# Window vs Fast12

The clearest difference is monetization model: Window at free against Fast12's freemium. Window also leads on iOS requirement (17.6 vs 26.0). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. Window sells 1 one-off in-app purchase and Fast12 sells 2 in-app purchases, starting at $12.99 per month. Whichever you choose, the download price is not the number that matters.

Window ships an update every 9 days, Fast12 every 10 days. Both last shipped on October 13, 2026.

## The numbers

| Metric | Window | Fast12 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/window-fasting-timer/id6757469789/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 10 days |
| Monetization | **Free** | Freemium |
| Size | 7 MB | 29 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 12+ | 17+ |
| Developer | [发发 道](https://appshunter.io/developer/1812431550) | [D App Online Ltd](https://appshunter.io/developer/1442403007) |

## What reviewers say

### Window

[App page](https://appshunter.io/ios/app/window-fasting-timer/id6757469789)

This intermittent fasting timer helps you build healthy eating habits with real-time progress tracking and motivational animations. View your fasting status on the Lock Screen and Dynamic Island without opening the app. Track your history, streaks, and success rate with local data storage and no ads.

**Highlights:** One-tap fasting start, Real-time progress tracking, Dynamic Island & Live Activities integration, Preset and custom fasting durations, Fasting history and statistics, Local data storage

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Window Pro | $0.99 | one-time |


### Fast12

[App page](https://appshunter.io/ios/app/fast12-intermittent-fasting/id6770261704)

Build a sustainable fasting routine with a simple timer and personalized coaching. Track your fasting window, hydration, and sleep to understand your body's rhythms. Features AI meal scanning and meal guidance to support your eating window.

**Highlights:** Simple fasting timer, Beginner-friendly 12-hour fast, Smart fasting insights, Personal coaching, Hydration tracking, AI Meal Photo Scanner, Apple Watch support

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fast12 Premium Monthly | $12.99 | per month |
| Fast12 Premium Annual | $49.99 | per year |


## Frequently asked questions

### Is Window free?

Window is free to download, with in-app purchases available.

### Is Fast12 free?

Fast12 is free to download, with in-app purchases available.

### Do Window or Fast12 have ads?

Neither Window nor Fast12 shows ads.

### Which is updated more often, Window or Fast12?

Window ships an update every 9 days, and Fast12 every 10 days. Most recently, Window was updated on October 13, 2026 and Fast12 on October 13, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*