Sunkat reads the live UV index where you are and gives you your skin type's exact safe minutes — so you glow instead of peel.
Your weather app has a UV number buried in it — but you have to go looking, it never pings you mid-tan, and it reads the same for every skin type. A flat “20-minute” timer ignores the sun completely. Sunkat turns the live UV and your skin type into your exact safe minutes — then tells you when they're up.
No sign-up, no guesswork. Sunkat does the maths dermatologists use — automatically.
Choose your Fitzpatrick skin type (I–VI) once. It sets how quickly your skin reaches its safe UV limit.
Sunkat pulls the real-time UV index and hourly forecast for your exact location — cloud-adjusted, not a guess.
See your personalised safe minutes, the best window to tan, and a loud flip reminder halfway through.
A personalised duration from your Fitzpatrick type and the current UV — clamped to a sensible range.
Current UV index with color-coded risk, plus an hour-by-hour forecast so you can plan your day.
Sunkat highlights the hours when UV is ideal for tanning — enough to work, not enough to scorch.
A halfway alert so you tan evenly on both sides and never forget to turn over.
Alarm-level alerts break through silent mode and a locked screen so you actually hear time's up.
Log every session and build a streak — a gentle nudge toward consistent, safe sun habits.
Try the same calculation Sunkat runs — pick your skin type and a UV index.
Sunkat combines your Fitzpatrick skin type with the live UV index for your location. It uses each skin type's minimal erythema dose — the UV exposure that starts to cause redness — targets a safe fraction of it, and divides by the current UV intensity to give you a personalised number of minutes. Adding your sunscreen's SPF extends the safe window.
The higher the UV index, the faster your skin reaches its limit, so your safe window shrinks. Sunkat shows the current and hourly UV index and points you to the best window for tanning without excessive exposure — usually when UV is moderate rather than extreme.
Yes. Enter your sunscreen's SPF and Sunkat extends your safe tanning window accordingly, up to a sensible cap so the recommendation stays realistic.
Sunkat runs on iPhone (iOS 15 and later) and Android (7.0 and later), and it's free to download on both the App Store and Google Play.
No. Sunkat gives general guidance based on UV index and skin type. It isn't medical advice — always use appropriate sun protection and consult a dermatologist if you have concerns about your skin.
Free on iOS and Android. Pick your skin type, check the UV, and tan smarter in under a minute.
Sunkat