Latest news with #SunDay
Engadget
5 days ago
- Business
- Engadget
Jack Dorsey backs an open-source development collective with $10 million
Jack Dorsey has been back in the news lately after unveiling a pair of new apps he worked on, Bluetooth-based messenager Bitchat and UV exposure tracker Sun Day . The Block CEO put those together under the auspices of a new development collective called "and Other Stuff," a nonprofit that he is backing with a $10 million cash injection through his StartSmall foundation , as TechCrunch reports. The group plans to work on open-source projects, including ones that could become consumer social media apps, along with app-development tools. The developers met on Nostr, a social networking protocol Dorsey has also backed financially. The "and Other Stuff" collective aims to support Nostr's "transition from an experimental protocol to a widely adopted, sustainable ecosystem through collaborative growth and funding." In addition to Nostr projects, the collaborators plan to experiment with building tools based on the likes of ActivityPub — which powers Mastodon — and Cashu. That e-cash platform's creator, dubbed Calle, is part of the "and other Stuff" team alongside Twitter's first employee, Evan Henshaw-Plath. The projects that "and Other Stuff" has worked on so far include voice note app heynow, a private messenger app called White Noise and social community +chorus. They have also created Shakespeare, which is designed to help developers build Nostr-based social apps with AI. Dorsey has long fostered an interest in open-source protocols. In 2019, during his second stint as Twitter CEO, the company set up a team that was tasked with forming an open, decentralized standard for social media. Dorsey had hoped to eventually shift Twitter onto that protocol, but of course that didn't pan out. Instead, Twitter spun out that project — Bluesky — as a public benefit corporation in 2022. Last year, after leaving Bluesky's board, Dorsey claimed that the team there was "literally repeating all the mistakes" he made while running Twitter such as, uh, setting up moderation tools (which are, in reality, a critically important aspect of any successful social platform). On an episode of Henshaw-Plath's new podcast , Dorsey reiterated a point he had made previously, that Twitter was beholden to advertisers (an issue that X is contending with under Elon Musk's ownership ). "It's hard for something like [Twitter] to be a company, because you have corporate incentives when it wants to be a protocol," Dorsey said. "If [Twitter] were an open protocol, if it were truly an open project, you could build a business on top of it, and you could build a very healthy business on top of it." He was also once again critical of Bluesky's structure, adding that, "I want to push the energy in a different direction... which is more like Bitcoin, which is completely open and not owned by anyone from a protocol layer. That's what I see in Nostr as well. That's where I want to push my energy... rather into the more corporate direction, even if it is a public benefit corporation."
Fast Company
15-07-2025
- Entertainment
- Fast Company
Jack Dorsey's new Sun Day app tells you exactly how long to tan before you burn
Twitter cofounder Jack Dorsey is back with a new app that tracks sun exposure and vitamin D levels. Sun Day uses location-based data to show the current UV index, the day's high, and additional details like cloud cover, sunrise, and sunset times. Users can choose their skin type from six options and indicate their clothing, such as 'light (shorts & t-shirt)', then manually toggle when they're in or out of the sun. Based on this input, the app calculates how long you can safely expose your skin before it begins to burn. That's an especially helpful feature for those like Dorsey, who mentioned in an X thread that he does not actually use sunscreen. no — jack (@jack) July 13, 2025 The app also tracks a user's estimated vitamin D intake while outdoors. After tapping the 'Track UV exposure' button to start a session, the app shows how much vitamin D was absorbed once the session ends. In future updates, additional factors like height, weight, and actual vitamin D blood levels may be included to improve the app's accuracy. This marks the second new app Dorsey has launched in a week. But this one may especially appeal to Gen Z, whose tanning obsession has sparked a trend of tracking UV exposure to optimize time spent basking in the sun. In 2025, the importance of sunscreen isn't lost on most. Google searches for 'best anti-ageing sunscreen' and 'UV damage prevention' have more than doubled over the past two years. Yet on TikTok and Instagram, tanning is back in vogue. Girls flaunt their bikini strap marks, share their tanning routines, and even create sun tattoos (aka skin damage). Some are faking it using blush, bronzer, or spray tans to mimic the sunkissed, or sunburnt, look. Others track the UV index to find the 'best' time to tan.
