# Zero Fast vs FastWindow

The clearest difference is iOS requirement: FastWindow at 15.1 against Zero Fast's 26.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Zero Fast sells 2 in-app purchases, starting at $6.99 per month and FastWindow sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Zero Fast | FastWindow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/zero-fast-fasting-tracker/id6748047745/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Monetization | Freemium | — |
| Size | 35 MB | 37 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [APPE LATTE LIMITED](https://appshunter.io/developer/1480686912) | [PROJECTSNAPLABS LTD](https://appshunter.io/developer/1889904681) |

## What reviewers say

### Zero Fast

[App page](https://appshunter.io/ios/app/zero-fast-fasting-tracker/id6748047745)

Track your intermittent fasting journey with an AI-powered coach. Get personalized plans, real-time metabolic insights, and science-backed education to support your weight management and metabolic health goals. Log hydration, weight, and mood to optimize your fasting experience.

**Highlights:** AI Fasting Coach, Personalized weekly fasting plans, Multiple fasting profiles, Real-time metabolic tracking, Hydration logging, Weight and progress dashboard, Apple Health integration

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zero Fast Monthly | $6.99 | per month |
| Zero Fast Annually | $49.99 | per year |


### FastWindow

[App page](https://appshunter.io/ios/app/fastwindow-fasting-timer/id6764386746)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FastWindow Pro | $4.99 | one-time |


## Frequently asked questions

### Is Zero Fast free?

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

### Is FastWindow free?

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

### Do Zero Fast or FastWindow have ads?

Neither Zero Fast nor FastWindow shows ads.

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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.*