# Vitamin D Window Widget vs Studio T23

The clearest difference is iOS requirement: Studio T23 at 16.0 against Vitamin D Window Widget's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Vitamin D Window Widget ships an update every 2 weeks, Studio T23 every 9 days. The most recent releases landed on October 10, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Vitamin D Window Widget | Studio T23 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/vitamin-d-window-widget/id6759223422/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | Free | — |
| Size | 2 MB | 100 MB |
| Requires iOS | 18.0 | **16.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Airhopping, SL](https://appshunter.io/developer/1339572434) | [FITsociety BV (Apps)](https://appshunter.io/developer/1756257213) |

## What reviewers say

### Vitamin D Window Widget

[App page](https://appshunter.io/ios/app/vitamin-d-window-widget/id6759223422)

This app displays the optimal times of day for natural vitamin D production based on your location and the sun's elevation. It offers real-time sun schedules, smart widgets for home screen access, and notifications to help you maximize your sun exposure.

**Highlights:** Real-time sun schedule, Smart widgets, Daily schedule updates, Dynamic Island countdown, Location-based calculations, Offline functionality, Solar-themed design

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

**In-app purchases:** none


### Studio T23

[App page](https://appshunter.io/ios/app/studio-t23/id6782046095)

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

**In-app purchases:** none


## Frequently asked questions

### Is Vitamin D Window Widget free?

Vitamin D Window Widget is free to download, with no in-app purchases.

### Is Studio T23 free?

Studio T23 is free to download, with no in-app purchases.

### Do Vitamin D Window Widget or Studio T23 have ads?

Neither Vitamin D Window Widget nor Studio T23 shows ads.

### Which is updated more often, Vitamin D Window Widget or Studio T23?

Vitamin D Window Widget ships an update every 2 weeks, and Studio T23 every 9 days. Most recently, Vitamin D Window Widget was updated on October 10, 2026 and Studio T23 on October 17, 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.*