# Vitamin D Window Widget vs SolGlow

The clearest difference is review sentiment: Vitamin D Window Widget at 100% against SolGlow's 50%. Vitamin D Window Widget also leads on rating (5.0 vs 3.7) and in-app purchases (none vs 2). SolGlow's advantage is device support (3 vs 1). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. SolGlow sells 2 in-app purchases, starting at $9.99 per year. Vitamin D Window Widget asks for nothing beyond the download.

Vitamin D Window Widget holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews point the same way: 100% of Vitamin D Window Widget's written reviews are positive against 50% of SolGlow's.

Vitamin D Window Widget ships an update every 2 weeks, SolGlow every 10 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | Vitamin D Window Widget | SolGlow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/vitamin-d-window-widget/id6759223422/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/solglow-vitamin-d-tracker/id6763976252/reviews) |
| Number of ratings | 2 | **3** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 10 days** |
| Monetization | **Free** | Freemium |
| Size | 2 MB | 10 MB |
| Requires iOS | 18.0 | **17.2** |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 12+ |
| Developer | [Airhopping, SL](https://appshunter.io/developer/1339572434) | [Michael Smith](https://appshunter.io/developer/1893971383) |

## 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


### SolGlow

[App page](https://appshunter.io/ios/app/solglow-vitamin-d-tracker/id6763976252)

This app automatically estimates your daily vitamin D intake based on sunlight exposure, skin type, and location. It provides real-time UV index, burn-safe time remaining, and integrates with Apple Watch for effortless tracking. Features include winter mode, supplement check-ins, and advanced planning tools for Pro users.

**Highlights:** Automatic vitamin D estimation, Live UV index and IU-per-minute rate, Burn-safe time remaining with alerts, Winter Mode for low-sun periods, Supplement check-in, 7-day UV forecast (Pro), Trip Planner for jet lag (Pro)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SolGlow Pro Annual | $9.99 | per year |
| SolGlow Pro | $29.99 | one-time |


## Frequently asked questions

### Is Vitamin D Window Widget free?

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

### Is SolGlow free?

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

### Which has better reviews, Vitamin D Window Widget or SolGlow?

Vitamin D Window Widget is rated higher. Vitamin D Window Widget averages 5.0 out of 5 from 2 ratings, while SolGlow averages 3.7 from 3 ratings.

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

Neither Vitamin D Window Widget nor SolGlow shows ads.

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

Vitamin D Window Widget ships an update every 2 weeks, and SolGlow every 10 days. Most recently, Vitamin D Window Widget was updated on October 31, 2026 and SolGlow on October 31, 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.*