Raio home screen: Sant Cugat del Vallès, 25 °C and cloudy, UV index 6.7 rated High with the day's UV curve peaking at 14:00, and a plan of 43 minutes, flip every 10 minutes, SPF 50. Raio skin tone scanner: detected Fitzpatrick Type III, shade 3, ITA 35.3 degrees, with a session review that reads 'You tanned beautifully'. Raio tan session in progress: 01:33 elapsed of a recommended 14 minutes, 206 IU of vitamin D so far, currently tanning the front with the next flip in 08:27. Raio calendar: a 14-day window with tanned days marked, 231 IU of vitamin D earned on Tuesday 9 June, an average safety score of 70 and the UV forecast curve. Raio profile: Fitzpatrick Type III with its shade swatches, stats of 2 sessions, a 1-day streak, 4 badges and an average score of 70, and the tan progression chart.

An iPhone app that times your tan to your skin and today’s sun.

Free on the App Store, with an optional membership.

raio

A day with Raio

  1. First, look at the sun before it looks at you.

    Raio opens on your city: the weather, the UV index right now, the curve of the whole day with its peak, and the plan it has made for your skin.

  2. Then let the camera read your skin.

    Flash on, hand about 15 cm from the lens. Raio measures the brightness of your skin, works out its ITA angle and places you on the Fitzpatrick scale, with a shade from one to twelve.

  3. Lie down. The timer knows your limit.

    Your session runs against a budget set by your type and the UV. Raio tells you when to turn from front to back, nudges you about SPF and counts the vitamin D as you go.

  4. Look back over the last fourteen days.

    Every session lands in the calendar with its length, its UV, its SPF and a safety score out of 100, so a good week and a careless one are easy to tell apart.

  5. Watch the shade change, slowly.

    Your profile keeps the tan progression shade by shade from the first scan, with your streak and the badges you earn in Game Center.

Your skin, your minutes.

My skin is

Type III, medium: sometimes burns, tans gradually.

6.7

In Sant Cugat del Vallès the curve climbs past 6 by late morning in summer and peaks around two.

Raio would plan High
11 minSession
5 minFlip
SPF 50+SPF

Type III allows about 25 minutes a day at gentle UV. Today that shrinks to 11.

This is the rule the app uses to plan a session, run in your browser. It is a guide built on the Fitzpatrick scale, not medical advice; if your skin reddens, get out of the sun.

Fair questions

Is this medical advice? No. Raio is a guide built on the Fitzpatrick skin scale and the UV index. It cannot see a mole or a rash; for anything that worries you, see a dermatologist.

How does it decide how long I can stay out? Each skin type has a daily allowance, from 10 minutes for Type I to 80 for Type VI at gentle UV. Raio shrinks it as the UV rises and never plans a single session longer than 45 minutes.

Why does it tell me to turn over? So both sides get the same dose. It splits the session into quarters, and never asks you to flip more often than every five minutes.

How does the skin scan work? With the flash on, you hold your hand about 15 cm from the camera. Raio measures the brightness and warmth of the skin, turns them into an ITA angle and maps that to a type and shade. If the light is too dark or too bright, it says so.

I don’t want to scan. Do I have to? No. Answer one question about how your skin reacts to the sun and Raio starts from that. A scan, when you take one, replaces the answer.

Which sunscreen should I wear? Raio picks a factor from today’s UV and your type, from SPF 15 for darker skin on a soft day up to 50+ whenever the UV reaches 8, and reminds you to reapply.

Does it count vitamin D? It gives a running estimate in IU during each session, against a daily goal of 1,000 IU. Treat it as a rough guide, not a lab result.

Where do my photos go? Your skin photos sync through your own iCloud. We collect only anonymized usage data, never linked to you, and you can switch it off in Settings. The privacy policy has the detail.

Does it work where I live? Search for any city and the weather, UV and plan follow it, at home or on holiday.

What does it cost? Raio is free to download. An optional membership is sold through the App Store, and Apple handles the payment.

Who makes Raio? Nicolas Skonieczny and Fedor Artamonov, in Spain. Write to us at our contact page.

Tan smarter.
Never burn.

Download Raio, answer one question or take one scan, and your first plan is waiting on the home screen.

How does your skin react to sun?

The first thing Raio asks you.

Raio starts you at Type III: about 25 minutes a day at gentle UV, with SPF 30.

Download on the App Store