Jack Dorsey, co-founder of Twitter and CEO of Block, has unveiled a new application named ‘Sun Day’ designed to help users monitor their sun exposure and vitamin D levels. This release follows closely on the heels of ‘Bitchat,’ a Bluetooth-based messaging app Dorsey introduced earlier this month.
‘Sun Day’ is currently available for iOS users through TestFlight, Apple’s platform for beta testing apps. Additionally, Dorsey has made the app’s source code accessible on GitHub, allowing developers and enthusiasts to explore and modify the application.
In a recent post, Dorsey highlighted the app’s purpose:
> track your (vitamin) D a Sun Day app for Sunday.
The ‘Sun Day’ app offers a user-friendly interface that provides real-time data on the UV Index specific to the user’s location. It also displays pertinent information such as cloud cover, sunrise, and sunset times. Users can input personal details, including their skin type—choosing from six predefined categories—and the type of clothing they are wearing. Based on these inputs, the app calculates the optimal duration one can safely stay in the sun before the risk of skin damage increases.
Beyond monitoring sun exposure, ‘Sun Day’ estimates the user’s vitamin D synthesis during sun exposure sessions. By initiating a session with the Track UV Exposure feature and concluding it upon returning indoors, the app provides an estimate of the vitamin D produced during that period and cumulatively throughout the day.
Dorsey’s recent ventures into app development reflect his ongoing commitment to health and wellness. His personal routines, such as alternating between ice baths and sauna sessions, walking five miles to work, and practicing intermittent fasting, have been well-documented. These practices underscore his dedication to physical and mental well-being.
The development of ‘Sun Day’ also showcases Dorsey’s engagement with the tech community’s latest trends. He has been utilizing an open-source coding tool called Goose, aligning with the current vibe-coding movement that emphasizes collaborative and transparent software development.
In addition to ‘Sun Day’ and ‘Bitchat,’ Dorsey has been involved in other tech initiatives. Notably, he has been working on ‘Bluesky,’ a decentralized social media platform aimed at providing users with more control over their online interactions. This project reflects his vision for a more open and user-centric internet.
The introduction of ‘Sun Day’ aligns with a growing public interest in health monitoring applications. As individuals become more conscious of their health metrics, tools that provide personalized insights, such as UV exposure and vitamin D levels, are gaining popularity. Dorsey’s latest app caters to this demand by offering a straightforward solution for users to manage their sun exposure effectively.
In summary, Jack Dorsey’s ‘Sun Day’ app is a testament to his innovative approach to technology and health. By combining real-time environmental data with user-specific inputs, the app empowers individuals to make informed decisions about their sun exposure and vitamin D intake, contributing to overall well-being.
