# SunMax vs Vitamin D Window Widget

The clearest difference is in-app purchases: Vitamin D Window Widget at none against SunMax's 3. SunMax's advantage is update cadence (every 5 days vs every 2 weeks) and iOS requirement (15.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. SunMax sells 3 in-app purchases, starting at $4.99 per month. Vitamin D Window Widget asks for nothing beyond the download.

SunMax ships an update every 5 days, Vitamin D Window Widget every 2 weeks. The most recent releases landed on October 25, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | SunMax | Vitamin D Window Widget |
| --- | --- | --- |
| 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 | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 2 weeks |
| Monetization | — | Free |
| Size | 27 MB | 2 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Oliver Stojcevski](https://appshunter.io/developer/1829807990) | [Airhopping, SL](https://appshunter.io/developer/1339572434) |

## What reviewers say

### SunMax

[App page](https://appshunter.io/ios/app/sunmax-vitamin-d-tracker/id6749281214)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $4.99 | per month |
| Premium Yearly | $39.99 | per year |
| SunMax Premium Lifetime | $69.99 | one-time |


### 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


## Frequently asked questions

### Is SunMax free?

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

### Is Vitamin D Window Widget free?

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

### Do SunMax or Vitamin D Window Widget have ads?

Neither SunMax nor Vitamin D Window Widget shows ads.

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

SunMax ships an update every 5 days, and Vitamin D Window Widget every 2 weeks. Most recently, SunMax was updated on October 25, 2026 and Vitamin D Window Widget on October 10, 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.*