Best Intermittent Fasting Apps: Reviews and Comparisons

Quick Answer: The best fasting app depends on what you need. If you want a clean fasting timer, every daily window from 12:12 to one meal a day, streaks and stats without aggressive upselling — and no interest in logging food, because Fasted does not — Fasted is a strong choice. Zero is the most established name and carries a real food tracker. Simple offers AI-powered meal suggestions. BodyFast focuses on personalized weekly plans. No single app is best for everyone — this guide helps you find the right fit.

The intermittent fasting app market has matured significantly. What started as simple countdown timers has evolved into full health platforms with meal tracking, educational content, community features, and AI-driven recommendations.

That's good news for users. It also means there are dozens of options and a lot of marketing noise to cut through. This page provides an honest, feature-by-feature overview of the major fasting apps to help you make an informed decision.

Full disclosure: this site is associated with Fasted. We'll be straightforward about what Fasted does well, what it doesn't, and where competitors may be a better fit for certain users.

What to Look for in a Fasting App

Before comparing specific apps, it helps to know which features actually matter for long-term fasting success. Based on user behavior data and adherence research, these are the features that correlate with sticking to a fasting practice:

Essential features:

• Fasting timer with clear start/stop functionality
• Multiple schedule presets (16:8, 18:6, 20:4, OMAD, custom)
• Progress tracking and history
• Notifications and reminders

Valuable but not essential:

• Weight tracking
• Meal logging
• Stats and insights dashboard
• Streak tracking
• Educational content

Nice to have:

• Community features
• Integration with other health apps
• AI-powered recommendations
• Mood and energy logging

For which of these features the major trackers actually ship, see the seven apps compared side by side.

The Major Fasting Apps in 2026

Fasted

Fasted is built around the idea that a fasting app should do its core job exceptionally well without overwhelming you with features you don't need.

Core features: Fasting timer with six daily windows (12:12, 14:10, 16:8, 18:6, 20:4 and 23:1 for one meal a day) and four extended fasts of 24, 36, 48 and 72 hours; metabolic phase tracking; stats and insights dashboard; streak tracking. Weight tracking and custom protocol lengths sit in Pro. The interface is clean and focused — you open the app, start or check your fast, and get on with your day.

Strengths: It does one job and does the whole of it, from a gentle 12:12 up to a three-day fast, without asking you to log anything. Streak tracking provides motivation without gamifying the experience to the point of anxiety. The stats view shows trends over time, which is more useful than daily snapshots.

Considerations: Fasted does not log food. There is no food database, no calorie count and no photo log at any tier — the only nutrition it records is one entry a day for protein and fibre in grams. It also does not run the weekly protocols: no 5:2, no alternate-day fasting. And it is a newer entrant compared to Zero or Simple, which means a smaller community and less third-party content. If you want a food diary, a weekly protocol, or a large in-app community, another app is the better fit.

Zero

Zero is the most recognized name in fasting apps, having been one of the first dedicated fasting timers on the market. It was co-founded with input from Dr. Peter Attia and has a strong brand association with the science of longevity.

Core features: Fasting timer, fasting history, journal, educational content from medical professionals, and a "Fasting Score" that rates each fast based on duration and consistency.

Strengths: Extensive educational library. The brand credibility is high. The Fasting Score feature provides a simple motivational metric. Zero Plus (premium) adds advanced stats and personalized coaching content.

Considerations: Some users find the free tier limited. The premium subscription is priced at the higher end of fasting apps. The Fasting Score, while motivating, can create pressure to extend fasts beyond what's appropriate.

Simple

Simple positions itself as an AI-powered fasting and nutrition app. It's one of the more feature-rich options, combining fasting tracking with meal logging, water tracking, and personalized recommendations.

Core features: Fasting timer, AI nutrition assistant, meal tracker with food recognition, water tracker, daily insights, and educational content.

Strengths: The AI meal analysis is genuinely useful for people who want nutritional feedback. The onboarding process is thorough, creating a personalized plan based on your goals, experience level, and health information. The interface is polished and approachable.

Considerations: Simple is one of the more expensive fasting apps. The AI features require the premium subscription. Some users report that the onboarding process feels like a long sales funnel. The app does a lot, which can feel overwhelming if you just want a timer.

BodyFast

BodyFast differentiates itself with personalized weekly fasting plans created by what it calls a "Coach" algorithm. Rather than picking a fixed schedule, the app generates a custom plan each week based on your progress and preferences.

Core features: Fasting timer, weekly coaching plans (premium), progress tracking, challenges, and educational content.

Strengths: The weekly plan variation can prevent plateaus and keep the experience fresh. The challenge feature adds social motivation. BodyFast has a large user base, particularly in European markets.

Considerations: The free version is quite limited — the weekly coaching plans require a premium subscription. Some users find the algorithm's plan changes disruptive when they've found a schedule that works. The interface, while functional, feels busier than some competitors.

Fastic

Fastic combines fasting tracking with a strong community element. It includes a social feed where users can share progress, recipes, and motivation.

