The 7 Best Intermittent Fasting Apps (2026)

Intermittent fasting is only as easy as the tool you use to track it. The right app removes the guesswork: it starts your clock, shows how far you are into a fast, and keeps a record you can actually learn from. The wrong one buries basic timing behind a subscription wall or a wall of notifications.

Below is an honest look at seven of the most popular intermittent fasting apps in 2026. Each has genuine strengths, and the best pick depends on whether you want coaching, community, or just a clean timer that respects your privacy.

Quick comparison

The apps, reviewed

1. Fasting Tracker — best free, private, and offline

Fasting Tracker is a free iPhone app built around a single idea: fasting tools should not require an account, a subscription, or an internet connection. Every piece of data stays on your device, so there is no sign-up and nothing synced to a server you do not control.

The centerpiece is a circular timer that shows your fasting stages in real time as you move from glucose burning into fat burning, ketosis, and autophagy. It supports the common protocols — 13:11, 16:8, 18:6, 20:4, and OMAD — plus a custom option if you set your own window. Weight tracking with charts, streaks, and full session history round it out, and a "panic-mode" breathing tool helps you ride out cravings without breaking a fast. The main trade-off is scope: it is iPhone-only and focuses on tracking rather than recipes or coaching.

2. Zero — best content library

Zero is one of the most recognizable names in the space. It pairs a solid timer with a deep library of articles and expert-led content, and its history screens surface useful long-term stats. A free tier covers core tracking, while deeper analytics and content sit behind a paid subscription. If you like reading the science while you fast, Zero is a strong choice.

3. Fastic — most beginner-friendly

Fastic wraps fasting in an approachable, colorful interface with step tracking, water logging, and gamified "quests" that nudge you to build habits. It offers a limited free tier and a paid plan for the full experience. Newcomers who want gentle guidance tend to enjoy it.

4. Simple — best AI coaching

Simple leans hard into personalization. Its AI assistant, Avo, answers questions and reacts to what you log, and the app combines fasting with meal and hydration tracking. It typically runs on a free trial followed by a paid subscription. Worth a look if you want conversational feedback rather than a bare timer.

5. Life Fasting Tracker — best for community

Life Fasting Tracker stands out for its social features. You can form "fasting circles" with friends and see everyone's progress in one place, which is genuinely motivating for people who fast better together. It has a generous free tier, with optional paid upgrades.

6. DoFasting — best guided plans

DoFasting focuses on structure: guided fasting schedules, meal suggestions, and simple workouts. It generally uses a trial-then-subscription model. Good for people who want to be told exactly what to do next.

7. BodyFast — best adaptive scheduling

BodyFast builds a weekly plan that adapts over time and can vary your fasting windows day to day. It offers a limited free tier plus a paid coach feature. Handy if a fixed 16:8 every day feels monotonous.

How to choose

• Want coaching or recipes? Simple or DoFasting.
• Want community? Life Fasting Tracker.
• Want a variable schedule? BodyFast.
• Want to read the science? Zero.
• Want a clean, free timer that works offline with no account? Fasting Tracker.

There is no single "best" app for everyone. If your priority is privacy, zero cost, and a timer that clearly shows what your body is doing while you fast, a free offline option is hard to beat. If you want a support system or structured programs, the subscription apps earn their keep.

The bottom line

All seven apps here can track a fast well. Paid apps justify their price with coaching, community, and content; free options win on simplicity and privacy. Try one from each camp for a week and keep whichever one you actually open every morning — the best fasting app is the one you never think about skipping.