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Former Twitter CEO Jack Dorsey is venturing into health tech with ‘Sun Day,’ a new iOS application designed to help users monitor and optimize their vitamin D levels. The app utilizes AI, powered by the open-source coding tool Goose, to track sun exposure based on location data, including the local UV index and sunlight hours. Users input personalized information such as skin type and clothing to receive tailored estimates of vitamin D synthesis and safe sun exposure durations. The release of ‘Sun Day’ follows Dorsey’s recent launch of the encrypted messaging app Bitchat, demonstrating his continued exploration of emerging technologies and AI’s potential applications.