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

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Well, folks, hold onto your hats—Jack Dorsey, the man who brought you Twitter and Block, is now aiming to track how much sunshine you’ve soaked up. Yes, you read that right: the CEO himself has launched an app that attempts to quantify your sun exposure. As if you weren’t already aware that the sun was a big ball of fire in the sky, now there’s an app for that.

He calls it “Sun Day”—and no, it’s not about a relaxing day at the beach. Dorsey shared this gem with his followers on X (formerly Twitter, let’s not get into that), and according to its lofty white paper on GitHub, it “calculates vitamin D synthesis from UV exposure using a multifactor model based on scientific research.” Sounds like the future, doesn’t it? Or at least a very niche hobby.

Beta Version Available (Because Everyone Loves a Beta Version)

The app’s currently available through Apple’s TestFlight, because what better way to test an app than to let users take it for a spin before it’s “officially” ready? After all, what’s the worst that could happen? Maybe your skin turns an alarming shade of purple.

Now, don’t get too excited—this app isn’t some magical device that automatically knows when you’re basking in the rays. No, no. It uses your location services to estimate the UV index and, in true tech fashion, asks you to manually input your age, clothes, and skin tone. Oh, and it also wants to know about your vitamin D records. Why? Because why not gather as much data as possible while you’re at it, right?

As Dorsey himself puts it, the app’s goal is “to provide personalized, accurate estimates while remaining conservative for safety.” Safety? When did we start playing it safe in tech? But I digress.

Manual Input for Maximum Fun

Don’t you love when an app asks for your input—no, really, you’ve got to press a button every time you step outside and again when you come back indoors. So it’s like a light switch for the sun. Yes, the app doesn’t look for light, it just waits for your manual toggle. Welcome to 2025, where toggling switches to track sun exposure is the new frontier of convenience.

And it doesn’t stop there. The white paper hints at more updates, including more precise calculations based on your height, weight, and maybe—just maybe—your blood tests. So, your sun-soaking adventures might soon be detailed in ways that would make even the most hardcore scientists blush.

Two Apps in Two Weeks: Is Dorsey the New App King?

Oh, and let’s not forget, this is Dorsey’s second app launch in two weeks. The first? A little thing called Bitchat—a decentralized peer-to-peer messaging service that runs over Bluetooth. Yes, Bluetooth. Because who needs Wi-Fi when you’ve got Bluetooth mesh networks and relays? As Dorsey himself said, “I’m learning,” which is code for “I’m probably going to disrupt something else soon.”

And if you’re wondering whether these app launches are part of a grand strategy to flood the market and see what sticks, Dorsey’s got an answer for you: “Nah. I’m learning.” Well, learning or plotting world domination, we can’t be sure.

As for how he’s making all these apps? Why, with the help of Block’s artificial intelligence assistant, Goose. Apparently, Goose is now the secret weapon behind his tech empire. Who knew?

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2025-07-14 09:27