh, personalized fasting plan every week based on your goals and progress, automatically adjusting intensity to match what your body is doing. The 4.71 rating across 143,372 reviews comes from a global community with 50 million-plus installs.

What sets BodyFast apart is the weekly coaching cycle. Most apps give you a static plan; BodyFast actively shifts your protocol, pulls in challenges, and rotates recipes so the plan never feels stale. The 220,000-member Facebook group adds accountability, and weekly health challenges (water, sleep, movement) build complementary habits.

Use case: a user balancing cycle awareness with weight goals, who wants the app to handle protocol decisions rather than picking 16:8 every day. BodyFast's adaptive coaching works particularly well for users who lose motivation with rigid schedules.

The tradeoff is the lighter free tier and the data-input load required for the coach to personalize effectively. Users who don't log consistently will find the coach's suggestions generic. Pricing aligns with the premium category at $59.99 annually. For users who want guidance that adapts week-to-week, BodyFast is the strongest pick.

FastEasy is the best intermittent fasting app for 16:8 because the onboarding makes it the easiest way to start the most popular protocol — pick your goal, pick 16:8, and the app generates a sensible plan with hydration and recipe suggestions. The 4.65 rating across 78,893 reviews reflects a focused product for the mainstream user.

What sets FastEasy apart is the simplicity-plus-personalization balance. Fasting plans cover 14:10 through OMAD, the AI generates personal recipes tailored to dietary preferences, and the calendar view gives a clean look at consistency. HealthKit integration writes weight and activity automatically.

Use case: a 30-something trying intermittent fasting for the first time, who picked 16:8 from social-media buzz and wants an app that doesn't require a PhD to set up. FastEasy onboards in under five minutes and stays out of the way.

The tradeoff is depth. FastEasy doesn't have the fasting-stages education depth of Zero or Easy Fast, and the AI recipe generation is hit-or-miss per reviews. The Welltech parent company also operates Yoga-Go and other lifestyle apps, with the typical subscription-heavy monetization that comes with that family. For users who want a clean 16:8 starting point, it's an effective pick.

Fasty (Intermittent Fasting Tracker by Kai Oelfke) is the best free intermittent fasting app because it has no ads, requires no account, supports Apple Watch and widgets, and is genuinely free for core features. The 4.87 rating across 46,774 reviews reflects a passionate community of users who left Zero, Fastic, and the shuttered LIFE app for something simpler.

What sets Fasty apart is the developer's commitment to keeping it minimal. Kai is a solo developer who built Fasty after LIFE Fasting Tracker shut down, intentionally avoiding the bloat and upsell that drives users away from larger apps. The Apple Watch app, Live Activities, widgets, and iCloud sync are all present without subscription gates for the core experience.

Use case: a user who tried Zero or Fastic, felt overwhelmed by the upsell, and wants a clean tracker that respects their time and data. Fasty's privacy-first stance also appeals to users skeptical of corporate health apps.

The tradeoff is feature depth. Fasty doesn't have AI calorie scanning, recipes, or fasting-stage education libraries the way Zero does. The app accepts optional donations or subscriptions to support development, which is the fair-software model the developer endorses. For users who want a beautiful, fast, no-nonsense timer, Fasty is the standout indie pick.

Intermittent Fasting Tracker by Leap Health is the best intermittent fasting app for tracker users because it combines fasting protocols with an AI calorie scanner, barcode lookup, macro tracking, and a glucose and ketone monitor in a single interface. The 4.91 rating across 28,164 reviews is among the highest in the category.

What sets Leap Health apart is the breadth of trackable signals. Beyond fasting, you can log weight, BMI, body measurements, glucose, ketones, resting heart rate, steps, and sleep — and the visual charts make trend comparison fast. The AI food scanner reads packaged labels via barcode and estimates calories from photos.

Use case: a data-driven user who already wears a CGM, tracks macros, and wants their fasting app to absorb all of that into one timeline rather than juggling four apps. The no-account onboarding lowers friction.

The tradeoff is that the kitchen-sink approach can feel overwhelming compared to focused apps like Fasty. Subscription pricing also tracks the premium end of the category. The 60-million-user claim is substantial. For users who want one tool to track fasting plus body data plus food, Leap Health is the strongest comprehensive pick.

