# TKD Tas vs Vitamin D Sun Tracker

The clearest difference is in-app purchases: TKD Tas at none against Vitamin D Sun Tracker's 4. Vitamin D Sun Tracker's advantage is update cadence (weekly vs every 15 months). On price, ads, device support and iOS requirement 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. TKD Tas asks for nothing beyond the download.

TKD Tas ships an update every 15 months, Vitamin D Sun Tracker weekly. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | TKD Tas | Vitamin D Sun Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (28 ratings)](https://appshunter.io/ios/app/vitamin-d-sun-tracker-bask/id6758405235/reviews)** |
| Number of ratings | — | **28** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Weekly** |
| Monetization | — | Freemium |
| Size | 25 MB | 42 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [Steven Whittaker Welch](https://appshunter.io/developer/1625791354) | [Greycloud LLC](https://appshunter.io/developer/1767904895) |

## What reviewers say

### TKD Tas

[App page](https://appshunter.io/ios/app/tkd-tas/id1041387662)

**Features:** macOS Compatibility

**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 TKD Tas free?

TKD Tas 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 TKD Tas or Vitamin D Sun Tracker have ads?

Neither TKD Tas nor Vitamin D Sun Tracker shows ads.

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

TKD Tas ships an update every 15 months, and Vitamin D Sun Tracker weekly. Most recently, TKD Tas was updated on October 26, 2026 and Vitamin D Sun Tracker on October 28, 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.*