# Sun Day Tracker — user reviews > 24 indexed App Store user reviews of Sun Day Tracker by permissionless tech, llc, rated 4.60/5 from 26 ratings. - Source: https://appshunter.io/ios/app/sun-day-tracker/id6748545544/reviews - App overview in markdown: https://appshunter.io/ios/app/sun-day-tracker/id6748545544.md - Rating breakdown: 5★ 21 · 4★ 2 · 3★ 2 · 2★ 0 · 1★ 1 ## Newest reviews (7 of 24) ### 5/5 — Super cool and useful *2025-08-03* I love the app. Pretty useful to get sun exposure info and estimate our vitamin D. I use it in France. The only feature I miss is an Apple Watch extension to be able to launch a sun session even when I don’t have my iPhone next to me. ### 5/5 — Cool!! *2025-08-02* Is possible help in translation in some way? ### 5/5 — Track Your Vitamin D Intake *2025-07-30, version 1.0* Great app. Simple and easy way to track your daily vitamin D intake. ### 5/5 — Really smooth *2025-07-23* We need more devs like you. Works great, no bugs. No info getting leaked. ### 5/5 — Sun Salvation *2025-07-21, version 1.0* Living on Earth may be expensive, but it includes an annual free trip around the Sun, and daily D.. vitamin D. ### 5/5 — I’ve fallen in love with the sun *2025-07-16, version 1.0* Sounds overkill but for someone who’s deeply attached to her summer routine and sunrises, I look forward to spending time in the sun and the reminders of peak sun light and the moment when sun is about to depart make me feel emotional. I miss the sun until the next day and look forward to it! My sunrise has turned into my sun ride as I cruise through my favourite part of the day. What have you done Jack lol ### 5/5 — ₿𝗔𝗦𝗘𝗧𝗢𝗦𝗛𝗜 *2025-07-15, version 1.0* 𝗩𝗜𝗧𝗔𝗠𝗜𝗡 𝗗 𝗜𝗦 𝗔𝗡𝗧𝗜𝗗𝗢𝗧𝗘 🍼 ## Most critical reviews (10 lowest-rated) ### 1/5 — Buggy *2026-06-24, version 1.1.2* Constantly pauses itself when it should be running in the background ### 3/5 — Inaccurate AM Sun *2026-08-15, version 1.1.2* When I am outside in August for 2 hours beginning at sunrise, this early-morning window produces little to no meaningful vitamin D in the US zone 8 (34°N). Yet, this tracker has me at 2000 IU. Vitamin D synthesis requires UVB (roughly 290–315 nm). These short wavelengths are strongly absorbed and scattered when the sun is low because the path through the atmosphere (and ozone) is much longer. Practical thresholds for useful vitamin D production are generally solar elevations above ~35–45° (when your shadow is shorter than your height is a common rough guide, corresponding to ~45°). Below that, UVB is minimal or effectively absent for cutaneous vitamin D production even under clear skies. ### 3/5 — UI not friendy for iPhone mini series *2025-08-06* i hardy to choose skin type in this UI ### 3/5 — Good start *2025-07-17, version 1.0* Looks like a nice good start. But if I’m wearing sunscreen, do I select short clothes or long clothes? This is not clear…sunscreen should be taken into account in the coverage calculation… ### 4/5 — Amazing app *2025-09-19* This app is very good, especially considering that it's free. It has a beautiful adaptive design and is easy to use and configure. That's worth four stars! There is one drawback: despite its excellent handling, I personally would like to see an overview of the recordings and mirroring to the Apple Watch for easier and faster start-up. All in all, however, it is THE app for me to track my time in the sun. ### 4/5 — Great Start! *2025-07-21, version 1.0* This is great - like one other reviewer I’d definitely like to see something about sunscreen factored in. But also a live activity in iOS would be great cause man do I forgot I’m tracking and then next thing I know I’m getting a billion and 3 IUs according to the app when in reality I just forgot to stop tracking. Thanks Jack - love seeing little passion projects like this. ### 4/5 — Super neat Jack! *2025-07-18* Just wish I could add in a session when I forget to click the begin button And I wish it would post those sessions to the health tracker so I can see a cumulative numbers relating to my sun, exposure, and vitamin D productions. ### 5/5 — 改进 *2026-07-30* 增加中文就好了哈哈哈 ### 5/5 — Love it! *2026-07-14, version 1.1.2* Need Apple Watch version tho ### 5/5 — Total Lifesaver *2026-07-02, version 1.1.2* Avoid overusing toxic sunscreen with this app. Works very consistently. Most valuable free app on my phone. ## Most praised reviews (7 highest-rated) ### 5/5 — Very useful app *2026-06-15* It is a very useful app that shows the uv index way more exactly than other apps - especially compared to the native weather app on iPhone. I would love an App for Apple Watch as well, because that would make tracking the uv exposure a lot more comfortable. ### 5/5 — Chinese！ *2026-05-23* If possible we need Chinese thank you! ### 5/5 — REQUEST: Add field to data *2026-04-15, version 1.1.2* When Sun Day entries get pulled into the Foodnoms app from Apple Health it uses the ‘Source: Sun Day’ field from the structured data as the title. I think if you added ‘Food Type: Sunlight’ or something like that it would improve how this displays in other apps. ### 5/5 — Best app for vitamin d *2026-03-11, version 1.1.2* Tracks 1. how long you can be outside 2. Clothes you are wearing 3. Whether you’re wearing sunscreen or not 4. Skin tone 5. IU’s you getting 6. Etc And then warns you if it’s not light enough out and you should take vitamin d This is clearly the best app, I’ve seen other apps, this one is better and it’s free just get it. ### 5/5 — Love it! *2025-08-25* This latest version irons out all the niggles of the original: it now keeps a session if you accidentally close the app, and the UV index seems to tally to local weather app now. I love it, thanks Jack! ### 5/5 — Good and simple *2025-08-23* If apple watch can install this app , that’s could be better ### 5/5 — A suggestion *2025-08-07* There is data on sunshine hours in Apple Watch, which can be obtained directly by Health, and then clothing can be predicted by weather temperature, so that the daily data can be automatically recorded rather than recorded by hands --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-06.*