Comparison

Wrist Temperature Tracker vs Sun Exposure

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

Head to head
About

Wrist Temperature Tracker

Visualize your Apple Watch's overnight wrist temperature readings as historical data and convenient widgets. Understand your temperature trends over time, with options for monthly, yearly, and comparative views. Requires a compatible Apple Watch and proper sleep tracking setup.

Highlights
  • Nightly reading history (7, 30, 90 days, 1 year)
  • Monthly calendar with relative color coding
  • Cycle comparison with period start data
  • Widgets and complications for quick access
  • Customizable reading notifications
  • Health data diagnostics
Features
Read full description

How has your wrist temperature changed over the past nights? Wrist Temperature Tracker shows your Apple Watch readings as history, comparisons and widgets. For people with a compatible Watch who want a clearer view of their overnight data in Apple Health. The app does not take measurements and is not an on-demand thermometer. Try the iPhone app for six days after installation. Continued access then requires a monthly subscription, annual subscription, or one-time purchase. You can restore an existing purchase. Before you start - You need an Apple Watch that supports wrist temperature sensing. - Wear it while sleeping. Track Sleep with Apple Watch and Sleep Focus need to be active for at least 4 hours per night. - After setup or pairing, establishing a baseline usually takes about 5 nights. - Allow the app to read wrist temperature from Health. If Health has no samples, the app cannot show any values. Features - Measured night readings over 7, 30 or 90 days, or one year. Missing nights stay visible. - A monthly calendar with colours relative to that month's median, not a medical temperature threshold. - Compare cycles using recorded period starts from Apple Health or your own local entries. The app does not write cycle data to Health. - Widgets and complications for quick access to recent data - Get notified when a new reading arrives: all readings, or only values below or above your absolute temperature thresholds. No on-demand measurement or guaranteed daily notification. - A diagnostics area for Health data, notifications, and purchases Temperature patterns do not confirm ovulation. Not for contraception or diagnosis. Terms and conditions: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Sun Exposure

This app helps you safely enjoy sunlight by tracking your exposure, estimating Vitamin D production, and monitoring burn time. It offers personalized guidance for various goals, from protection to building a healthy tan, and can integrate with Apple Watch for automatic tracking.

Highlights
  • Daily sun tracking
  • Vitamin D estimation
  • Burn time monitoring
  • Personalized sun guidance
  • Automatic Apple Watch tracking
  • Exposure notifications
  • UV index forecasts
Features
Read full description

Sun Exposure is your smart companion for outdoor living. Track your sun exposure, estimate Vitamin D production, monitor burn time, time your morning light, and get personalized guidance — all designed to help you enjoy sunlight safely, whether your goal is staying protected, boosting Vitamin D, building a healthy tan, or starting your day with morning light. See how much sunlight you've had today with a quick glance. Start a Sun Session right from your iPhone to record your time in daylight — no Apple Watch required. Or pair with your Apple Watch for automatic, all-day sun tracking with real-time insights and recommendations so you can get the benefits of sunlight without the burn. FREE FEATURES - Daily Sun Tracking - See how much time you've spent in the sun today at a glance. - Sun Sessions - Record your sun exposure directly from your iPhone. Your Time in Daylight is saved to Apple Health automatically. - Smart Sun Guidance - Get personalized recommendations on when to get more rays, apply sunscreen, or move to the shade. - Widgets and Complications - Access your sun stats from your home screen or Apple Watch face. - Exposure Notifications - Get alerts when you've reached your daily sun limit. PRO FEATURES - First Light (New) - See what time you first get daylight each day, and how it compares to your wake time and local sunrise. Getting outdoor light soon after waking is widely recommended to help set your circadian rhythm for better energy, mood, and sleep. - Automatic Vitamin D Logging - Your estimated Vitamin D intake is calculated and saved to Apple Health throughout the day, automatically. No need to start a session. - Burn Time Alert - Get notified when your safe sun time reaches zero based on your exposure and the current UV Index. - Vitamin D Estimate - See how much Vitamin D your body is producing based on your sun data, the UV Index, and your skin type. - Burn Time - Know exactly how much safe time you have left in the sun right now, based on today's exposure, UV forecast, and your skin type. - Sun Session Vitamin D Tracking - With location enabled, Sun Sessions calculate and save your Vitamin D production to Apple Health. - Custom Exposure Goals - Tailor your sun time for Vitamin D, safe tanning, or balanced wellness. - Forecasts - UV Index and weather forecasts help you plan the best times for outdoor activity. - Reminder Alerts - Stay balanced with gentle nudges throughout the day. - Sunrise and Sunset Tracking - Plan your outdoor sessions around daylight hours. WHY SUN EXPOSURE? - Sunlight is essential for Vitamin D, mood, sleep, and overall well-being, but overexposure puts your skin at risk. Sun Exposure helps you find the right balance — enough sun for health and glow, without crossing into damage. - Track sun exposure with or without an Apple Watch. Automatic all-day sun tracking with Apple Watch requires watchOS 10 or later. Sun Sessions work on iPhone for on-demand tracking anytime. - Privacy first - no personal data leaves your device unless you choose to share it. Disclaimer: Consult your doctor to determine the right amount of sun exposure for you. Always use sunscreen, hats, and shade as needed. Privacy Policy: https://sunexposure.app/privacy-policy/ Terms of Use: https://sunexposure.app/terms-of-use/

