Jack Dorsey’s new app tracks how much grass you’re touching
2025-07-14 06:27:36
Main Idea
Jack Dorsey launched a new app called 'Sun Day' that calculates vitamin D synthesis from UV exposure based on user inputs like location, age, clothing, and skin tone.
Key Points
1. The 'Sun Day' app uses a multifactor model based on scientific research to estimate vitamin D synthesis from UV exposure.
2. Users must manually input data such as location, age, clothing type, and skin tone for the app to function.
3. The app is currently available in beta via Apple's TestFlight and App Clips for user feedback.
4. This is Dorsey's second app launch in two weeks, following another beta release the previous weekend.
Description
Sun Day is the second app that the Twitter co-founder has launched in the last week, and it was built using Block’s artificial intelligence assistant, Goose.
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