PureFast (Intermittent Fasting: PureFast) is a budget-tier option in the category that pairs fasting timers with workout content branded as BURN. The 4.8 rating across 14,831 reviews reflects a smaller but satisfied audience using it as a combined fasting and exercise companion.

What sets PureFast apart is the workout content layer. Most fasting apps stop at the timer; PureFast layers personalized workout plans, meal plans, and exercise variety on top of fasting, positioning itself as a holistic weight-loss app for users who don't want to download a separate fitness app.

Use case: a beginner who wants a single app for fasting plus light home workouts, willing to accept lower production quality in exchange for an all-in-one solution. The Apple Health integration handles the basics.

The tradeoff is depth. PureFast's workouts won't match dedicated fitness apps like Workout, Caliber, or Future, and the fasting timer doesn't have the polish of Zero or Easy Fast. The product positioning is also confusing — the App Store name is PureFast but the in-app branding is BURN, which suggests a pivot in progress. For budget-conscious users who want fasting plus light fitness, it works.

FastHabit Intermittent Fasting is the best Apple Watch intermittent fasting app for users who already live in the Apple ecosystem and want a clean, native-feeling experience. The 4.75 rating across 13,812 reviews reflects a smaller but loyal audience that values polish over feature breadth.

What sets FastHabit apart is iOS-native execution: Apple Watch complications, iPhone widgets, iCloud sync, HealthKit integration, multi-day fasting support, data export, and calendar views. The 10-day snapshot with streaks visualizes consistency in a way that feels like an iOS feature rather than a SaaS dashboard. The app has been featured in GQ, Guardian, and Fast Company.

Use case: a long-time iOS user who wants a fasting app that respects iOS design conventions, integrates cleanly with Watch and Health, and doesn't try to be a full coaching platform. FastHabit is for users who already know what protocol they want and just need execution.

The tradeoff is feature breadth. No AI scanner, no recipe library, no community. Premium pricing is annual-only and modest, but the free tier is genuinely usable, which is rare. For Apple ecosystem users who value polish over depth, FastHabit is a strong, focused pick.

Fastin: Intermittent Fasting from Bongmi (the same parent as Femometer) is the best intermittent fasting app for community because it combines a straightforward fasting timer with nutrition courses, food tracking, sleep, weight, water, and activity tracking inside one focused interface. The 4.84 rating across 10,163 reviews reflects strong satisfaction in the casual-faster demographic.

What sets Fastin apart is the educational layer aimed at beginners. The fasting and nutrition courses walk new users through the why, not just the how, and the meal journal supports mindful eating habits rather than calorie obsession. Six fasting plans cover the common protocols without overwhelming.

Use case: someone in their twenties or thirties who wants to learn about fasting before committing to a specific protocol, who values short educational courses over endless feature lists, and who appreciates Face ID security for the app.

The tradeoff is the smaller community and the Bongmi family of apps' aggressive subscription pricing — $6.99 weekly or $19.99 quarterly skews high-frequency. The English copy also reveals translation roughness in places. For users who want an educational on-ramp into fasting with a focused interface, Fastin is a credible pick at the mid-tier of the list.

Easy Fast (Fasting Tracker • Easy Fast by Samtark) is the best intermittent fasting app for OMAD and longer fasts because the Pro tier explicitly unlocks 20:4, OMAD (23:1), and multi-day protocols while keeping the core 16:8, 14:10, and 18:6 timer free forever. The 4.96 rating across 7,237 reviews is the highest in this list.

What sets Easy Fast apart is the solo-developer ethos. Sam built Easy Fast as an alternative to bloated apps, with zero ads, no account requirement, and a privacy-first promise that data stays on your device. Pro features (Live Activities, Dynamic Island, Watch app, advanced stats, edit history) support development without gating the core experience.

Use case: an experienced faster doing OMAD or 24-hour-plus fasts who wants a beautiful, fast, private tracker with Lock Screen and Dynamic Island integration. The visual progress rings and stage tracking (ketosis, autophagy) are best-in-class.

The tradeoff is review count — fewer than 10,000 ratings means less statistical signal than Zero or Fastic, even with a near-perfect average. There's also no recipe library or AI scanner. For experienced fasters who want elegant execution and respect for their data, Easy Fast is the standout indie pick for advanced protocols.