The human behind the code
Hey, I'm Carlos 👋
Indie developer · RationalBit
UV Buddy exists because I kept coming back from hikes looking like a lobster. I'd forget sunscreen entirely, or apply it once at 9 AM and consider myself invincible for the day. The apps I tried either buried the UV index in a weather screen or felt like homework — nothing actually told me what to do, when.
So I built the thing I wanted: a buddy that knows my skin type, watches the real UV where I'm standing, times my sunscreen like an alarm clock, and — since I was going to be in the sun anyway — paces my tan so I get the glow without the burn.
RationalBit is a one-person studio. That means no growth team, no data broker deals, and no committee deciding to add a feed to a sunscreen app. It also means when you email, the developer answers.
Real science, friendly face
The burn math is standard dermatology (Fitzpatrick types, MED) — the stickers are just how it goes down easier.
Built for families
The app got serious the day people started using it for their kids. One plan covers everyone on purpose.
Private by design
No accounts, no ads, no data sales. Your data lives on your phone and your own iCloud. The policy is short and honest.
Your voice drives it
Most features started as a user email. Found something annoying? Tell me — I read everything.
Say hi
Feedback, ideas, bug reports, or just a sunny hello: [email protected]. More of my work lives at carlosgarciadev.com.