# Fast Slow - Fasting Tracker — Intermittent 16:8 Free Timer > Free intermittent fasting tracker with metabolic zone visualization and smart features. (iPhone/iPad app by Zan Cerne.) - Source: https://appshunter.io/ios/app/fast-slow-fasting-tracker/id6749188352 (this page in markdown: same URL + `.md`) - Developer: [Zan Cerne](https://appshunter.io/developer/1747198932) - Category: Health & Fitness, Utilities - Price: Free with in-app purchases - Rating: 5.00/5 from 22 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 18.0 · 19 MB - Languages: English - Released: 2025-08-22 - Data updated: 2026-08-31 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/fast-slow-fasting-tracker/id6749188352/reviews.md ## What is Fast Slow? See what happens inside your body as you fast. Fast Slow walks you through 5 fasting zones, from digestion through fat burning to deep ketosis, so you understand what every hour of your fast is doing. 100% free. Every feature. No ads. No paywalls. No trackers. Free forever. WHAT MAKES FAST SLOW DIFFERENT Most fasting apps just count down a timer. Fast Slow shows you what's actually happening in your body at each stage: - Anabolic (0-4h): Digesting and storing nutrients - Catabolic (4-8h): Tapping into energy reserves - Fat Burning (8-12h): The metabolic switch - Ketosis (12-16h): Ketones and cellular cleanup - Deep Ketosis (16h+): Deep cellular renewal Tap any zone to learn more about the science behind it. 100% FREE. EVERY FEATURE INCLUDED. No premium tier. No trial that expires. No paywall gates. Every feature in Fast Slow is yours from day one: - All 6 fasting schedules - All stats, streaks, and trends - All widgets (Home Screen and Lock Screen) - All notifications - Siri Shortcuts - iCloud sync - Data export Everything free. No catches. FEATURES Fasting Timer One tap to start. One tap to stop. A visual timeline shows where you are, what zone you're in, and what comes next. 6 Fasting Schedules 12:12 for beginners, 14:10, 16:8 (the most popular), 18:6, 20:4, and OMAD (one meal a day) for experienced fasters. Visual Timeline Color-coded timeline of your fasting and eating windows. Plan meals, training, and recovery at a glance. Smart Notifications 7 notification types: goal reached, halfway there, one hour left, eating window alerts, and a custom last meal reminder. Nudges, not nags. Stats & Streaks Total fasts, average duration, personal records, weekly trends, and a monthly fasting calendar. Small wins add up. Widgets Home Screen and Lock Screen widgets with progress rings, timelines, and live timers. Check your fast without opening the app. Siri Shortcuts "Hey Siri, start my fast." Start, stop, and check your fasting status hands-free. AI-Powered Greetings On supported devices, Apple Intelligence creates personalized messages based on your fasting progress, streak, and time of day. iCloud Sync Your fasting data syncs automatically across all your devices. Data You Own Export your fasting history as JSON. Delete everything with one tap. Your data, your choice. DESIGNED FOR REAL LIFE Pick a schedule, adjust as needed, and let Fast Slow handle the timing. New to fasting or already have a routine, it works either way. Structure when you want it, out of the way when you don't. Built by one developer who fasts every day. No corporate agenda. No growth hacking. A well-made tool that respects your time and your data. RESPONSIBLE APPROACH Intermittent fasting can support weight management, energy, and focus, but results vary. Fast Slow provides tools and information, not medical advice. If you have health conditions, are pregnant, or have a history of eating disorders, please talk to a healthcare professional before starting. ## Key features - Fasting timer with visual timeline - 6 customizable fasting schedules - 5 distinct fasting zones explained - Smart notifications for fasting windows - Stats, streaks, and trends tracking - Home and Lock Screen widgets - Siri Shortcuts integration ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Legacy - Yearly | $12.99 | per year | | Legacy | $1.99 | per 7 days | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | You're Amazing | $9.99 | one-time | | Buy Me a Coffee | $2.99 | one-time | ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/fast-slow-fasting-tracker/id6749188352/reviews.md ### 5/5 — Easy fasting app *2026-06-16* I found this app when I wanted to start tracking my intermittent fasting journey. I didn’t have to buy a subscription and it was so easy to track my fasting times and adjust them if necessary. It also keeps a history which I find very useful. I love this app I would definitely recommend it! **Developer response:** That's amazing! Thank you so much for the kind words. ### 5/5 — Very good *2026-06-16* Been using this for 66 