The Best Free Intermittent Fasting App
Without Subscription (2026)

Why Most Fasting Apps Are Frustrating

If you've downloaded a fasting app recently, you've probably hit all of these:

• Subscription paywalls hiding basic features like custom fasting durations
• Mandatory onboarding quizzes asking about weight goals, activity levels, and dietary preferences before you can see a timer
• Forced account creation — email, password, the lot — before you've tracked a single fast
• Coaching upsells at £7–15/month you never wanted
• Feature bloat — meal plans, recipes, water tracking, step counting, community challenges — when all you want is to know when you can eat

For people who simply want to track intermittent fasting without the extras, this is exhausting.

The FastWindow Philosophy: Just Track Your Fast

FastWindow is an intermittent fasting timer app that does one thing exceptionally well: it shows you how long you've been fasting and when you can eat.

No quiz. No account. No subscription. No bloat.
Open the app → Tap start → See your fasting progress.

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Key Features

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Free vs Pro: What You Get

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FastWindow vs. Other Fasting Apps

The key trade-off: FastWindow doesn't offer coaching, meal plans, or community features. If you need those, Zero or Fastic might be worth paying for. If you just want a reliable fasting timer without a monthly bill — FastWindow is the clear choice.

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Who FastWindow Is For (And Who It's Not For)

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How to Use FastWindow: Step by Step

1. Download FastWindow — free on the App Store. No account, no email signup. Install and launch.
2. Choose your fasting schedule — 16:8 for beginners, 18:6 for intermediate, 20:4 for advanced, OMAD for 23-hour fasts, or Custom (Pro) for any duration.
3. Tap "Start Fast" — the timer begins immediately. That's it.
4. Watch your progress — elapsed time counts up, remaining time counts down. You always know exactly when you can eat.
5. Get notified when your eating window opens — a local notification fires when your fast ends.
6. Review your history — the 7-day calendar shows your patterns and streaks. Pro unlocks unlimited history and advanced stats.

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Why "No Subscription" Matters

The average person now pays for 12+ subscriptions per month. Streaming, cloud storage, productivity tools, fitness apps. Adding £7–15/month for an app that is, at its core, a timer — feels wrong.

FastWindow's answer: pay £4.99 once for Pro, or use the free tier forever. For the cost of one month of a competitor's subscription, you get lifetime access.

No renewal emails. No "your subscription is renewing" notification at 3am. No annual price increases. You pay once, it's yours.

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Privacy: Why Local-First Matters for Health Data

Most intermittent fasting apps sync your data to their servers: fasting start and end times, weight measurements, health goals, activity patterns. You're trusting a third party with sensitive health information — and if that company folds or gets acquired, your data goes with it.

FastWindow takes the opposite approach:

• No account creation — no email, password, or profile required
• No cloud sync — all data stays on your device
• No analytics — no tracking pixels or behaviour monitoring
• Works offline — no internet connection needed

Your fasting data is yours alone. FastWindow never sees it.

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Common Fasting Questions FastWindow Answers

How long have I been fasting?
The elapsed timer shows your exact fasting duration to the minute.

When can I eat?
The remaining time display shows exactly when your eating window opens. No guesswork, no mental arithmetic.

Am I staying consistent with my 16:8 schedule?
The 7-day fasting calendar and heatmap show your patterns and streaks at a glance.

What's my average fasting length?
FastWindow Pro includes advanced stats — average fast duration, longest streak, and more.

Can I track my weight alongside my fasts?
Yes — Pro includes a weight log with trend visualisation and Apple Health export.