Jack Dorsey launched Sun Day, an experimental app designed to help users track sun exposure and monitor UV levels from their smartphones. The app provides real-time insights into UV intensity, sunrise and sunset times, and cloud cover. Users can personalize their experience by selecting their skin type and clothing type to receive tailored sun exposure limits. Sun Day logs exposure sessions and estimates the amount of vitamin D synthesized, addressing public concerns about sun health and vitamin levels. The open-source nature of the app differentiates it from commercial products.
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.
One standout feature is the personalization layer; users can select their skin type and clothing type to estimate safe sun exposure before sunburn.
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