# Tan timer+ vs Vitamin D™ · UV Index

The clearest difference is in-app purchases: Tan timer+ at none against Vitamin D™ · UV Index's 6. Tan timer+ also leads on iOS requirement (15.0 vs 17.6). Vitamin D™ · UV Index's advantage is update cadence (every 4 weeks vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Vitamin D™ · UV Index sells 5 in-app purchases, starting at $2.99 per month. Tan timer+ asks for nothing beyond the download.

Tan timer+ ships an update every 4 months, Vitamin D™ · UV Index every 4 weeks. The most recent releases landed on October 3, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Tan timer+ | Vitamin D™ · UV Index |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/vitamin-d-uv-index/id6470038527/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 28.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 4 weeks** |
| Monetization | — | Freemium |
| Size | 15 MB | 24 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Olga Novikova](https://appshunter.io/developer/1565997235) | [Eloi Canals](https://appshunter.io/developer/1538407230) |

## What reviewers say

### Tan timer+

[App page](https://appshunter.io/ios/app/tan-timer-plus/id1636716597)

**Features:** macOS Compatibility

**In-app purchases:** none


### Vitamin D™ · UV Index

[App page](https://appshunter.io/ios/app/vitamin-d-uv-index/id6470038527)

This app provides real-time UV index monitoring and personalized sun exposure recommendations to help you safely harness the sun's energy for optimal Vitamin D synthesis. It offers tailored sun protection advisories and customizable alerts for sun safety.

**Highlights:** Real-time UV index forecasting, Personalized sun exposure recommendations, Sun protection advisories, Vitamin D synthesis timer, Customizable safety alerts, Health monitoring app integration

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Vitamin D™ Pro | $2.99 | per month |
| Vitamin D™ Pro | $2.99 | per month |
| Vitamin D™ Pro | $19.99 | per year |
| Vitamin D™ Pro | $19.99 | per year |
| Vitamin D™ Pro | $49.99 | one-time |


## Frequently asked questions

### Is Tan timer+ free?

Tan timer+ is free to download, with no in-app purchases.

### Is Vitamin D™ · UV Index free?

Vitamin D™ · UV Index is free to download, with in-app purchases available.

### Do Tan timer+ or Vitamin D™ · UV Index have ads?

Neither Tan timer+ nor Vitamin D™ · UV Index shows ads.

### Which is updated more often, Tan timer+ or Vitamin D™ · UV Index?

Tan timer+ ships an update every 4 months, and Vitamin D™ · UV Index every 4 weeks. Most recently, Tan timer+ was updated on October 3, 2026 and Vitamin D™ · UV Index on October 20, 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.*