Jack Dorsey’s new app tracks how much grass you’re touching

Block CEO and Twitter co-founder Jack Dorsey has launched a new app that gives users a rough idea of how much exposure they’ve had to the sun

Dorsey shared the “Sun Day” app to his followers on X on Sunday, which, according to its white paper on GitHub, “calculates vitamin D synthesis from UV exposure using a multifactor model based on scientific research.”

Beta version available through TestFlight

It is available through Apple’s TestFlight app, which allows developers to test beta versions of their apps and App Clips to get feedback from users before an official release

The app uses location services to track the current UV index and estimate sun exposure based on the user’s location. It also asks for input on age, type of clothing being worn and individual skin tone

It also factors in other data from the Apple Health app and historical data such as HealthKit vitamin D records

Source: Jack Dorsey“The app aims to provide personalized, accurate estimates while remaining conservative for safety,” its white paper states

Sun Day requires manual input to work

The app requires a user to input data manually. Users will need to tap a button when they’re exposed to the sun and again once they are back indoors

“[...] doesn’t look for light. It’s a manual on/off toggle,” Dorsey said in response to a user’s question on X, explaining to another that the app logs after each session

Source: Jack Dorsey There are also several improvements flagged for the future. The white paper lists using more precise calculations based on height and weight, along with seasonal adjustments and the user’s actual vitamin D blood tests as possible updates

Dorsey’s second app in two weeks

Last weekend, Dorsey launched the beta version of a new decentralized peer-to-peer messaging service known as Bitchat, which runs entirely over Bluetooth.

At the time, he said his weekend was spent learning about “Bluetooth mesh networks, relays, store and forward models, message encryption models, and a few other things.”

Related: Jack Dorsey pushes Signal to adopt Bitcoin payments

In a post on Sunday, Dorsey told a user who asked if the app launches were part of a plan to flood the market and see what sticks that “Nah. I’m learning.”

He also revealed that he was using Block’s artificial intelligence assistant, Goose, to create the apps

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