<ul data-eligibleForWebStory="false"><li>Twitter co-founder Jack Dorsey has launched a new app named Sun Day, designed to track sun exposure and vitamin D levels based on UV index and skin type.</li><li>The app, available for iOS via TestFlight, uses location-based data to show the local UV index and sunlight hours, allowing users to input details like skin type and clothing level.</li><li>Users can manually switch between being in and out of the sun, with the app monitoring their vitamin D levels for the day and suggesting a safe duration for direct sunlight exposure to avoid burning.</li><li>Jack Dorsey is using open-source AI coding tool Goose for his coding projects and the development of apps like Sun Day, reflecting the growing importance of such tools in the tech industry.</li></ul>

Now Jack Dorsey has built an app to track your vitamin D

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