Fasty vs AllyFast
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fasty
This app helps users track intermittent fasting by monitoring fasting days and eating periods. It supports weight tracking in both pounds and kilograms and does not collect user data.
- Intermittent fasting tracking
- Weight tracking
- Fasting day monitoring
- Eating period logging
- Pound and kilogram support
- No data collection
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Fasty: the Fasting Tracker helps you track your weight, the days you fast, and when you eat on non-fasting days (intermittent fasting). Fasty doesn't track any of your data, is free, and supports pounds and kilograms.
AllyFast
This app offers a streamlined fasting timer with a clean, SwiftUI-based interface. It prioritizes user privacy with local data storage and provides science-based insights into fasting stages. Enjoy a clutter-free, ad-free experience with no subscriptions.
- SwiftUI fasting timer
- Local data storage
- No subscriptions or ads
- Fasts up to 72 hours
- Editable fasting history
- Science-based fasting insights
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AllyFast is a beautifully crafted intermittent fasting timer built with SwiftUI. Clean, lightweight, and privacy-first. Whether you follow 16:8, 18:6, 20:4, OMAD, or extended fasts, AllyFast keeps your fasting journey simple and focused. Why AllyFast? • No subscriptions. One-time $0.99. Yours forever. • 100% private. All data stays on your device. • No ads, no trackers, no accounts, no clutter. • Ultra lightweight at just 1.7 MB. Key Features • Beautiful fasting timer with smooth SwiftUI animations • Supports intermittent fasting plans: 12:12, 14:10, 16:8, 18:6, 20:4, OMAD • Extended fasts up to 72 hours • Editable fasting history with color-coded goal tracking • Science-based fasting stage insights (fed state, ketosis, autophagy, and more) • Unlimited local import and export of your fasting data • Polished for iOS 26 Liquid Glass • Full Dark Mode support Perfect Privacy Your fasting data never leaves your iPhone. No cloud sync, no servers, no tracking. Just you and your fast. Built for Everyone From beginners exploring their first 16:8 fast to experienced fasters tracking multi-day autophagy windows, AllyFast adapts to your goals without getting in the way. No cloud. No noise. Just fasting.
Screenshots
Verdict
The clearest difference is price: Fasty at Free against AllyFast's $0.99. Fasty also leads on iOS requirement (14.0 vs 18.2). AllyFast's advantage is update cadence (monthly vs every 16 months). On rating, review sentiment, ratings volume and ads 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
Fasty is free to download; AllyFast costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.9 for Fasty against 5.0 for AllyFast. Both are backed by a comparable volume of ratings — 7 and 18 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Fasty ships an update every 16 months, AllyFast monthly. The most recent releases landed on October 1, 2026 and October 16, 2026 respectively.
| Parameter | Fasty | AllyFast |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.9 (7 ratings) | 5.0 (18 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 7 | 18 — better |
| Update frequency | Every 16 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 18.2 |
| Further details — not scored | ||
| Size | 2 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Forest and the Trees, LLC | Wonseok Lee |
Customer experience
Fasty
AllyFast
In-app purchases
Fasty
No in-app purchases
AllyFast
No in-app purchases
