A UV index app should do more than reprint a weather icon. The index is an international 0–11+ scale of erythemally weighted ultraviolet — sunburn-causing UV, not temperature. Basky starts there, then finishes the sentence: what does this sky mean for my skin today?
Plain primer: what is the UV index. Product tour: how Basky works. If you want UV without a login wall, also see UV app without account.
What you see on Today
- A UV number for the current conditions Basky can see.
- A plain-language band — low, moderate, high, and so on — so the scale is human.
- A personal safe-sun window in minutes, sized with your Fitzpatrick type.
- A path into the safe sun timer when you are ready to bask.
That layout is intentional. A lone UV digit invites guesswork. A window invites a short, capped visit outdoors — then a return to shade, clothing, or sunscreen as needed.
Live UV, optional location
Allow location and Basky requests today’s UV from Open-Meteo using coarse coordinates for the lookup. That is the entire location story. No ad network. No “improve our models with your GPS trail.” No account to hang a history on.
Decline location and Basky still opens. You get a generic fallback with an honest note so you know the number is not local. The habit should not hold privacy hostage.
Why the same UV is different for different people
Minimal erythemal dose rises with deeper constitutive melanin. Basky’s reference points (J/m²) look like: type I 200, II 250, III 350, IV 450, V 600, VI 1000. The Exposure Engine aims for about 60% of a MED, then clamps to roughly 5–90 minutes. Same UV 7, different clocks.
That is why Basky is not a one-size “stay out 20 minutes” widget. Skin type is not a fashion label; it is how the timer stays kind to fair skin without treating deeper skin as invincible. Always: wellness guidance, not medical clearance.
UV is not heat, and clouds are not a light switch
Cool, clear noon can be harsher ultraviolet than a muggy evening. Thin or broken cloud can still pass a lot of UV. Bright indoor glass is usually a different story than open sky. Basky reads forecast UV rather than trusting how warm your arms feel. Deeper reading: clouds and UV, shade and UV.
What Basky will never do with the index
- Stretch the window so a streak survives bad judgment.
- Celebrate over-exposure.
- Sell darkening skin as the point of the number.
- Replace sunscreen with a math excuse.
- Hide the UV loop behind a monthly fee.
The vitamin D estimate may climb during a capped bask; it stays capped with the same safe dose and is never treated as a lab result. The daylight streak can use a check-in when UV is resting. Circles cheer sun days without broadcasting your UV history.
Free core, private by default
The UV readout and personal window are free forever. Basky Forever is optional pixel cosmetics — one-time, never a subscription on the sky. No ads fund the Today screen. Session history stays on device. Optional Apple Health writes only Time in Daylight duration; Basky never reads Health and never writes the estimate. More: private sun app.
Who this UV index app is for
People who glance at UV before a walk and want minutes, not vibes. Travelers who know latitude changes the story. Parents and caregivers who want a conservative framing without shame. Anyone comparing apps and allergic to account walls — sun app no subscription.
Now on the iOS App Store. More answers in the FAQ and glossary. Reach Andrew at andrewkittridge@icloud.com. Read the number. Read your window. Step outside for a little, not a lot.
Reading the Today sky like a human
Basky prefers plain words beside the digit. “Moderate” should mean something you can act on. “Very high” should shorten plans without panic. Bands follow familiar international groupings; the personal window is where Basky adds value weather apps usually skip.
Hour-to-hour change matters. Late morning through early afternoon is often the peak at mid-latitudes. Basky may hint at better light timing so you are not stuck with a single stale snapshot. Deeper: UV index by hour and best time of day for sun.
Travel and microclimates
Flying to a sunnier latitude? Trust the live lookup on arrival more than muscle memory from home. Beach sand, snow, and water bounce UV; city shade can cut it. Basky sizes a starting window — you still read the place you are standing. Travel notes: travelers UV.
How Basky talks about risk
The tone stays warm. Higher UV is not a moral failing of the day; it is a shorter invitation. Lower UV is not “useless”; it may be a check-in day. Shame is bad UX for sunlight. So is reckless cheerleading. Basky aims between those poles.
Data honesty
Open-Meteo provides the UV when location is on. Forecasts are models, not ground truth sensors taped to your wrist. Thin cloud, sudden breaks, and local shade introduce variance. Basky stays conservative partly for that reason. If the sky surprises you, believe your skin and your SPF before any app.
Pairing UV with the rest of Basky
UV readout → personal minutes → safe sun timer → optional estimate and streak. Circles do not broadcast your UV number. Forever does not buy a “premium UV feed.” Privacy: private sun app. No-account framing: UV app without account.
Who should look elsewhere
If you want a tanning coach, dose prescriptions, or a social scoreboard of burn minutes, Basky will disappoint you on purpose. If you want a calm UV index app that becomes a capped habit, you are the audience.
Practical checklist before you step out
- Glance at UV and band.
- Glance at your minutes.
- Decide sunscreen and clothing like an adult — Basky will not argue for less protection.
- Start the timer only in real outdoor light.
- Stop at the cap; shade is not failure.
Now on the App Store. More science in what is the UV index. Contact andrewkittridge@icloud.com.