Screenshots

Wrist Temperature Tracker4 screens
Sun Exposure4 screens

Verdict

The call

The clearest difference is rating: Sun Exposure at 4.5 against Wrist Temperature Tracker's 3.4. Sun Exposure also leads on review sentiment (46% vs 28%). Wrist Temperature Tracker's advantage is ratings volume (128 vs 41). On price, update cadence, ads and in-app purchases 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. Wrist Temperature Tracker sells 3 in-app purchases, starting at $1.99 per month and Sun Exposure sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Sun Exposure holds the better App Store score, 4.5 against 3.4. Both are backed by a comparable volume of ratings — 128 and 41 respectively. Written reviews point the same way: 28% of Wrist Temperature Tracker's written reviews are positive against 46% of Sun Exposure's.

UpkeepUpdate frequency

Wrist Temperature Tracker ships an update every 11 days, Sun Exposure every 3 weeks. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

Scorecard3 real differences · 7 level
Wrist Temperature Tracker versus Sun Exposure: the parameters behind the verdict, then further details
ParameterWrist Temperature TrackerSun Exposure
PriceFreeFree
Rating3.4 (128 ratings)4.5 (41 ratings) — better
Positive reviews28.0% of reviews46.2% of reviews — better
Number of ratings128 — better41
Update frequencyEvery 11 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, Apple WatchiPhone, iPad, Apple Watch — better
Requires iOS18.018.0
Further details — not scored
Size5 MB192 MB
Age rating4+4+
DeveloperBernhard HeringAdam Oxner

Customer experience

Wrist Temperature Tracker

All ratings127 ratings
Positive58.3%
Neutral3.9%
Negative37.8%
Written reviews107 reviews
Positive28.0%
Neutral9.3%
Negative62.6%

Sun Exposure

All ratings41 ratings
Positive85.4%
Neutral2.4%
Negative12.2%
Written reviews13 reviews
Positive46.2%
Neutral7.7%
Negative46.2%

In-app purchases

3 purchases

Wrist Temperature Tracker

Subscriptions2
  • Monthly Subscription$1.991 Month
  • Yearly Subscription$11.991 Year
One-time1
  • Unlock Wrist Temperature$79.99
3 purchases

Sun Exposure

Subscriptions2
  • Sun Exposure Pro$1.991 Month
  • Sun Exposure Pro$11.991 Year
One-time1
  • Customize Settings$4.99

Questions

Is Wrist Temperature Tracker free?
Wrist Temperature Tracker is free to download, with in-app purchases available.
Is Sun Exposure free?
Sun Exposure is free to download, with in-app purchases available.
Which has better reviews, Wrist Temperature Tracker or Sun Exposure?
Sun Exposure is rated higher. Wrist Temperature Tracker averages 3.4 out of 5 from 128 ratings, while Sun Exposure averages 4.5 from 41 ratings.
Do Wrist Temperature Tracker or Sun Exposure have ads?
Neither Wrist Temperature Tracker nor Sun Exposure shows ads.
Which is updated more often, Wrist Temperature Tracker or Sun Exposure?
Wrist Temperature Tracker ships an update every 11 days, and Sun Exposure every 3 weeks. Most recently, Wrist Temperature Tracker was updated on November 7, 2026 and Sun Exposure on November 3, 2026.

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