Jack Dorsey vibe coded another app, and this one tracks your Vitamin D
Jack Dorsey
just released his second app in a week, and this time it's all about soaking up the sun safely. The new iOS app called Sun Day helps users track their UV exposure and estimate vitamin D levels based on location, skin type, and how much clothing they're wearing.
The app works by using your phone's location to pull up the local UV index, then lets you manually toggle when you're stepping in and out of sunlight. Tell it your skin type from six options, mention whether you're rocking shorts and a t-shirt or bundled up, and Sun Day calculates how much vitamin D you're getting and how long you can stay outside before risking a burn.
This follows last weekend's release of Bitchat, Dorsey's encrypted peer-to-peer messaging app that works over Bluetooth without needing internet. Both apps are part of what he calls his "learning" process through weekend coding projects, and he's building them using an open-source
AI coding tool
called
Goose
, which is developed by Dorsey's
Block
.
The app keeps things simple. You tap a button when you go outside, tap it again when you head back in, and it gives you a rough estimate of your vitamin D gains for that session and the whole day. It also shows useful info like sunrise and sunset times, cloud cover, and your personal burn limit based on the UV index.
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by Taboola
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Sun Day is currently available through Apple's TestFlight beta program, with the full source code posted on GitHub for anyone who wants to dig in. There's no word yet on when it might hit the regular App Store or if an Android version is planned. But seeing how quick
Dorsey
shipped out Bitchat for Android, he might possibly be already working on it.
For someone who sold Twitter and stepped back from the spotlight, Dorsey seems to be having fun with these quick-turnaround projects.
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