# FastWindow vs Nistis

The clearest difference is iOS requirement: FastWindow at 15.1 against Nistis's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. FastWindow sells 1 one-off in-app purchase and Nistis sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | FastWindow | Nistis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/nistis-fasting-timer/id6799102652/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | — | Every 2 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 37 MB | 18 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [PROJECTSNAPLABS LTD](https://appshunter.io/developer/1889904681) | [Little Theta LLC](https://appshunter.io/developer/1895438187) |

## What reviewers say

### 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 |


### Nistis

[App page](https://appshunter.io/ios/app/nistis-fasting-timer/id6799102652)

This app helps you track fasting periods with customizable timers and editing capabilities. It offers a free version with core features and an optional one-time purchase for advanced functionalities like Apple Watch integration and health syncing.

**Highlights:** Customizable fasting timers (16:8, OMAD, etc.), Editable fasting history, Stage timeline with common fasting phases, Offline functionality, Optional iCloud sync, Apple Watch app, Home screen and lock screen widgets

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $2.99 | per month |
| Pro Annual | $14.99 | per year |
| Pro Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is FastWindow free?

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

### Is Nistis free?

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

### Do FastWindow or Nistis have ads?

Neither FastWindow nor Nistis 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.*