days after my old fast app stopped working. I love how nothing cost money and it shows the different zones my body is in during my fast. Overall great! I recommended to others and they now use it also. **Developer response:** Thank you so much! As an indie developer, I really appreciate it! I'm glad you find it useful. ### 5/5 — Great fasting app *2026-04-27* Simple but has everything I need to fast. The little motivational blurb helps me everyday push through. **Developer response:** Thank you so much! This means a lot. I'm really glad you're enjoying the app. ## Frequently asked questions about Fast Slow ### Does Fast Slow have ads? No, Fast Slow is completely free with no ads. The developer has stated it is ad-free forever, with every feature included without paywalls or trackers. ### What fasting schedules does Fast Slow offer? Fast Slow provides 6 fasting schedules: 12:12, 14:10, 16:8, 18:6, 20:4, and OMAD (one meal a day). Users can pick a schedule and adjust it as needed. ### How does Fast Slow explain fasting zones? Fast Slow walks users through 5 fasting zones: Anabolic (0-4h), Catabolic (4-8h), Fat Burning (8-12h), Ketosis (12-16h), and Deep Ketosis (16h+). Each zone is explained with its scientific basis. ### Can I track my progress with Fast Slow? Yes, Fast Slow offers stats and streaks, including total fasts, average duration, personal records, weekly trends, and a monthly fasting calendar. This helps users monitor their progress and celebrate small wins. ### What devices is Fast Slow available on? Based on the provided data, Fast Slow is currently supported on iPhone. It also features iCloud sync for seamless data across Apple devices. ### How often is Fast Slow updated? The app was last updated on April 26, 2026, indicating ongoing development and support. The latest version is 2.1.2. ### Is Fast Slow suitable for beginners? Yes, Fast Slow is designed for real life and works for both new and experienced fasters. It offers schedules like 12:12, which is suitable for beginners, and guides users through the process. ### Can I export my data from Fast Slow? Yes, Fast Slow allows users to export their fasting history as JSON data. Users also have the option to delete all their data with a single tap, emphasizing data ownership. ## Version history (last 5 releases) ### 2.2.1 — 2026-06-15 Fixes an issue where fasting history could appear missing and new fasts couldn't be started after updating. Your data is safe and restored automatically. ### 2.1.2 — 2026-04-26 Request and vote on features. Share ideas and upvote what you want next, right from Settings. Your voice shapes what comes next. Behind the scenes we tightened up sync, scheduling, and stats so the app feels quicker and steadier. Thanks for fasting with us. ### 2.0 — 2026-03-20 Fast Slow 2.0 is now 100% free. No premium tier, no paywalls, no ads. Every feature, stat, and widget is yours at no cost. New in this version: - Home Screen and Lock Screen widgets - Streak tracking with monthly calendar - Weekly trend charts - Improved timeline with smoother visuals - Better notification timing - Performance and stability improvements Thank you for fasting with Fast Slow. ### 1.0.9 — 2025-11-25 In this version of Fast Slow we've: - added set to now button when editing fast - fixed saving fasting goal Thank you for your support! ### 1.0.8 — 2025-11-03 In this version of Intermittent Fasting Tracker includes: - smaller improvements - improved onboarding flow ## Apps similar to Fast Slow | App | Rating | Price | Category | | --- | --- | --- | --- | | [Easy Fast - Fasting Tracker](https://appshunter.io/ios/app/easy-fast-fasting-tracker/id1645249078) | 4.5 (214) | Free | Health & Fitness | | [Fast Feast Repeat](https://appshunter.io/ios/app/fast-feast-repeat/id6754365660) | — | Free | Health & Fitness | | [Fasty - Intermittent Fasting](https://appshunter.io/ios/app/fasty-intermittent-fasting/id6744280079) | 4.7 (1,506) | Free | Health & Fitness | | [Fasting Tracker: Freedom Fast](https://appshunter.io/ios/app/fasting-tracker-freedom-fast/id6761208711) | 4.9 (21) | Free | Health & Fitness | | [Yoa Health & Workout Tracker](https://appshunter.io/ios/app/yoa-health-and-workout-tracker/id6642662318) | 4.9 (57) | Free | Health & Fitness | | [Fitness Story](https://appshunter.io/ios/app/fitness-story/id6748090363) | 4.9 (42) | Free | Health & Fitness | ## More apps by Zan Cerne - [Tumpkoti](https://appshunter.io/ios/app/tumpkoti/id6502881130) - [Ice Breath: Energize & Focus](https://appshunter.io/ios/app/ice-breath-energize-and-focus/id6736895319) - [Avtobusnik: Prihodi LPP bus](https://appshunter.io/ios/app/avtobusnik-prihodi-lpp-bus/id6737699006) All apps by Zan Cerne: https://appshunter.io/developer/1747198932 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*