FastLyfe vs WaterFast
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FastLyfe
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FastLyfe: Fasting Tracker & Timer FastLyfe is an easy-to-use fasting tracker designed to help you stay consistent and build better habits. Track your fasts, follow popular fasting schedules, and monitor your progress over time—all in one simple app. Features: Fasting timer to track your sessions Popular protocols like 16:8, 18:6, and OMAD Custom fasting schedules Progress tracking and history Calendar view to see your consistency Clean and simple design FastLyfe is built for anyone looking to stay on track with intermittent fasting without distractions or unnecessary complexity.
WaterFast
This app provides a synchronized intermittent fasting timer designed for seamless use across your iPhone and Apple Watch. It offers detailed insights into fasting zones and hydration tracking, with a focus on privacy and a user-friendly experience.
- Synchronized iPhone and Apple Watch timer
- Fasting zone insights
- Hydration tracking
- Multiple fasting plans
- Streak calendar
- Data export
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Some fasting apps charge many times more. WaterFast is a fraction of that — with a 3-day free trial on every plan. You decide. FASTING APPS HAVE A PROBLEM They're either overpriced, bloated with social feeds and AI coaching you never asked for — or they're simple but their Apple Watch app runs a separate countdown that drifts out of sync with your iPhone. Two timers for the same fast. Not optimal. WATERFAST IS DIFFERENT One timer. One source of truth. Your Watch doesn't follow your iPhone — it leads. Start, monitor and end your fast right from your wrist, even with your iPhone in your pocket. When you pick it up, everything matches. Always. To the second. TRY IT ALL FREE FOR 3 DAYS Start a 3-day free trial and unlock everything — no strings attached. Then keep it monthly, yearly, or one-time lifetime. Cancel anytime. EVERYTHING INCLUDED • Every plan: 16:8, 18:6, 20:4, OMAD, 5:2 and fully custom • Start & stop fasts from Apple Watch — it leads, iPhone follows • Live timer with progress ring and fasting zones • Streak calendar — don't break the chain, unlimited history • All Apple Watch complications (circular, corner, inline, rectangular) • Hydration tracking with one-tap logging and daily goal • Full stats: current streak, longest fast, total hours, success rate • Export your data as CSV • No account required BUILT FOR APPLE WATCH — REALLY Most fasting apps treat the Watch as an afterthought. WaterFast was designed wrist-first. The timer state lives in one shared place: start a fast on your Watch during dinner, check the zone on your iPhone the next morning — same fast, same seconds, zero drift. KNOW YOUR FASTING ZONES Track exactly what's happening in your body — from digestion through fat burning and ketosis to autophagy. Each zone explained in plain language, with science-based hour ranges. Educational reference only — not medical advice. HYDRATION, ON YOUR WRIST Log a glass of water with one tap on your Watch, with haptic confirmation, synced instantly to your iPhone and Apple Health. A PRICE THAT RESPECTS YOU WaterFast PRO: monthly, yearly, or one-time lifetime. Every plan starts with a 3-day free trial. We think a fasting timer shouldn't cost more than your streaming service. PRIVATE BY DESIGN No account. No ads. No tracking. Your fasting and hydration data never leaves your device (except to your own Apple Health, if you choose). Start your 3-day free trial and run your first fast in under a minute. --- Medical disclaimer: WaterFast provides educational information about fasting. It is not medical advice. Consult your healthcare provider before starting any fasting protocol, especially if you have a medical condition, are pregnant, or take medication. --- Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: WaterFast at weekly against FastLyfe's every 6 weeks. FastLyfe's advantage is iOS requirement (13.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. FastLyfe sells 3 in-app purchases, starting at $5.99 per month and WaterFast sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.
FastLyfe ships an update every 6 weeks, WaterFast weekly. The most recent releases landed on October 20, 2026 and October 6, 2026 respectively.
| Parameter | FastLyfe | WaterFast |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 6 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, Apple Watch |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 31 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Cayden Williams | LUIS ORLANDO LAZO GONZALEZ |
In-app purchases
FastLyfe
- Monthly3 Days trial$5.991 Month
- Yearly$16.991 Year
- Lifetime Pro$29.99
WaterFast
- WaterFast PRO Yearly$9.991 Year
- WaterFast PRO Lifetime$24.99









