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App Store Apps > Health & Fitness > Onefast: Fasting Timer
Onefast: Fasting Timer icon

Onefast: Fasting Timer

by Nguyen Dinh Chung · Health & Fitness · Free
On the App Store since September 2026 · Data updated 2026-10-20

Onefast: Fasting Timer is made and published by Nguyen Dinh Chung. AppBrain is an independent app data site and isn't affiliated with Nguyen Dinh Chung. The app name, icon, screenshots and description belong to Nguyen Dinh Chung and are shown as published on the App Store.

AppBrain's verdict

Last updated
September 17, 2026
Size
4.39 MB
Official page on the App Store

User feedback

Ratings and reviews on the App Store

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Store listing

By Nguyen Dinh Chung, from the App Store
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Screenshots by Nguyen Dinh Chung, from the the App Store listing
Description by Nguyen Dinh Chung Written by the developer, not by AppBrain. Click to read.
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/
Official page on the App Store

Safety and technology

Found in the app by AppBrain
Price
Free
App size
4.39 MB
Content rating
Everyone

Technologies used by Onefast: Fasting Timer

Releases

Updates seen on the App Store
Version
1.0.1
Launched
September 2026

No changelog data

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About the app and developer

About Onefast: Fasting Timer

Onefast: Fasting Timer is a health & fitness app developed by Nguyen Dinh Chung.

User Ratings

The app has no ratings yet.

App Information

Onefast: Fasting Timer is freely available from the App Store. The app size is 4.39 MB. The latest version available is 1.0.1. The last update was on September 17, 2026.

Technical Requirements

The app has a content rating of Everyone. The app has been available on the App Store since September 2026.

Developer information for Nguyen Dinh Chung

Nguyen Dinh Chung

Address:

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