Fast Slow vs Hush
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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/
Hush
This app offers a quiet and focused intermittent fasting timer. It provides essential features like a center ring timer, preset fasting schedules, and helpful hints during fasting periods. Users can also utilize a home screen widget for at-a-glance tracking and enjoy a privacy-first approach with on-device data storage.
- Center ring timer
- Four classic fasting presets
- Hunger-peak hint notifications
- Home screen widget
- Streak tracking
- Privacy-first data storage
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Hush is a quiet, focused intermittent fasting (IF) timer designed for people tired of the noise. No subscriptions. Minimal notifications. One-time ad removal only. Built so you can keep going. WHO IT'S FOR - People tired of Zero / Fastic / BodyFast's subscription gates and notification spam - Anyone running 16:8, 18:6, 20:4, or 24h at their own pace - Those who want a home screen widget for at-a-glance remaining time - People who appreciate short, supportive hints during the hardest hours - Anyone who hates subscriptions and just wants a one-time ad removal CORE FEATURES ■ Center ring timer Industry-standard circular progress. Remaining time, start and predicted end at a glance. ■ Four classic presets 16:8 (the daily staple) / 18:6 (a touch more) / 20:4 (Warrior) / 24h (OMAD) ■ Hunger-peak hint notifications At 8h, 10h, and 12h into your fast (the toughest stretches), a short hint quietly arrives. "Sip some water." "Take three deep breaths." "You're almost there." One-tap to turn it off. ■ Home screen widget Small and Medium widgets show your remaining time without opening the app. ■ Streaks and a quiet "well done" Hit your goal and a full-moon icon shows up with a quiet congratulations. Streak counted. Calm acknowledgment, not pressure. ■ Privacy first Your fasting records stay on device. iCloud sync is optional. PRICING Download and all features are free. A one-time Plus purchase removes ads forever and unlocks custom plans, Insights, and Apple Watch sync. No subscriptions. DISCLAIMER Hush is a timer app, not medical advice. If you are pregnant, nursing, taking medication, or have a medical condition, please consult your doctor before starting any fasting protocol. PRIVACY & SUPPORT https://kureho.app/apps/iftimer
Screenshots
Verdict
The clearest difference is ads: Fast Slow at none against Hush's shown. Fast Slow also leads on monetization model (free vs free with in-app purchases). Hush's advantage is update cadence (every 2 days vs every 2 weeks) and iOS requirement (16.0 vs 18.0). On price, review sentiment, in-app purchases and device support 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
Both are free to download. Fast Slow sells 4 in-app purchases, starting at $1.99 per 7 days and Hush sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Fast Slow ships an update every 2 weeks, Hush every 2 days. The most recent releases landed on October 24, 2026 and October 13, 2026 respectively.
| Parameter | Fast Slow | Hush |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (39 ratings) — better | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 39 — better | — |
| Update frequency | Every 2 weeks | Every 2 days — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone | iPhone, Apple Watch — better |
| Requires iOS | 18.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 23 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Zan Cerne | KUREHO |
Customer experience
Fast Slow
Hush
In-app purchases
Fast Slow
- Legacy$1.997 Days
- Legacy - Yearly3 Days trial$12.991 Year
- Buy Me a Coffee$2.99
- You're Amazing$9.99
Hush
- Remove Ads$1.99
- Plus$11.99









