![Just launched Burnie: A free, private UV index & sunscreen countdown timer for iOS with zero ads or tracking [Free]](https://external-preview.redd.it/d5IXE2lp5SfQZyGR8irTpL7N8fuGcd0o1OqjN59ZcA0.jpeg?width=140&height=73&auto=webp&s=36628fd7b3aa4e646501b871c454c615d9f8100d)
Just launched Burnie: A free, private UV index & sunscreen countdown timer for iOS with zero ads or tracking [Free]
Hey r/iOSApps community,
Quick summary of the app based on the sub rules:
* A – Answer: Solves sunscreen guesswork by calculating a dynamic UV-based protection countdown using the Monk skin scale.
* B – Better: Privacy-first (no tracking/no ads), uses a clean Bento-grid UI instead of medical fear tactics, and features an advanced non-linear degradation formula.
* C – Cost: Completely Free (no ads, no IAPs). Link: https://apps.apple.com/us/app/burnie-smart-uv-protection/id6770673915
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I just flipped the switch on Burnie. I built this side project because I constantly find myself getting sunburned, and after seeing skin cancer impact my own family, I wanted to stop guessing with sun safety. I wanted to build something straightforward that provides actual scientific guidance based on live UV data.
The app checks your local UV index, maps it against your skin profile using the scientific Monk Scale, and runs a real-time protection countdown the moment you log your sunscreen application.
Behind the scenes on how the math works:
The countdown isn't just a simple, linear timer. It uses a fine-tuned calculation that assumes your sunscreen degrades dynamically over time based on actual UV exposure levels. I also built in a conservative safety margin to automatically account for natural wear and tear from clothes, sweating, or moving around.
A few intentional choices I made while building it:
* Privacy First: It is built natively on iOS 17 with SwiftData. Absolutely everything stays entirely local on your device. There is no user registration, no data collection, and no ad networks. It doesn't track your location; it merely uses your current coordinates locally to fetch the exact UV data.
* Clean UI: I deliberately avoided scary medical charts or fear-based warnings. Instead, it uses a clean Bento-grid layout with an ambient background that shows your current shield status at a quick glance.
* Smart Nudges: It sends lightweight local notifications exactly when your calculated protection layer degrades under your current local UV conditions.
The app is completely free to download. I am just trying to get the name out there right now and grab some real-world feedback from fellow builders.
I would love to hear your thoughts on the design or the countdown system!