A Free Zero Fasting App Alternative

Zero is one of the best-known intermittent fasting apps, and for good reason. If you have been using it and wondering whether there is a free, privacy-first alternative, this comparison lays out where Zero shines, where a simpler app fits better, and how Fasting Tracker stacks up.

What Zero does well

Zero earned its reputation honestly. It combines a reliable fasting timer with one of the largest libraries of fasting content anywhere — articles, expert interviews, and educational material that help you understand what fasting does and why. Its history and statistics screens are polished, and it runs on both iOS and Android.

Zero offers a free tier that covers core timing, with a paid subscription unlocking deeper analytics, personalized programs, and the full content catalog. For people who want to learn while they fast, and who do not mind creating an account, Zero is an excellent product.

Where a lighter alternative fits

Not everyone wants a content platform. Some people just want to start a timer, see how far into a fast they are, and get on with their day. Others are uncomfortable creating an account or syncing personal health data to a server. If either describes you, a smaller, free, offline app may suit you better.

Zero vs Fasting Tracker

What Fasting Tracker offers

Fasting Tracker is a free iPhone app designed for people who want tracking without the overhead. There is no account and no sign-up, and because everything runs offline, all of your data stays on your device rather than on a company server.

The app is built around a circular timer that shows your fasting stages in real time — glucose burning, fat burning, ketosis, and autophagy — so you can see what your body is doing as the hours pass. It supports the standard protocols: 13:11, 16:8, 18:6, 20:4, and OMAD, plus a custom window. You also get weight tracking with charts, streaks to keep momentum, and a full history of past fasts. When a craving hits, a panic-mode breathing exercise helps you get through it without breaking your fast.

Which should you pick?

Choose Zero if you value its deep content library, want cross-platform sync across iOS and Android, and are happy to create an account and consider a subscription for advanced features.

Choose Fasting Tracker if you are on iPhone and want a genuinely free timer that works offline, keeps your data private, and shows your fasting stages clearly — without a subscription or an account.

An honest bottom line

Zero is a strong, feature-rich app, and its educational content is a real differentiator that a lightweight timer cannot match. But that depth comes with an account, cloud sync, and paid tiers for the best features. If you would rather trade the content library for zero cost, full offline use, and on-device privacy, Fasting Tracker is a capable free alternative that covers the tracking essentials well. Many people find the honest test is simple: if you rarely opened Zero's articles anyway, the free option probably gives you everything you actually used.