# fast_burn — Intermittent Fasting Timer

> Intermittent Fasting Timer (iPhone/iPad app by Keiichiro Hayashida.)

- Source: https://appshunter.io/ios/app/fast-burn/id6768056154 (this page in markdown: same URL + `.md`)
- Developer: [Keiichiro Hayashida](https://appshunter.io/developer/1622333497)
- Category: Health & Fitness
- Price: Free with in-app purchases
- Age rating: 12+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-05-16
- Data updated: 2026-06-24
- User reviews in markdown: https://appshunter.io/ios/app/fast-burn/id6768056154/reviews.md

## What is fast_burn?

Fasting made simple. FastBurn shows what's happening in your body as you fast - from fat burning to autophagy - so every hour feels like
progress.                                                                                                                                                                                                                                                                
                                                                                                                                        
FASTING TIMER                                                                                                                          
One tap to start. A ring UI tracks your elapsed time and body phase: blood sugar rising, fat burning, ketosis, autophagy.

PLANS THAT FIT YOU
Your goal, body type, and experience determine the best protocol:
- 16:8 (16h fast / 8h eat)
- 18:6 (18h fast / 6h eat)
- 20:4 (20h fast / 4h eat)
- 36-hour extended fast

WEIGHT TRACKING + APPLE HEALTH
Log weight and view trends. Syncs automatically with Apple Health.

STATS & CALENDAR
Total fasts, average duration, best streak - all at a glance. Calendar view shows your daily history.

SMART REMINDERS
Customize alerts for fast start, phase changes, and eating windows.


FREE FEATURES
- 16:8 fasting timer
- Fasting history & basic stats
- Weight log

PRO FEATURES
- All fasting plans (18:6, 20:4, 36h)
- Detailed body phase tracking
- Full statistics & trend charts
- Fasting calendar
- Unlimited fasting history


SUBSCRIPTION DETAILS
FastBurn Pro is an auto-renewable subscription.
- Annual plan: includes a 7-day free trial
- Monthly plan
- Payment is charged to your Apple ID at confirmation
- Subscription auto-renews unless canceled at least 24 hours before the current period ends
- Unused portion of a free trial is forfeited upon purchase
- Manage or cancel: Settings > Apple ID > Subscriptions

Terms of Use: https://fastburn-legal.vercel.app/terms.html

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| FastBurn Pro (Annual) | $29.99 | per year |
| FastBurn Pro (Monthly) | $4.99 | per month |



## Version history (last 3 releases)

### 1.2 — 2026-06-01

"Auto-repeat fasting" is now off by default.
You can turn it back on anytime from Settings.

### 1.1 — 2026-05-18

Bug fixes and stability improvements.

### 1.0 — 2026-05-16

No release notes.

## More apps by Keiichiro Hayashida

- [かおぱす](https://appshunter.io/ios/app/id1622333315)
- [sleep_tone](https://appshunter.io/ios/app/sleep-tone/id6761550314)

All apps by Keiichiro Hayashida: https://appshunter.io/developer/1622333497

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-24.*