Comparison

Fast Slow vs Easy Fast

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.

About

Easy Fast

This app simplifies intermittent fasting with easy timers and progress tracking. It offers customizable plans, integrates with Apple Health for weight monitoring, and provides motivating feedback upon completion of fasts.

Highlights
  • One-tap start/stop fasting
  • Customizable fasting plans
  • Progress visualization
  • Weekly statistics and streaks
  • Weight tracking via Apple Health
  • Apple Watch app for wrist control
  • Haptic feedback and confetti motivation
Features
Read full description

Make intermittent fasting simple, sustainable, and effective. Easy Fast helps you start, monitor, and complete your fasts with clear timers, meaningful insights, and motivating feedback. Why you’ll like it Start/stop in one tap Control fasting from iPhone and Apple Watch with automatic sync. Ready-made or custom plans Begin with 16:8 or customize duration and schedule, even per weekday. Clear central card See progress at a glance with remaining/elapsed time and your target. Weekly statistics Rings and bar charts show streaks, totals, and target hits. Weight tracking with Apple Health Read and write weight to Health and visualize your progress over time. Motivation that sticks Haptic feedback and confetti when you finish a fast at your target. Apple Watch A dedicated Watch app to start/stop fasting from your wrist, view the countdown, and quickly edit the start time. Privacy & Control You decide what to share. Easy Fast only reads the Apple Health data you allow, and you can change permissions at any time. Requirements Works with data from Apple Health. For best results, wear Apple Watch during day and sleep to capture HRV, heart rate and sleep. Disclaimer Easy Fast provides wellness insights and is not a medical device. It does not diagnose or treat health conditions. Privacy policy: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms of use: https://backoffice.nicolaeusebi.com/Legal/PrivacyEasy

Screenshots

Fast Slow4 screens
Easy Fast4 screens

Verdict

The call

The clearest difference is review sentiment: Fast Slow at 100% against Easy Fast's 50%. Fast Slow also leads on rating (5.0 vs 4.6) and monetization model (free vs free with in-app purchases). On price, ratings volume, update cadence 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

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 Easy Fast sells 4 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Fast Slow holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 22 and 13 respectively. Written reviews point the same way: 100% of Fast Slow's written reviews are positive against 50% of Easy Fast's.

UpkeepUpdate frequency

Fast Slow ships an update fortnightly, Easy Fast every 2 weeks. The most recent releases landed on September 13, 2026 and September 17, 2026 respectively.

Scorecard3 real differences · 7 level
Fast Slow versus Easy Fast: the parameters behind the verdict, then further details
ParameterFast SlowEasy Fast
PriceFreeFree
Rating5.0 (22 ratings) — better4.6 (13 ratings)
Positive reviews100.0% of reviews — better50.0% of reviews
Number of ratings22 — better13
Update frequencyFortnightlyEvery 2 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhoneiPhone, Apple Watch — better
Requires iOS18.017.0 — better
Further details — not scored
Size19 MB26 MB
Age rating4+4+
DeveloperZan CerneNicola Eusebi

Customer experience

Fast Slow

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Easy Fast

All ratings13 ratings
Positive84.6%
Neutral7.7%
Negative7.7%
Written reviews2 reviews
Positive50.0%
Neutral50.0%
Negative0.0%

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
4 purchases

Easy Fast

Subscriptions4
  • Premium Monthly$3.991 Month
  • Premium Monthly$4.991 Month
  • Premium Yearly7 Days trial$19.991 Year
Show 1 more
  • Premium Yearly7 Days trial$29.991 Year

Questions

Is Fast Slow free?
Fast Slow is free to download, with in-app purchases available.
Is Easy Fast free?
Easy Fast is free to download, with in-app purchases available.
Which has better reviews, Fast Slow or Easy Fast?
Fast Slow is rated higher. Fast Slow averages 5.0 out of 5 from 22 ratings, while Easy Fast averages 4.6 from 13 ratings.
Do Fast Slow or Easy Fast have ads?
Neither Fast Slow nor Easy Fast shows ads.
Which is updated more often, Fast Slow or Easy Fast?
Fast Slow ships an update fortnightly, and Easy Fast every 2 weeks. Most recently, Fast Slow was updated on September 13, 2026 and Easy Fast on September 17, 2026.

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