Comparison

Fastory vs Onefast

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

Head to head
About

Fastory

This app offers personalized intermittent fasting guidance with an AI coach that analyzes your health data. It provides tailored insights, progress tracking, and flexible fasting timers to help you build healthy habits. Integrates with Apple Health and offers convenient widgets for at-a-glance updates.

Highlights
  • Personal AI Coach
  • AI insights after each fast
  • Flexible fasting timer
  • Weight & BMI tracking
  • Daily journal
  • Apple Health integration
  • Home Screen widgets
Features
Read full description

Fastory is intermittent fasting with a personal AI coach — not generic articles, but advice written from YOUR data. Start a 7-day free trial. WHY FASTORY • Personal AI Coach — chat anytime. It reads your fasting history, weight trend, hydration and journal, then answers in your language. • AI insight after every fast — a tailored takeaway the moment you finish, powered by GPT, not a canned tip. • Weekly & Monthly AI Reviews — your progress recapped with concrete next steps. TRACK EVERYTHING • Flexible fasting timer with stages — 14:10, 16:8, 18:6, 20:4, OMAD, 36h or custom. • Goal-reached celebration, eating-window reminders and smart stage notifications. • Weight & BMI tracking with goal progress and clean charts. • Daily journal — mood, body symptoms, meals, photos and notes. • Stats — total fasting hours, streaks, mood trends and pattern insights. • Guided programs (7-day, 28-day, OMAD) to build the habit. • 53 achievements and tier badges to keep you going. WORKS WITH APPLE HEALTH Two-way sync for weight, hydration, steps, sleep and activity, so your fasting data lives alongside the rest of your health. AT A GLANCE — NO NEED TO OPEN THE APP • Home Screen widget — your fasting progress, right on your iPhone home screen. • Lock Screen Live Activity & Dynamic Island — watch the timer tick in real time without unlocking. • Start and end a fast straight from the widget. ON YOUR WRIST • Full Apple Watch app — start, watch and end a fast from your wrist. • Watch-face complication — your fast on your watch face, always visible. PREMIUM Fastory Premium unlocks the Personal AI Coach, AI reviews, pattern insights, unlimited history, advanced charts, custom protocols, guided programs, 16 app icons and data export. Try it free for 7 days, then $6.99/month or $39.99/year. Cancel anytime. Subscriptions auto-renew unless turned off at least 24h before the period ends. Manage or cancel in your App Store account settings. Privacy Policy: https://you-447015.web.app/privacy Terms: https://you-447015.web.app/terms

About

Onefast

Read full description

A fasting timer that does one thing well. Pick a plan, tap Start, and Onefast counts. The time left is on your lock screen and in the Dynamic Island, so you never open the app just to look. When the goal is reached it tells you once, then keeps counting, up to seven days. ONE TAP No sign-up, no questions, no tour. The first screen is the plan picker with 16:8 already selected; the second is the timer. That is the whole setup. ALWAYS RIGHT The timer is a clock, not a counter. Force-quit the app, restart the phone, change time zone — it comes back showing the true elapsed time, to the second. The widget, the Live Activity and the app all read the same moment. YOURS TO EDIT Forgot to tap End? Fix the time afterwards. Add a fast you did last week. Overlaps are named in words, not blocked silently. Fasts longer than 24 hours are allowed — Onefast asks once whether you meant it, then never again. QUIET WHEN YOU WANT Three switches: Live Activity with Dynamic Island, the lock screen widget, and the home screen widget. Notifications turn on and off one kind at a time, and the mid-fast ones start off. PLANS 12:12, 14:10, 16:8, 18:6, 20:4 and one meal a day are built in. Up to five named custom plans and a weekly schedule with Pro. NO ADS. EVER. Not on the free tier, not after you buy. Onefast has no server, no account and no analytics. Your history lives on your iPhone and, if you turn it on, in your own private iCloud. ONEFAST PRO Unlimited history (free keeps the last 30 days), 30-day and all-time stats with charts, month and year summaries, insights from your own record, milestones you can share, a weekly schedule with rest days, up to five named custom plans, two-way weight sync with Apple Health, a weight goal line on your chart, ten ring colours and app icons or a colour of your own, a medium calendar widget, and CSV export. Two prices, one name: a yearly subscription that auto-renews until cancelled, or a single lifetime purchase. No trial. The price is on screen before you tap anything. Everything that makes the timer usable — lock screen, notifications, backup, editing — stays free with or without Pro. Onefast is a timer. It gives no medical or dietary advice; talk to a professional before changing how you eat. Available in English, 日本語, 한국어, 繁體中文, Italiano, Nederlands, Deutsch, Français, Español, Português (Brasil), العربية, Türkçe and Tiếng Việt. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://primetruthteam.github.io/onefast/privacy/

Screenshots

Fastory4 screens
Onefast4 screens

Verdict

The call

The clearest difference is update cadence: Onefast at every 2 days against Fastory's every 9 days. Fastory's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price, 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. Fastory sells 2 in-app purchases, starting at $6.99 per month and Onefast sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Fastory ships an update every 9 days, Onefast every 2 days. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

Scorecard3 real differences · 6 level
Fastory versus Onefast: the parameters behind the verdict, then further details
ParameterFastoryOnefast
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 9 daysEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPod, Apple Watch — betteriPhone
Requires iOS15.1 — better17.0
Further details — not scored
Size99 MB4 MB
Age rating17+4+
DeveloperPhonthip SatthabunNguyen Dinh Chung

In-app purchases

2 purchases

Fastory

Subscriptions2
  • Fastory Premium Monthly$6.991 Month
  • Fastory Premium Annual7 Days trial$39.991 Year
2 purchases

Onefast

Subscriptions1
  • Onefast Pro (Yearly)$9.991 Year
One-time1
  • Onefast Pro (Lifetime)$19.99

Questions

Is Fastory free?
Fastory is free to download, with in-app purchases available.
Is Onefast free?
Onefast is free to download, with in-app purchases available.
Do Fastory or Onefast have ads?
Neither Fastory nor Onefast shows ads.
Which is updated more often, Fastory or Onefast?
Fastory ships an update every 9 days, and Onefast every 2 days. Most recently, Fastory was updated on October 24, 2026 and Onefast on October 29, 2026.

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