Comparison

FastFox vs Yorisou

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

Head to head
About

FastFox

Features
Read full description

FastFox makes intermittent fasting simple with real-time phase tracking, body metrics, and personalized insights. No subscriptions โ€” just a one-time Pro upgrade. FASTING TIMER & PHASES: - Beautiful countdown ring with real-time progress - See your current fasting phase โ€” from fat burning to ketosis and autophagy - Supports 16:8, 18:6, 20:4, OMAD, and custom schedules - Smart timer saves progress in background and auto-completes fasts FASTING GUIDE LIBRARY: - 10 expert articles on coffee, exercise, sleep, electrolytes, and more - Science-backed answers to common fasting questions HISTORY & TRACKING: - Calendar view with complete log of all past fasts - Weekly summary with streak counter - Water intake and energy level tracking per fast - Fast summary review after every session HOME SCREEN WIDGET: - Track your fasting timer and phase right from your home screen - Small and medium widget sizes with real-time countdown - Auto-updates with phase transitions โ€” no need to open the app PRO (one-time $14.99): - Personalized Insights โ€” Smart coaching based on your fasting patterns, best schedule, weak days, and optimal start times - Body Metrics Dashboard โ€” Track weight, BMI, waist, and body fat trends with visual charts - Phase Deep Dive โ€” Detailed science behind each fasting stage - Fasting Guide Library โ€” Full access to all 10 expert guides - Custom Schedule โ€” Set your own fasting hours beyond standard presets - CSV & PDF Export โ€” Export your data and reports anytime - Ad-Free Experience โ€” Clean, distraction-free interface PRIVACY FIRST: All data stays on your device. No accounts, no cloud uploads. Your health data belongs to you. WHY FASTFOX? Most fasting apps lock basic features behind $40โ€“80/year subscriptions. FastFox gives you a complete fasting tracker โ€” phases, insights, body metrics, and guides โ€” for a single one-time purchase. No recurring charges, ever. Made by MyQuietSpot Inc.

About

Yorisou

Features
Read full description

Yorisou helps couples share cycle and mood context gently on one iPhone. WHAT YOU CAN DO - Record mood, symptoms, and cycle phase in a few taps - See period, follicular, ovulation, luteal, and PMS phases on a calendar - Show a partner only today's support hints, while symptoms, mood, notes, and history stay private - Switch between self and partner roles on one iPhone - Explore 24 gentle support hints across six cycle states PRO FEATURES - View cycle, mood, and symptom history without a time limit - Browse the full calendar history - See all four support hints for the current cycle state - Your data stays on your device; no account or external transmission is required PRICING - Weekly ยฅ250/week, with a 3-day free trial for eligible users - Yearly ยฅ4,800/year - Auto-renewing subscriptions; cancel at least 24 hours before period end - Manage or cancel in Settings > Apple ID > Subscriptions Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://starcrown.co.jp/privacy Support: https://starcrown.co.jp/support

Screenshots

FastFox4 screens
Yorisou4 screens

Verdict

The call

The clearest difference is ads: Yorisou at none against FastFox's shown. Yorisou also leads on update cadence (every 6 days vs every 2 months). FastFox's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price and in-app purchases there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. FastFox sells 1 one-off in-app purchase and Yorisou sells 2 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

FastFox ships an update every 2 months, Yorisou every 6 days. The most recent releases landed on September 24, 2026 and September 19, 2026 respectively.

Scorecard4 real differences ยท 2 level
FastFox versus Yorisou: the parameters behind the verdict, then further details
ParameterFastFoxYorisou
PriceFreeFree
Update frequencyEvery 2 monthsEvery 6 days โ€” better
AdsYesNo โ€” better
In-app purchasesYesYes
DevicesiPhone, iPad, iPod โ€” betteriPhone
Requires iOS15.0 โ€” better17.0
Further details โ€” not scored
Size51 MB10 MB
Age rating12+4+
DeveloperMyQuietSpot Inc.Starcrown Inc

In-app purchases

1 purchases

FastFox

One-time1
  • FastFox Pro$14.99
2 purchases

Yorisou

Subscriptions2
  • Weekly Pro3 Days trial$1.997 Days
  • Yearly Pro$29.991 Year

Questions

Is FastFox free?
FastFox is free to download, with in-app purchases available.
Is Yorisou free?
Yorisou is free to download, with in-app purchases available.
Do FastFox or Yorisou have ads?
FastFox shows ads; Yorisou does not.
Which is updated more often, FastFox or Yorisou?
FastFox ships an update every 2 months, and Yorisou every 6 days. Most recently, FastFox was updated on September 24, 2026 and Yorisou on September 19, 2026.

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