Core features: Fasting timer, water tracker, step counter, community feed, educational content, and meal suggestions.

Strengths: The community aspect is genuinely engaging for people who are motivated by social accountability. The app includes a broader health tracking approach with water and step tracking. The educational content is presented in bite-sized, accessible formats.

Considerations: The social features can be distracting if you prefer a focused tool. Premium pricing for full feature access. The step counter and water tracker are basic compared to dedicated apps for those functions.

Detailed comparison in Fasted vs Fastic.

Life Fasting Tracker

Life (originally "Life Fasting Tracker") focuses on the science of fasting with features that track which metabolic zone you're in during a fast — fat burning, ketosis, autophagy, etc.

Core features: Fasting timer with metabolic zone tracking, social circles for group fasting, educational content, and integration with Apple Health and Google Fit.

Strengths: The metabolic zone visualization is unique and educational. Social circles allow friends or family to fast together and see each other's progress. The science-forward approach appeals to users who want to understand what's happening in their body.

Considerations: The metabolic zone timelines are estimates based on general research, not personalized biomarker data. The app has undergone several ownership changes, which has affected consistency. The interface feels dated compared to newer competitors.

Free vs Paid: What Are You Actually Getting?

Every major fasting app offers a free tier, but the value varies dramatically. Some free versions are fully functional timers with basic tracking. Others are essentially demos designed to push you toward a subscription.

Here's a general framework for thinking about this:

Worth paying for: Advanced analytics, personalized plans, meal logging with nutritional data, and quality educational content that changes your behavior.

Not worth paying for: Basic timer functionality (this should always be free), access to common fasting schedules, and generic educational articles available elsewhere.

The price range for premium fasting apps runs from about $3/month to $15/month depending on the app and subscription length. Annual plans are typically 40-60% cheaper per month than monthly subscriptions.

Full breakdown in free vs paid fasting apps.

What About Apps with Meal Tracking?

Some users want an all-in-one solution that tracks both fasting windows and nutritional intake. This is a reasonable desire — fasting and nutrition are deeply connected.

Apps that offer integrated meal tracking include Simple (AI food recognition) and Zero, whose listing is now titled "Zero: Fasting & Food Tracker". Fasted is not one of them: it does not log food at any tier, and the only nutrition it records is a daily entry for protein and fibre in grams. Dedicated calorie tracking apps like MyFitnessPal or Cronometer are more powerful for detailed nutritional analysis but don't include fasting timers.

The tradeoff: all-in-one apps sacrifice depth for convenience, while using separate apps gives you better tools but adds friction. Most people do better with a simpler setup they'll actually use.

How to Choose

Here's a practical decision framework:

• You want a clean, focused fasting tool and no food diary at all: Fasted
• You want a food log in the same app as the timer: Zero or Simple
• You want brand credibility and science-backed education: Zero
• You want AI-powered nutrition guidance alongside fasting: Simple
• You want weekly personalized plans that change over time: BodyFast
• You want community and social accountability: Fastic
• You want to understand fasting science and metabolic zones: Life

The best app is the one that helps you fast consistently. Try the free versions of two or three that appeal to you, use them for a week each, and commit to the one that fits your workflow.

For our annual roundup, see best intermittent fasting app 2026 and best fasting timer app.

How Fasted Helps

Fasted was designed with a simple philosophy: your fasting app should make fasting easier, not become another source of complexity. The timer carries every daily window from 12:12 to one meal a day, and extended fasts of 24, 36, 48 and 72 hours above them, with custom lengths on the Pro tier. Weight tracking, also in Pro, lets you see how the window relates to the scale. Streak tracking keeps you motivated, and the insights dashboard helps you spot trends over time. There is no food log, and that is a decision rather than an omission: it is a focused tool that does what a fasting app should do — help you fast consistently and see your progress.

If you're new to fasting, start with our getting started guide. For tips on fitting fasting into your daily routine, visit our lifestyle pillar.

Frequently Asked Questions

Do I need a fasting app to do intermittent fasting?

No. You can fast with nothing more than a clock. However, research on health behavior change consistently shows that tracking improves adherence. A fasting app reduces friction by automating the tracking, providing reminders, and showing you patterns you might not notice otherwise.

Are paid fasting apps worth the money?

It depends on what you're paying for. If premium features like detailed analytics, meal tracking, or personalized plans help you stay consistent, the cost is likely worthwhile compared to the health benefits of sustained fasting. If you only need a basic timer, most free tiers are sufficient.

Can I use a regular timer instead of a fasting app?

You can, but you lose the tracking history, pattern recognition, and progress visualization that make fasting apps valuable. Seeing your streak, reviewing your fasting history, and watching weight trends alongside fasting data provides context that a phone timer cannot.

Which fasting app is best for beginners?

Apps with good onboarding experiences and educational content — like Simple and Zero — are strong choices for beginners. Fasted is also beginner-friendly due to its clean interface and straightforward setup. The most important thing is choosing an app that doesn't overwhelm you with features before you've established a basic fasting habit.