Comparison

Fast Slow vs Nomu

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

Nomu

This app simplifies intermittent fasting with a user-friendly timer and progress tracker. It offers popular fasting plans, visual feedback on fasting phases, and a cute companion to keep you motivated. Track your water intake, weight, and BMI with insightful charts.

Highlights
  • Customizable fasting plans
  • Live fasting phase tracking
  • Streak and progress tracking
  • Water intake monitoring
  • Weight and BMI logging
  • Adorable companion character
Features
Read full description

Nomu is a beautifully designed intermittent fasting timer that makes healthy habits feel effortless. Whether you're new to fasting or a seasoned pro, Nomu keeps things simple, motivating, and fun. Try Nomu free for 7 days. After that, Nomu Pro is a monthly or yearly subscription, and you can cancel anytime. FASTING MADE SIMPLE Choose from popular plans like 16:8, 18:6, 20:4, OMAD, or go deep with extended fasts up to 72 hours. Start your fast with one tap and watch your progress in real time with a gorgeous timer ring. FAST FROM YOUR WRIST The Nomu Apple Watch app lets you start, stop, and track your fast on the go — your current phase and progress are always a glance away. TRACK YOUR PROGRESS - Live fasting phases: fat burning, ketosis, autophagy, deep autophagy, and immune renewal - Streak tracking to build consistency day after day - Weight and height logging with automatic BMI calculation - Progress photos to see your visual transformation - Body measurements: waist, hips, chest, arms, and thighs - Dedicated water screen with drink-type tracking - Supplement tracking with reminders MEET NOMU Your adorable fasting companion evolves as you progress through each phase — from caterpillar to butterfly. Nomu celebrates your wins and keeps you company during those tough fasting hours. Unlock 8 wing evolution stages over 180 days. SET YOUR GOALS Define your target weight and timeline. Watch your progress ring fill as you get closer. Nomu tracks the delta so you always know where you stand. LEARN AS YOU FAST Explore the Learn library to understand the science behind every phase — fat burning, ketosis, autophagy, and more — in simple, friendly language. NOMU PRO Unlock premium features including progress photos, weight goals, body measurements, supplement tracking, advanced insights, data export, and custom accent colors. Nomu Pro is a monthly or yearly subscription after your 7-day free trial, or a one-time lifetime purchase. Cancel anytime in App Store settings. INSIGHTS THAT MATTER Weekly and monthly recaps, fasting history, water trends, weight progress, and advanced stats like your best fasting day and longest fast — all in one place. BUILT FOR YOU - Extended fasting plans: 24h, 36h, 48h, and 72h - Apple Watch app - Home and Lock Screen widgets - Apple Health sync - Export your data anytime (CSV or JSON) - Persistent notification showing your fasting status - Auto-start eating window countdown - Dark and light mode - 8 custom accent colors - 14 languages supported - Privacy first: all data stays on your device Start your fasting journey with Nomu today. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.tappect.com/apps/nomu/privacy

Screenshots

Fast Slow4 screens
Nomu4 screens

Verdict

The call

The clearest difference is review sentiment: Fast Slow at 100% against Nomu's 86%. Fast Slow also leads on rating (5.0 vs 4.8). Nomu's advantage is update cadence (every 5 days vs every 2 weeks) and device support (4 vs 1). On price, ratings volume, 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 Nomu sells 5 in-app purchases, starting at $2.99 per 7 days. 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 4.8. Both are backed by a comparable volume of ratings — 39 and 97 respectively. Written reviews point the same way: 100% of Fast Slow's written reviews are positive against 86% of Nomu's.

UpkeepUpdate frequency

Fast Slow ships an update every 2 weeks, Nomu every 5 days. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

Scorecard5 real differences · 5 level
Fast Slow versus Nomu: the parameters behind the verdict, then further details
ParameterFast SlowNomu
PriceFreeFree
Rating5.0 (39 ratings) — better4.8 (97 ratings)
Positive reviews100.0% of reviews — better85.7% of reviews
Number of ratings3997 — better
Update frequencyEvery 2 weeksEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreeFree
DevicesiPhoneiPhone, iPad, iPod, Apple Watch — better
Requires iOS18.015.0 — better
Further details — not scored
Size23 MB84 MB
Age rating4+4+
DeveloperZan CerneTappect LLC

Customer experience

Fast Slow

All ratings36 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Nomu

All ratings97 ratings
Positive95.9%
Neutral3.1%
Negative1.0%
Written reviews21 reviews
Positive85.7%
Neutral4.8%
Negative9.5%

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
5 purchases

Nomu

Subscriptions4
  • Nomu Pro Weekly7 Days trial$2.997 Days
  • Nomu Pro Monthly7 Days trial$9.991 Month
  • Nomu Pro Yearly$19.991 Year
Show 1 more
  • Nomu Pro Yearly7 Days trial$29.991 Year
One-time1
  • Nomu Pro Lifetime2 variants$49.99

Questions

Is Fast Slow free?
Fast Slow is free to download, with in-app purchases available.
Is Nomu free?
Nomu is free to download, with in-app purchases available.
Which has better reviews, Fast Slow or Nomu?
Fast Slow is rated higher. Fast Slow averages 5.0 out of 5 from 39 ratings, while Nomu averages 4.8 from 97 ratings.
Do Fast Slow or Nomu have ads?
Neither Fast Slow nor Nomu shows ads.
Which is updated more often, Fast Slow or Nomu?
Fast Slow ships an update every 2 weeks, and Nomu every 5 days. Most recently, Fast Slow was updated on October 24, 2026 and Nomu on October 31, 2026.

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