Sun Day offers an open-source approach, with its codebase published on GitHub, allowing developers to inspect or remix it, aligning with Dorsey's embrace of open-source tools.
Jack Dorsey's new Sun Day app tells you exactly how long to tan before you burn
Sun Day tracks sun exposure and vitamin D levels, providing real-time UV index, temperature, and safe sun exposure duration based on user-selected skin type and clothing.
37 Things That'll Make You Want To Put Your Phone Down And Get Outside
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