Comparison

Fast Slow vs Fast Feast Repeat

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Fast Slow

Understand your body's metabolic changes during fasting with a visual timeline. This free app guides you through different fasting zones, from digestion to deep ketosis, and offers customizable schedules and smart notifications. It provides stats, streaks, and widgets for easy progress tracking.

Highlights
  • 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
Features
Read full description

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. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://cernezan.com/fast-slow/privacy/

About

Fast Feast Repeat

Features
Read full description

With the Fast Feast Repeat app, you can: -Connect with Gin Stephens, author of the New York Times Bestseller Fast Feast Repeat as well as Delay, Don't Deny, 28-Day Fast Start Day by Day, and Cleanish. -Access an ever-growing collection of intermittent fasting resources that you can easily download for listening or watching on the go. -Find your people. Meet and connect with others who are on their own learning journeys. -Join the Eat Like a Grown-up movement through Gin's transformative new program "The Grown-up Year: 52 weeks to listen, play, and nourish." -Complete weekly missions and share your progress. -Collect your insights inside the notes feature. -Have fun while you learn. ▷ Already a Member? Sign-In to access your subscription. ▷ New? Subscribe in the app to get instant access. Fast Feast offers auto-renewing subscriptions. You'll receive unlimited access to content on all your devices. Payment is charged to your account at confirmation of purchase. Pricing varies by location and is confirmed prior to purchase. Subscription automatically renews unless canceled at least 24 hours before the end of the current billing period, or the trial period (when offered). Cancel anytime in Account Settings. For more information see our: -Terms of Service: https://app.fastfeastrepeat.com/pages/terms -Privacy Policy: https://app.fastfeastrepeat.com/pages/privacy

Screenshots

Fast Slow4 screens
Fast Feast Repeat3 screens

Verdict

The call

The clearest difference is device support: Fast Feast Repeat at 3 against Fast Slow's 1. Fast Feast Repeat also leads on iOS requirement (15.0 vs 18.0). On price, update cadence, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Fast Slow sells 4 in-app purchases, starting at $1.99 per 7 days and Fast Feast Repeat sells 2 in-app purchases, starting at $19.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Fast Slow ships an update every 2 weeks, Fast Feast Repeat every 4 weeks. The most recent releases landed on October 17, 2026 and October 10, 2026 respectively.

Scorecard2 real differences · 8 level
Fast Slow versus Fast Feast Repeat: the parameters behind the verdict, then further details
ParameterFast SlowFast Feast Repeat
PriceFreeFree
Rating5.0 (36 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings36 — better—
Update frequencyEvery 2 weeks — betterEvery 4 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree—
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS18.015.0 — better
Further details — not scored
Size23 MB63 MB
Age rating4+4+
DeveloperZan CerneDelay, Don't Deny Social Network, Inc.

In-app purchases

4 purchases

Fast Slow

Subscriptions2
  • Legacy$1.997 Days
  • Legacy - Yearly3 Days trial$12.991 Year
One-time2
  • Buy Me a Coffee$2.99
  • You're Amazing$9.99
2 purchases

Fast Feast Repeat

Subscriptions2
  • Monthly All-Access Membership$19.991 Month
  • Annual All-Access Membership$199.991 Year

Questions

Is Fast Slow free?
Fast Slow is free to download, with in-app purchases available.
Is Fast Feast Repeat free?
Fast Feast Repeat is free to download, with in-app purchases available.
Do Fast Slow or Fast Feast Repeat have ads?
Neither Fast Slow nor Fast Feast Repeat shows ads.
Which is updated more often, Fast Slow or Fast Feast Repeat?
Fast Slow ships an update every 2 weeks, and Fast Feast Repeat every 4 weeks. Most recently, Fast Slow was updated on October 17, 2026 and Fast Feast Repeat on October 10, 2026.

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