This hub is a criteria checklist for comparing sun, UV, daylight, and vitamin D apps. It deliberately avoids naming other products, “vs” matchups, and App Store podium claims. You bring any candidate; you score it against the same rows. Basky is now on iOS and is built to pass these rows — useful as a reference implementation, not as a crowned ranking.
How to use this hub
- Pick the jobs you care about (UV readout, timer, habit, estimate, privacy).
- Score each job with the checklists below.
- Open the deep guide for any row you want to unpack.
- Prefer calm specificity over star-count theater.
Basky’s overall loop: how Basky works.
1. Live UV and honesty about place
Look for: today’s UV from a forecast or observation; plain-language band; clear behavior if location is denied.
Prefer: optional when-in-use location; no silent wrong-city; no stored coordinate journal.
Basky: Open-Meteo UV when location allowed; generic fallback with a Home note when not; coordinates not kept as history.
Deep dive: best UV index app for iPhone · UV index explained · uv index app
2. Personal skin type in the minutes
Look for: Fitzpatrick (or equivalent) in onboarding; minutes that change with skin and UV.
Prefer: conservative clamps; no one-size “everyone 20 minutes.”
Basky: Exposure Engine maps skin type + UV → personal safe minutes.
Deep dive: best sun timer app · safe-sun timer
3. Hard safety cap
Look for: timer stops at the personal window; over-exposure earns nothing; streaks never stretch the dose.
Prefer: “enough” as the win state.
Basky: calm fill to a cap; no reward past the line.
Deep dive: best sun timer app
4. Cloudy-day daylight habit
Look for: check-in when UV is too low; streaks that forgive weather; year-round usefulness.
Prefer: separate bask mode from daylight mode — both honest.
Basky: “got some daylight” check-in; cloudy miss won’t break the streak.
Deep dive: best daylight habit app
5. Vitamin D framing
Look for: estimate language; same safety cap; no treatment claims; no Health write of IU figures.
Prefer: encouragement, not a fake lab.
Basky: friendly in-app estimate only; never written to Health.
Deep dive: best vitamin D sun app · vitamin D estimate
6. Sun exposure history
Look for: on-device session log; capped sessions; kind gray-week UI; no GPS route diary.
Prefer: share cards without location.
Basky: local history; optional circle shares first name + sun day only.
Deep dive: sun exposure tracker iOS
7. Account and identity
Look for: full core without signup; local prefs; social only if opt-in and minimal.
Prefer: no email wall before first UV screen.
Basky: no account, no login; circles optional with anonymous install ID.
Deep dive: UV app without an account · private sun app
8. Broader privacy
Look for: no ads; no third-party analytics SDKs; local notifications; narrow network egress; readable policy.
Prefer: Health opt-in write-only (Time in Daylight).
Basky: no ads, no analytics SDK; local reminder; Health write-only daylight; never reads Health.
Deep dive: private wellness app iPhone · Apple Health daylight
9. Money model
Look for: free forever core that includes UV, timer, cap, habit, history, estimate.
Prefer: optional one-time cosmetics; avoid renting the safety loop.
Basky: free core forever; Basky Forever one-time Sunshine Pack skins.
Deep dive: sun app no subscription · Basky Forever
Master scorecard
| Criterion | Question to ask | Basky stance |
|---|---|---|
| Live UV | Is today’s sky reflected? | Yes, via weather UV + fallback |
| Skin type | Are minutes personal? | Yes, Fitzpatrick-based |
| Safety cap | Does the app stop you? | Yes, hard personal cap |
| Cloudy habit | Does gray weather still work? | Yes, check-in + kind streak |
| Vitamin D honesty | Estimate, not lab? | Yes; not written to Health |
| History | Local, capped, kind? | Yes, on device |
| Account | Required? | No |
| Trackers/ads | Present? | No |
| Health | Write-only daylight? | Yes, opt-in |
| Pricing | Core free? | Yes; one-time cosmetics optional |
Print this table mentally when you skim any App Store page. You do not need competitor brand names to decide.
Suggested path through the guides
- Start with UV: best UV index app for iPhone
- Add the timer: best sun timer app
- Check habit durability: best daylight habit app
- Verify estimate ethics: best vitamin D sun app
- Verify logging: sun exposure tracker iOS
- Verify identity: UV app without an account
- Verify privacy: private wellness app iPhone
- Verify pricing: sun app no subscription
A 10-minute compare session
If you only have a short window to evaluate an app (or Basky’s upcoming listing), run this script:
- Complete or skim onboarding — note whether an account is required.
- Find today’s UV and whether skin type changed the minutes.
- Start a timer mentally — is there a clear stop?
- Find the cloudy / low-UV path.
- Open privacy language — ads, analytics, Health scope.
- Open the purchase sheet — subscription vs one-time vs none; what is gated?
Write yes/no beside the master scorecard. The app with more honest yeses is the better fit for a gentle sun ritual — regardless of download volume marketing.
What this hub refuses
- Naming other apps or “tan” framing wars.
- Fake ranking or star-rating claims for Basky.
- Medical promises about vitamin D or disease.
- Stretching “compare” into a sales landing page of superlatives.
Compare calmly. Prefer the app that pairs sky + skin + stop, keeps data local, and leaves the core free. Basky is built that way — now on iPhone. General wellness guidance, not medical advice. Clothing, shade, sunscreen, and clinicians still matter on every bright day the checklist cannot see.