Comparison

Sun Day Tracker 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

Sun Day Tracker

Monitor your daily vitamin D absorption from sunlight exposure. This straightforward application helps you keep track of your sun-related vitamin D intake.

Highlights
  • Track daily vitamin D intake
  • Sunlight exposure monitoring
  • Simple interface
  • Daily tracking
Features
Read full description

A simple app to track you daily vitamin D intake from the sun.

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

Sun Day Tracker1 screens
Vitamin D Sun Tracker4 screens

Verdict

The call

The clearest difference is in-app purchases: Sun Day Tracker at none against Vitamin D Sun Tracker's 4. Vitamin D Sun Tracker's advantage is update cadence (weekly vs monthly) and review sentiment (100% vs 83%). On price, rating, ratings volume and ads 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. Sun Day Tracker asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Vitamin D Sun Tracker holds the better App Store score, 4.7 against 4.6. Both are backed by a comparable volume of ratings — 28 and 26 respectively. Written reviews point the same way: 83% of Sun Day Tracker's written reviews are positive against 100% of Vitamin D Sun Tracker's.

UpkeepUpdate frequency

Sun Day Tracker ships an update monthly, Vitamin D Sun Tracker weekly. The most recent releases landed on October 21, 2026 and October 25, 2026 respectively.

Scorecard4 real differences · 6 level
Sun Day Tracker versus Vitamin D Sun Tracker: the parameters behind the verdict, then further details
ParameterSun Day TrackerVitamin D Sun Tracker
PriceFreeFree
Rating4.6 (28 ratings)4.7 (26 ratings) — better
Positive reviews83.3% of reviews100.0% of reviews — better
Number of ratings28 — better26
Update frequencyMonthlyWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhoneiPhone, iPad — better
Requires iOS17.016.0 — better
Further details — not scored
Size1 MB42 MB
Age rating4+17+
Developerpermissionless tech, llcGreycloud LLC

Customer experience

Sun Day Tracker

All ratings26 ratings
Positive88.5%
Neutral7.7%
Negative3.8%
Written reviews24 reviews
Positive83.3%
Neutral12.5%
Negative4.2%

Vitamin D Sun Tracker

All ratings9 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Sun Day Tracker

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 Sun Day Tracker free?
Sun Day Tracker 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.
Which has better reviews, Sun Day Tracker or Vitamin D Sun Tracker?
Vitamin D Sun Tracker is rated higher. Sun Day Tracker averages 4.6 out of 5 from 28 ratings, while Vitamin D Sun Tracker averages 4.7 from 26 ratings.
Do Sun Day Tracker or Vitamin D Sun Tracker have ads?
Neither Sun Day Tracker nor Vitamin D Sun Tracker shows ads.
Which is updated more often, Sun Day Tracker or Vitamin D Sun Tracker?
Sun Day Tracker ships an update monthly, and Vitamin D Sun Tracker weekly. Most recently, Sun Day Tracker was updated on October 21, 2026 and Vitamin D Sun Tracker on October 25, 2026.

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