NEWS

Jack Dorsey Launches ‘Sun Day’ App to Track Sun Exposure and Vitamin D Intake

Published

3 weeks ago

July 15, 2025

Twitter CEO Jack Dorsey has unveiled Sun Day, a new app designed to help users monitor their sun exposure and estimate vitamin D intake.

The launch comes shortly after the release of Bitchat, another innovation from Dorsey that enables messaging without internet access.

Sun Day uses a phone’s location to determine the local UV index, allowing users to manually track their time in the sun and calculate estimated vitamin D levels based on factors such as skin type, clothing, and geographic location.

The app also offers useful data, including sunrise and sunset times, cloud coverage, and personalized burn limits, all based on real-time UV conditions.

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WALE BUSARI

Hi, I’m Babawale Busari — a passionate storyteller, content creator, and observer of the world around me. I share compelling stories, current events, digital trends, and insightful commentary that spark thought and conversation. Whether it’s news, culture, tech, or everyday experiences, I believe every detail matters. Thanks for stopping by — let's explore the world, one post at a time.