Jack Dorsey Launches Sun Day App to Track UV Exposure and Vitamin D Intake
Twitter co-founder Jack Dorsey has been busy building new apps lately. Following the release of the Bluetooth-based messaging app Bitchat earlier this month, Dorsey has now unveiled another app called Sun Day. This app is designed to help users track their UV exposure and Vitamin D intake.
The Sun Day app is currently available for testing on iOS through TestFlight, and its code can be found on GitHub for developers to explore and clone.
Like many other developers, Dorsey is jumping on the trend of vibe-coding. However, instead of using popular tools like Cursor or Windsurf, he has opted for an open-source coding tool called Goose.
The Sun Day app is user-friendly and provides valuable information. It displays the UV Index for the user’s location, along with details such as cloud cover, sunrise, and sunset times. Users can select their skin type from six options and indicate the type of clothing they are wearing. Based on these inputs, the app calculates the safe duration for sun exposure before the risk of sunburn.
Additionally, the app helps users track their minimum vitamin D intake. By initiating a session with the “Track UV Exposure” button, users can monitor their vitamin D levels gained during the session and throughout the day.
Overall, Sun Day is a useful tool for individuals looking to manage their sun exposure and Vitamin D intake effectively. With its intuitive interface and valuable features, this app is a great addition to Jack Dorsey’s app-building portfolio.
