# Vitamin D Sun Tracker & UV vs BiohackMe

The clearest difference is in-app purchases: BiohackMe at none against Vitamin D Sun Tracker & UV's 2. BiohackMe also leads on iOS requirement (16.4 vs 18.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Vitamin D Sun Tracker & UV sells 2 in-app purchases, starting at $2.99 per 7 days. BiohackMe asks for nothing beyond the download.

Vitamin D Sun Tracker & UV ships an update weekly, BiohackMe every 2 weeks. The most recent releases landed on October 24, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Vitamin D Sun Tracker & UV | BiohackMe |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (16 ratings)](https://appshunter.io/ios/app/vitamin-d-sun-tracker-and-uv/id6759393447/reviews)** | — |
| Number of ratings | **16** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 26 MB | 55 MB |
| Requires iOS | 18.6 | **16.4** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Uladzsislau Luchkouski](https://appshunter.io/developer/1821242450) | [Camilla Thompson](https://appshunter.io/developer/6782300815) |

## What reviewers say

### Vitamin D Sun Tracker & UV

[App page](https://appshunter.io/ios/app/vitamin-d-sun-tracker-and-uv/id6759393447)

This app personalizes your sun exposure to optimize vitamin D production and prevent sunburn. It uses your location, skin type, and real-time atmospheric data to determine the best times to be in the sun and when to cover up. Integrates with Apple Health and Apple Watch for seamless tracking.

**Highlights:** Personalized vitamin D windows, Real-time UV index with atmospheric data, Skin type adjustments, Apple Watch complications and alerts, Apple Health integration, Location-based solar altitude, Ad-free and private experience

**Features:** Family Sharing, Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $2.99 | per 7 days |
| Premium Yearly | $49.99 | per year |


### BiohackMe

[App page](https://appshunter.io/ios/app/biohackme/id6782300813)

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

**In-app purchases:** none


## Frequently asked questions

### Is Vitamin D Sun Tracker & UV free?

Vitamin D Sun Tracker & UV is free to download, with in-app purchases available.

### Is BiohackMe free?

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

### Do Vitamin D Sun Tracker & UV or BiohackMe have ads?

Neither Vitamin D Sun Tracker & UV nor BiohackMe shows ads.

### Which is updated more often, Vitamin D Sun Tracker & UV or BiohackMe?

Vitamin D Sun Tracker & UV ships an update weekly, and BiohackMe every 2 weeks. Most recently, Vitamin D Sun Tracker & UV was updated on October 24, 2026 and BiohackMe 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.*