Comparison

TKD Tas vs Vitamin D Sun Tracker

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

TKD Tas

Features
Read full description

TKD Tas (Tae Kwon Do Tasmania) works with the ancient Korean martial art to incorporate techniques for self defence, along with improving health and fitness. We provide a range of programs in our gym for adults and children of all skill levels. Our childrens program is designed to help with developing coordination, confidence, self control, concentration, fitness and balance, and provides a lot of fun. Download our free App to keep in touch, up to date with classes and times, make enquiries and more

About

Vitamin D Sun Tracker

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
Read full description

Vitamin D is the easiest deficiency to fix, but the hardest to track. Bask estimates the Vitamin D you get from sun exposure and supplements, so you can stop guessing and start hitting your goal. Bask is a sun tracker and sun timer that reads the sky, live UV Index, weather, your skin, and what you're wearing to tell you the best time to step outside and exactly how long to stay. SUN SESSIONS + SUN SAFETY - Real-time Vitamin D estimates from our live UV Index, UV tracker, weather, and our sun tracker algorithm - Built-in sun timer with time-to-sunburn guidance so you never overdo it - Time-to-sunburn timer can assist you during your tanning sessions. - Live Activities keep your session on the Lock Screen (iOS 16.1+) FIND YOUR BEST SUN WINDOWS - 48-hour UV forecast of your optimal exposure times with our sun tracker - Get alerts right before your best Vitamin D window opens SUPPLEMENTS + COFACTORS - Quick-log common vitamin D doses in a tap with our vitamin tracker - Track magnesium & vitamin K2 with bite-size education cards HISTORY, STREAKS & INSIGHTS - A clean timeline of every sun exposure session and supplementation. - Track Vitamin D labs to see the impact of your sun exposure and supplement habits. - 7 / 30 / 90-day trends to watch your Vitamin D levels climb PRIVATE BY DESIGN - Your data stays on your device - Optional Apple Health integration - Optional opt-in leaderboard Bask is for educational and wellness tracking only and does not provide medical advice. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

TKD Tas3 screens
Vitamin D Sun Tracker4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 8 level
TKD Tas versus Vitamin D Sun Tracker: the parameters behind the verdict, then further details
ParameterTKD TasVitamin D Sun Tracker
PriceFreeFree
Rating—4.8 (28 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—28 — better
Update frequencyEvery 15 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.6 — better16.0
Further details — not scored
Size25 MB42 MB
Age rating12+17+
DeveloperSteven Whittaker WelchGreycloud LLC

In-app purchases

None

TKD Tas

No in-app purchases

4 purchases

Vitamin D Sun Tracker

Subscriptions3
  • Monthly$4.991 Month
  • Yearly3 Days trial$24.991 Year
  • Yearly3 Days trial$29.991 Year
One-time1
  • Lifetime$79.99

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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