Jack Dorsey's Sun Day App: Revolutionizing Vitamin D Tracking
Introduction
Technology has made it easier for us to track our health and wellness, and now, Jack Dorsey has taken it a step further with his new app, Sun Day. This app is designed to track your vitamin D levels by using sunlight exposure as a measure. With Dorsey's expertise in coding and his passion for health and wellness, this app is bound to be a game-changer for those looking to optimize their vitamin D intake.
The Inspiration
Sun Day is not just a regular app, but it is a result of Dorsey's personal interest in optimizing his own health. As the CEO of Twitter and Square, Dorsey has a busy schedule and found it challenging to track his vitamin D levels. This inspired him to develop an app that would not only make it easier for him but for others as well.
The Technology
To create Sun Day,
About the People Mentioned
Jack Dorsey
Jack Dorsey is an American entrepreneur and software developer best known as a co‑founder of Twitter (now branded X) and co‑founder and long‑time leader of the financial‑technology company Block, Inc. (formerly Square). He was born November 19, 1976, in St. Louis, Missouri, and developed an early interest in dispatch systems and programming, which influenced his later projects[1][3].[1] Dorsey helped create Twitter in 2006 while working with Odeo/Obvious and served as the company’s first chief executive officer in 2007–2008 and again from 2015 until his 2021 resignation as CEO; Twitter grew under his leadership into a global realtime social platform[1][3].[1] In 2009–2010 he co‑founded Square with Jim McKelvey, a payments and merchant services company that popularized small‑business card acceptance via mobile devices; Square later rebranded as Block and expanded into broader financial and crypto products[1][3].[1] Throughout his career Dorsey has been associated with several tech initiatives beyond Twitter and Block, including founding the decentralized social‑media project Bluesky and maintaining interests in cryptocurrencies and decentralized protocols[1][3].[1] His work made him a notable figure in Silicon Valley, and he has been a prominent public voice on product design, moderation, payments, and internet decentralization[3][6].[3] Dorsey’s tenure attracted both praise for innovation and criticism over platform governance and leadership style; he stepped down as Twitter CEO in 2021 and continued as Block’s CEO, guiding the company through product expansion and crypto experiments[1][3].[1] As of mid‑2025, major business profiles continue to list him as a significant technology executive and entrepreneur with substantial personal wealth derived from his holdings in the companies he helped build[1][3].[1] Sources: biographical and company profiles summarizing Dorsey’s roles at Twitter/X and Block/Square and his founding activities and public relevance[1][3][6].[1]
About the Organizations Mentioned
Twitter, now rebranded as X, is a global communications company based in San Francisco that operates a social media and microblogging platform where users post short messages called tweets, limited to 280 characters[1][3]. Founded in 2006, Twitter quickly became a vital platform for real-time public conversation, news dissemination, and social commentary, serving a broad user base including businesses, journalists, politicians, and celebrities[2][3]. Elon Musk acquired Twitter in October 2022 for $44 billion, privatizing the company and merging it into X Corp., marking a strategic rebranding aimed at transforming Twitter into an AI-powered “super app” that integrates social media, content, AI tools, and financial transactions in one platform[1][3]. This transition ended Twitter’s existence as a standalone company and led to substantial operational changes, including reduced content moderation, workforce reductions, and new monetization models like subscription services and creator monetization[1][3]. As of 2025, X (Twitter) has around 561 million monthly active users globally, with approximately 132 million daily active users, though user engagement has declined since Musk’s takeover[4][5][6]. The platform remains influential, particularly for real-time updates, professional networking, and viral content sharing, distinguishing itself from competitors like Facebook, Instagram, and TikTok through its focus on public discourse and newsworthiness[2]. However, the shift in content policies and the introduction of paid verification have driven advertisers away, causing a significant drop in advertising revenue despite overall growth in subscription income[1][6]. Twitter’s core value lies in its open conversation model, which fosters debate and information exchange at scale. Its evolution into X represents an ambitious vision to become a multifunctional digital hub, balancing its legacy as a microblogging pioneer with cutting-edge AI-driven innovations under Musk’s leadership[1][3].
Square
**Introduction to Square** Square is a pioneering financial technology company that has revolutionized the way businesses operate by providing comprehensive solutions for payments, commerce, and financial services. Founded in 2009 by Block, Inc., Square's mission was to empower all types of businesses to accept credit card payments, thereby democratizing access to financial services for small and medium-sized enterprises. **History and Growth** Square's journey began with the invention of the first mobile card reader, which allowed businesses to process payments anywhere. This innovation disrupted traditional payment systems and marked the beginning of Square's expansion beyond payment processing. Over the years, Square has introduced various tools and services, including e-commerce capabilities, inventory management, customer appointments, payroll processing, and business loans. Notable milestones include the launch of Square Register in 2017 and the introduction of Square Financial Services in 2021, which enabled the company to offer business loans directly. **Current Status and Achievements** As of 2024, Square is the U.S. market leader in point-of-sale systems, serving over four million sellers and processing $228 billion annually. It operates in eight countries, including the U.S., Australia, Canada, France, Japan, Ireland, Spain, and the U.K. Square's operating system supports businesses in managing operations, communicating with customers, and enhancing customer experiences. The company has recently unveiled a new product roadmap, focusing on features like ACH payments and inventory synchronization with Shopify, and plans to incorporate bitcoin payments. **Notable Aspects and Future Directions** Square's impact extends beyond payment processing; it provides valuable insights into consumer trends and business strategies through its annual reports. The 2025 Future of Commerce report highlights businesses' focus on automation and loyalty programs to combat economic challenges. Square continues to innovate, offering solutions like remote device management and improved network connectivity to ensure reliability and efficiency. With its global presence and commitment to innovation, Square remains at the forefront of business technology, shaping the future of commerce and financial services
