# ExpoDose vs Vitamin D Sun Tracker

The clearest difference is in-app purchases: ExpoDose at none against Vitamin D Sun Tracker's 4. ExpoDose also leads on iOS requirement (13.4 vs 16.0). Vitamin D Sun Tracker's advantage is update cadence (weekly vs every 5 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Vitamin D Sun Tracker sells 4 in-app purchases, starting at $4.99 per month. ExpoDose asks for nothing beyond the download.

ExpoDose ships an update every 5 weeks, Vitamin D Sun Tracker weekly. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | ExpoDose | Vitamin D Sun Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (29 ratings)](https://appshunter.io/ios/app/vitamin-d-sun-tracker-bask/id6758405235/reviews)** |
| Number of ratings | — | **29** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Weekly** |
| Monetization | — | Freemium |
| Size | 27 MB | 42 MB |
| Requires iOS | **13.4** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [siHealth Ltd.](https://appshunter.io/developer/1123107334) | [Greycloud LLC](https://appshunter.io/developer/1767904895) |

## What reviewers say

### ExpoDose

[App page](https://appshunter.io/ios/app/expodose/id6449250736)

**In-app purchases:** none


### Vitamin D Sun Tracker

[App page](https://appshunter.io/ios/app/vitamin-d-sun-tracker-bask/id6758405235)

This app estimates your Vitamin D intake from sun exposure and supplements. It provides real-time UV index, weather, and personalized guidance on optimal sun times and duration to prevent sunburn. Track your progress with historical data and insights.

**Highlights:** Real-time Vitamin D estimates, Live UV Index and weather integration, Personalized sun timer with sunburn guidance, 48-hour UV forecast for optimal exposure, Supplement and cofactor tracking, Historical data and trend analysis, Optional Apple Health integration

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Yearly | $24.99 | per year |
| Yearly | $29.99 | per year |
| Lifetime | $79.99 | one-time |


## Frequently asked questions

### Is ExpoDose free?

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

### Is Vitamin D Sun Tracker free?

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

### Do ExpoDose or Vitamin D Sun Tracker have ads?

Neither ExpoDose nor Vitamin D Sun Tracker shows ads.

### Which is updated more often, ExpoDose or Vitamin D Sun Tracker?

ExpoDose ships an update every 5 weeks, and Vitamin D Sun Tracker weekly. Most recently, ExpoDose was updated on October 25, 2026 and Vitamin D Sun Tracker 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.*