# Vitamin D Sun Tracker vs SUNniDAY

The clearest difference is in-app purchases: SUNniDAY at none against Vitamin D Sun Tracker's 4. On price, update cadence, 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. SUNniDAY asks for nothing beyond the download.

Vitamin D Sun Tracker ships an update weekly, SUNniDAY every 9 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | Vitamin D Sun Tracker | SUNniDAY |
| --- | --- | --- |
| 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 | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 9 days |
| Monetization | Freemium | — |
| Size | 42 MB | 3 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Greycloud LLC](https://appshunter.io/developer/1767904895) | [Jesse Wales](https://appshunter.io/developer/6787576011) |

## What reviewers say

### 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 |


### SUNniDAY

[App page](https://appshunter.io/ios/app/sunniday/id6787576009)

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

**In-app purchases:** none


## Frequently asked questions

### Is Vitamin D Sun Tracker free?

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

### Is SUNniDAY free?

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

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

Neither Vitamin D Sun Tracker nor SUNniDAY shows ads.

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

Vitamin D Sun Tracker ships an update weekly, and SUNniDAY every 9 days. Most recently, Vitamin D Sun Tracker was updated on October 31, 2026 and SUNniDAY on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*