# VitaminD vs FastingWindow

The clearest difference is update cadence: FastingWindow at every 2 days against VitaminD's monthly. VitaminD's advantage is iOS requirement (15.0 vs 26.4). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. VitaminD sells 2 in-app purchases, starting at $1.99 per 7 days and FastingWindow sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

VitaminD ships an update monthly, FastingWindow every 2 days. The most recent releases landed on October 7, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | VitaminD | FastingWindow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fastingwindow/id6769170324/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | — | Free with in-app purchases |
| Size | 44 MB | 5 MB |
| Requires iOS | **15.0** | 26.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [BULENT TEKBAS](https://appshunter.io/developer/6780016696) | [Moon Labs LLC](https://appshunter.io/developer/1896635888) |

## What reviewers say

### VitaminD

[App page](https://appshunter.io/ios/app/vitamind-vitamin-tracker/id6758161303)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Vitamind Weekly Subscription | $1.99 | per 7 days |
| Vitamind Yearly Subscription | $9.99 | per year |


### FastingWindow

[App page](https://appshunter.io/ios/app/fastingwindow/id6769170324)

This app offers a straightforward method for tracking intermittent fasting. It visualizes your fasting progress with a live ring and details the five metabolic stages your body goes through. Understand your body's response during fasting with clear explanations.

**Highlights:** Simple fasting tracking, Live progress ring, Five metabolic stage explanations, No account required, No subscription needed, Real-time progress monitoring

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Forever | $2.99 | one-time |


## Frequently asked questions

### Is VitaminD free?

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

### Is FastingWindow free?

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

### Do VitaminD or FastingWindow have ads?

Neither VitaminD nor FastingWindow shows ads.

### Which is updated more often, VitaminD or FastingWindow?

VitaminD ships an update monthly, and FastingWindow every 2 days. Most recently, VitaminD was updated on October 7, 2026 and FastingWindow on October 6, 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.*