# Fasting Window vs Sleep Flight

The clearest difference is update cadence: Sleep Flight at every 4 days against Fasting Window's every 2 months. Fasting Window's advantage is iOS requirement (13.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Fasting Window ships an update every 2 months, Sleep Flight every 4 days. The most recent releases landed on October 24, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Fasting Window | Sleep Flight |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Size | 21 MB | 45 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [HeungYeol Kim](https://appshunter.io/developer/1878087341) | [Chengdu Zhixiang Technology Company Limited](https://appshunter.io/developer/6797436665) |

## What reviewers say

### Fasting Window

[App page](https://appshunter.io/ios/app/fasting-window-if-timer/id6774622599)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Sleep Flight

[App page](https://appshunter.io/ios/app/sleep-flight-fun-wake-alarm/id6797436663)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Fasting Window free?

Fasting Window is free to download, with no in-app purchases.

### Is Sleep Flight free?

Sleep Flight is free to download, with no in-app purchases.

### Do Fasting Window or Sleep Flight have ads?

Neither Fasting Window nor Sleep Flight shows ads.

### Which is updated more often, Fasting Window or Sleep Flight?

Fasting Window ships an update every 2 months, and Sleep Flight every 4 days. Most recently, Fasting Window was updated on October 24, 2026 and Sleep Flight on October 19, 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.*