Comparison

TrueFast vs Onefast

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

Head to head
About

TrueFast

Track your intermittent fasting journey with a clean, ad-free interface. Monitor your progress, set personalized goals, and access educational content. Offers seamless integration with Apple Watch and Lock Screen widgets for easy access.

Highlights
  • Fasting timer with elapsed and remaining time
  • Saved goals for common fasting plans
  • Schedules and reminders
  • History calendar, streaks, and badges
  • Lock Screen widgets and Apple Watch support
  • Fasting phase education
  • Local-first data storage
Features
Read full description

Your time. Your pace. TrueFast is a focused intermittent fasting timer for iPhone, iPad, and Apple Watch. Start a fast, follow your goal, and keep a clear record of your routine. No ads and no separate account required. Core fasting stays free • Start, stop, and edit fasts, with elapsed and remaining time. • Save goals for common fasting plans or choose your own duration. • Keep one active recurring schedule with reminders. • Review your fasting history, streaks, and badges. • Check progress with Home Screen and Lock Screen widgets, Live Activities, and Apple Watch. • Use light or dark appearance and explore fasting phase education. • Keep your records on your device and use the core timer offline. More flexibility with TrueFast Pro Flexible week planning Move or skip one day's fast without changing your recurring routine. Save adjustments for individual dates, let reminders follow the adjusted time, and check for overlapping fasts before saving. Private routine reviews Compare saved planned and recorded start times, and summarize your Easy, Fine, and Hard reflections. Reviews show dates, sample counts, and missing data. Calculations happen on your device, helping you understand your recorded routine without treating missing days as failures. Pro also includes: • Unlimited recurring schedules. • Optional iCloud sync across devices. • Weight tracking with Apple Health. • Advanced charts and CSV export. • Custom accent colors. The new planning and review features are included for existing Pro subscribers and lifetime owners. Core fasting remains free. Pro is available by subscription or as a one-time lifetime purchase; see current options and regional prices in the app. Your routine, your records TrueFast works locally by default. If you enable Pro sync, your records use your private iCloud database. Apple Health integration is optional. In Settings, you can send feedback through an email draft you review before sending; basic app and device diagnostics are optional and off by default. TrueFast is intended for adults. Fasting may not be appropriate for children, teens, pregnant or breastfeeding people, people with a history of eating disorders, or people with certain medical conditions. Consult a qualified healthcare professional before fasting. TrueFast does not provide medical advice, diagnosis, or treatment. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula Privacy Policy: https://gettruefast.com/privacy-policy Support: https://gettruefast.com/support

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

TrueFast4 screens
Onefast4 screens

Verdict

The call

The clearest difference is update cadence: Onefast at every 2 days against TrueFast's every 6 days. TrueFast's advantage is device support (3 vs 1). On price, ads, in-app purchases and iOS requirement 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. TrueFast sells 6 in-app purchases, starting at $2.99 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

TrueFast ships an update every 6 days, Onefast every 2 days. Both last shipped on October 31, 2026.

Scorecard2 real differences · 7 level
TrueFast versus Onefast: the parameters behind the verdict, then further details
ParameterTrueFastOnefast
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 6 daysEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPad, Apple Watch — betteriPhone
Requires iOS18.017.0 — better
Further details — not scored
Size6 MB4 MB
Age rating17+4+
DeveloperEvan MattsonNguyen Dinh Chung

In-app purchases

6 purchases

TrueFast

Subscriptions2
  • TrueFast Pro Monthly$2.991 Month
  • TrueFast Pro Yearly$19.991 Year
One-time4
  • Buy Us a Coffee$1.99
  • Power the Fast$4.99
  • Super Supporter$9.99
Show 1 more
  • TrueFast Pro (Lifetime)$29.99
2 purchases

Onefast

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

Questions

Is TrueFast free?
TrueFast is free to download, with in-app purchases available.
Is Onefast free?
Onefast is free to download, with in-app purchases available.
Do TrueFast or Onefast have ads?
Neither TrueFast nor Onefast shows ads.
Which is updated more often, TrueFast or Onefast?
TrueFast ships an update every 6 days, and Onefast every 2 days. Most recently, TrueFast was updated on October 31, 2026 and Onefast on October 31, 2026.

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