Twitter co-founder Jack Dorsey is on an app-building spree. After releasing a Bluetooth-based messaging app referred to as Bitchat earlier this month, this weekend Dorsey revealed one other app referred to as Solar Day that ostensibly helps customers observe UV publicity and Vitamin D consumption.
The brand new app is available via TestFlight on iOS, and its code is on GitHub for anybody to clone.
Like different builders, Dorsey is using the vibe-coding bandwagon. However as an alternative of utilizing Cursor, Claude Code, or Windsurf, he says he’s utilizing an open-source coding device called Goose.
Solar Day is straightforward to make use of. It exhibits you the UV Index to your location together with particulars like cloud cowl, dawn, and sundown timings. You possibly can select your pores and skin sort from six choices, and how much clothes you’re carrying. Primarily based on these parameters, the app will calculate how lengthy you possibly can expose your pores and skin to daylight earlier than it begins to burn.
The app additionally exhibits your minimal vitamin D consumption. Begin a session by tapping on the “Monitor UV Publicity” button, and after the session is ended, the app will present how a lot vitamin D you’ve gained all through the session, and within the day.