SimFast: Fasting Tracker

Contains adsIn-app purchases
4.7
5.22K reviews
100K+
Downloads
Content rating
Mature 17+
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About this app

Want to succeed with intermittent fasting?

Instead of just starving yourself, let us help you build healthy habits with scientific and systematic management. Start your smart health journey with 'SimFast', praised by countless users.

Why choose 'SimFast'?

[NEW] SimFast AI

AI Schedule Recommendations: Stop guessing! Our AI automatically recommends the perfect intermittent fasting schedule tailored to your lifestyle.

AI Calorie Calculation: Just snap a photo of your food, and the AI calculates the calories to smartly log and manage your diet.

The Easiest Intermittent Fasting Timer

Supports all fasting methods like 16:8 and 5:2, with smart alarms for your start and end times. (โ€ป Please check your notification settings!)

Unlimited Custom Fasting

Choosing your fasting times and schedules is completely free. Manage your fasting plan without ads.

All-in-One Health Tracking

Track your fasting hours, weight changes, meals, workouts, and water intake all in one place.

Fasting Analysis & Reports

Provides detailed stats on fasting hours and meal calories, with weekly and monthly reports.

Convenient Home Widget

Instantly check and control your fasting status right from your home screen with our widget.

Detailed Fasting Stages

Get useful tips and info on what's happening in your body hour-by-hour during a fast. Understanding these changes is key to success.

Secure Backup & Restore

Protect your valuable data with our easy-to-use backup and restore feature.

Visual Progress & Meal Logging

Log your meals and visual progress ("eye body") with photos to see your amazing transformation. It's the best motivation to keep going!

The Science-Backed Benefits of Intermittent Fasting

โ–ธ Effective Weight Loss: Burn body fat and prevent excess fat storage.
โ–ธ Boosted Metabolism & Autophagy: Enhance your metabolism and improve cellular health.
โ–ธ Improved Blood Sugar Control: Increase insulin sensitivity to naturally manage blood sugar levels.
โ–ธ Promotes Detox & Cell Regeneration: Support your bodyโ€™s natural detox and cellular repair processes.
โ–ธ Reduces Inflammation: Lower inflammation levels and reduce the risk of chronic diseases.
โ–ธ Enhanced Mental Clarity & Energy: Experience improved brain function and mood.

The perfect intermittent fasting app for you if:

You're new to intermittent fasting and don't know where to start.

You want to stay motivated with a systematic fasting app.

You aim for both weight loss and a healthy lifestyle.

You've struggled with managing diets and counting calories.

The secret to a successful diet is 'consistency'.
'SimFast', the best intermittent fasting app, will help you build healthy habits.

Download 'SimFast' now and start your healthy transformation!
Updated on
Oct 15, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
App info and performance and Device or other IDs
This app may collect these data types
Personal info and Photos and videos
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.7
5.14K reviews
Christina Allen
December 22, 2024
It seems like it would be a great app, however it starts the fast immediately. I want to be able to schedule my fasts. It also has a pop up to remind to allow tracking unless all the items are selected, which is super annoying. So uninstalled.
1 person found this review helpful
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Eurika Zebadia
July 29, 2020
Very simple and easy to use. Some of the fiture are written in korean so i dont understand ๐Ÿ˜ญ๐Ÿ˜ญ but most of it are written in english.
6 people found this review helpful
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Liviet
July 29, 2020
Hello Eurika Zebadia. First of all, Thank you for using Gandan! That you mentioned will be translated to english!! Gandan always do our best to be best IF application! Have a great day!!
Veronica Kim
June 8, 2024
Just have purchaesd for the premium. Everything is perfect except for there is no way to change its weight unit from kg to lbs. Please add this feature option for the US users.
4 people found this review helpful
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Liviet
June 21, 2024
์•ˆ๋…•ํ•˜์„ธ์š”! ์‚ฌ์šฉ์ž ๋ฆฌ๋ทฐ๋ฅผ ๋‚จ๊ฒจ ์ฃผ์…”์„œ ๊ฐ์‚ฌํ•ฉ๋‹ˆ๋‹ค. ํ”„๋ฆฌ๋ฏธ์—„ ๊ตฌ๋งค๋ฅผ ๊ถŒ์žฅํ•ด ์ฃผ์‹  ์ ์— ๊ฐ์‚ฌ๋“œ๋ฆฝ๋‹ˆ๋‹ค. ๋ฌด๊ฒŒ ๋‹จ์œ„๋ฅผ kg์—์„œ lbs๋กœ ๋ณ€๊ฒฝํ•  ์ˆ˜ ์—†๋‹ค๋Š” ์ ์ด ๋ถˆํŽธํ•˜์…จ๋‹ค๋Š” ์‚ฌ์‹ค์„ ์ €ํฌ์—๊ฒŒ ์•Œ๋ ค ์ฃผ์…”์„œ ์ฃ„์†กํ•ฉ๋‹ˆ๋‹ค. ์ €ํฌ ํŒ€์€ ๋ฏธ๊ตญ ์‚ฌ์šฉ์ž๋ฅผ ์œ„ํ•ด ์ด ๊ธฐ๋Šฅ ์˜ต์…˜์„ ์ถ”๊ฐ€ํ•  ์ˆ˜ ์žˆ๋„๋ก ๋…ธ๋ ฅํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค. ๋” ๋‚˜์€ ์„œ๋น„์Šค๋ฅผ ์ œ๊ณตํ•˜๊ธฐ ์œ„ํ•ด ๋…ธ๋ ฅํ•  ๊ฒƒ์ด๋ฉฐ, ์‚ฌ์šฉ์ž ์—ฌ๋Ÿฌ๋ถ„์˜ ์˜๊ฒฌ์„ ์†Œ์ค‘ํžˆ ์—ฌ๊ธฐ๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. ๊ถ๊ธˆํ•œ ์ ์ด๋‚˜ ์ถ”๊ฐ€์ ์ธ ํ”ผ๋“œ๋ฐฑ์ด ์žˆ์œผ์‹œ๋ฉด ์–ธ์ œ๋“ ์ง€ ๋ง์”€ํ•ด ์ฃผ์„ธ์š”. ๋„์›€์ด ํ•„์š”ํ•˜์‹œ๋ฉด ์–ธ์ œ๋“  ์ €ํฌ์—๊ฒŒ ์—ฐ๋ฝ ์ฃผ์„ธ์š”. ๊ฐ์‚ฌํ•ฉ๋‹ˆ๋‹ค!

Whatโ€™s new

- Fixed issue where widget and top fixed notification time stopped.
- Optimized widget-related battery efficiency.
- Added ability to change widget background and text colors.

We will continue to do our best to provide a great SimFast app.

App support

About the developer
๊น€์œคํ›„
liviet.korea@gmail.com
๊ฐ€์ •๋กœ 406, 104๋™ 3101ํ˜ธ (๊ฐ€์ •๋™, ๋ฃจ์›์ง€์›ฐ์‹œํ‹ฐํ‘ธ๋ฅด์ง€์˜ค) ์„œ๊ตฌ, ์ธ์ฒœ๊ด‘์—ญ์‹œ 22765 South Korea
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