Comparison

Fast Slow vs Jihora

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

Jihora

Features
Read full description

Jihora turns intermittent fasting into visible progress — a rhythm you can actually keep, and proof that it's working. SEE YOUR GOAL DATE From your very first week, Jihora projects when you'll reach your goal weight — with 30- and 90-day forecasts that update every time you weigh in. WATCH YOUR CONSISTENCY CLIMB A daily 0–100 consistency score (Elite, Excellent, Strong…) built from your completion rate, streaks, frequency, and routine — so you always know if you're on track. Follow your streaks and a fasting heatmap, too. MONTHLY TRANSFORMATION REPORTS Every month, see your total fasting hours, average and longest fast, weight lost, best week, and consistency score — in one card you can share. TRACK EVERYTHING IN ONE CALM SCROLL • Fasting timer with start/end editing and a Lock Screen Live Activity • Water, weight, meals, and exercise logs • Body progress photos (kept private on your device) • Weekly routine planner UNDERSTAND YOUR BODY See what's happening at each fasting stage, and get encouragement that adapts to your fasting hours, weight trend, and hydration — not just numbers. PRIVATE BY DESIGN • No account, no ads, no tracking • Your data stays on your device and your own iCloud BONUS: SMART EXTRAS Snap a photo for calorie analysis and get personalized coach notes. On supported devices this runs on-device with Apple Intelligence — for free; or add your own Google Gemini key. JIHORA PRO Unlock goal projections, advanced progress analytics, monthly transformation reports, the fasting heatmap, and premium widgets. Try Pro free for 7 days — no payment required, no card needed. After that, Pro is a single purchase. There is no subscription, nothing renews, and there is nothing to cancel. You pay once and keep every feature for the life of the app. Terms of Use (EULA): https://leejiho7575275.github.io/jihora-legal/terms.html Privacy Policy: https://leejiho7575275.github.io/jihora-legal/ Jihora does not provide medical advice. Intermittent fasting may not be suitable for everyone — please see the in-app safety notice and consult a professional if needed.

Screenshots

Fast Slow4 screens
Jihora4 screens

Verdict

The call

Fast Slow and Jihora are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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 Jihora sells 3 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Fast Slow ships an update every 2 weeks, Jihora weekly. The most recent releases landed on October 17, 2026 and October 6, 2026 respectively.

ScorecardNo meaningful differences
Fast Slow versus Jihora: the parameters behind the verdict, then further details
ParameterFast SlowJihora
PriceFreeFree
Rating5.0 (36 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings36 — better—
Update frequencyEvery 2 weeksWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree—
DevicesiPhoneiPhone, iPad — better
Requires iOS18.0 — better18.6
Further details — not scored
Size23 MB8 MB
Age rating4+4+
DeveloperZan CerneJIHO LEE

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
3 purchases

Jihora

Subscriptions2
  • FastWise Pro (Monthly)$7.991 Month
  • FastWise Pro (Yearly)$39.991 Year
One-time1
  • FastWise Pro (Lifetime)$79.99

Questions

Is Fast Slow free?
Fast Slow is free to download, with in-app purchases available.
Is Jihora free?
Jihora is free to download, with in-app purchases available.
Do Fast Slow or Jihora have ads?
Neither Fast Slow nor Jihora shows ads.
Which is updated more often, Fast Slow or Jihora?
Fast Slow ships an update every 2 weeks, and Jihora weekly. Most recently, Fast Slow was updated on October 17, 2026 and Jihora on October 6, 2026.

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