Time of India
15-07-2025
- Health
- Time of India
Jack Dorsey launches Sun Day app to track UV exposure and Vitamin D levels using real-time UV and skin data; here's how it might benefit you
Source: Apple App Store Twitter co-founder Jack Dorsey has introduced a new application that merges health tech with sun exposure tracking as public interest in preventive health and digital wellness tools continues to grow. The app, called Sun Day, uses real-time UV data to estimate your Vitamin D synthesis, offering a personalised approach to sunlight exposure. Currently available in beta through TestFlight for iOS, the app reflects a broader trend toward using AI-powered health tools to improve lifestyle habits, boost immunity, and promote holistic well-being through smarter choices. Jack Dorsey launches Sun Day app to track Vitamin D levels in your body; here's how Sun Day uses location-based services to calculate your local UV index and sunlight duration. Once the user inputs their skin type, clothing coverage, and logs their sun exposure manually, the app estimates: How much Vitamin D your body may have produced How long you can safely stay in the sun without risking sunburn This tailored approach is especially relevant for individuals who may have Vitamin D deficiencies, such as those with limited outdoor time, darker skin tones, or higher latitudes with weaker sunlight. The app is part of Dorsey's experimentation with open-source and AI-based coding tools. The Sun Day project is publicly available on GitHub, allowing developers to contribute or build on the code. It was developed alongside Goose, an AI-assisted development tool also built by Dorsey's team. Both projects reflect his evolving role as a solo open-source developer exploring AI in health and communication. Why Vitamin D is crucial for your health Vitamin D is more than just a nutrient—it acts like a hormone in the body and supports multiple essential functions. by Taboola by Taboola Sponsored Links Sponsored Links Promoted Links Promoted Links You May Like Get ₹2Cr life cover@ ₹700 p.m. ICICI Pru Life Insurance Plan Get Quote Undo Its role in maintaining overall health is well-established, especially in the areas of immunity, bone strength, and emotional well-being. Strengthens the immune system Vitamin D helps regulate immune responses, allowing the body to better fight off infections. A deficiency can impair immune function, making individuals more susceptible to illnesses such as the common cold, flu, and respiratory infections. Maintains bone health and prevents osteoporosis Vitamin D enhances calcium absorption in the body, which is essential for building and maintaining strong bones. Without sufficient Vitamin D, bones can become weak and brittle, increasing the risk of fractures and conditions like osteoporosis and rickets. Supports mental and emotional well-being Low Vitamin D levels have been linked to mood disturbances such as depression and fatigue. In particular, it plays a role in regulating mood by influencing brain chemicals. This is especially important in regions with limited sunlight, where people are at higher risk for seasonal affective disorder. A preventive approach to modern lifestyle challenges For individuals living in areas with inconsistent sunlight or those who spend extended hours indoors, the app can serve as a preventive health tool. It empowers users to monitor and optimize their Vitamin D levels, helping reduce the risk of immune deficiencies, bone disorders, and mood-related issues commonly associated with modern indoor lifestyles. How the Sun Day app might help Source: Apple App Store Developed by Jack Dorsey, the Sun Day app provides personalised, real-time estimates of Vitamin D production. It uses location-based UV data along with user inputs like skin type, clothing coverage, and duration of sun exposure. Based on this information, it calculates how much Vitamin D the user may have synthesized and offers guidance on how long they can stay in the sun safely. This could mark an important development in the health sector, as the app encourages users to track their vitamin D levels, a nutrient essential for the body. It may also help prevent harmful effects of UV exposure, such as sunburn, skin damage, and serious conditions like skin cancer. Also Read | Hot dogs, sodas, and fast food could be stealing 36 minutes from your life, new study finds
Hans India
15-07-2025
- Health
- Hans India
Jack Dorsey Launches Sun Day App to Track Vitamin D and Sun Exposure
Twitter co-founder Jack Dorsey is back with another side project — this time, an app to help people track their vitamin D. After unveiling his encrypted messaging app Bitchat just last week, Dorsey has now launched Sun Day. This iOS app monitors sun exposure and vitamin D intake. Currently available through TestFlight, Sun Day's code is open-source on GitHub. The app utilises location data to display your local UV index and daylight hours. Users can log their skin type, clothing coverage, and toggle when they're in or out of the sun. The app then estimates your vitamin D levels for the day and suggests how long you can stay in direct sunlight safely. Dorsey says he's 'learning' through these weekend coding experiments, which he's building using Goose, an open-source AI coding tool. Tools like Goose are shaping up to be a hot space for tech's AI leaders — just last week, OpenAI's $3 billion attempt to buy Windsurf, another AI coding platform, fell apart after Google hired its CEO and key talent for DeepMind instead. The Twitter co-founder seems determined to keep 'vibe coding' alive — one quirky weekend app at a time.
Deccan Herald
15-07-2025
- Deccan Herald
After BitChat, Twitter co-founder comes up with app to track UV exposure, Vitamin D
Last week, Jack Dorsey unveiled an innovative Bluetooth-based messenger app, co-founder has come up with another creative app, Sun Day, which can help users track their exposure to Ultraviolet (UV) rays and Vitamin shared the news on X (formerly Twitter) that the Sun Day app is now available for iPhone users on the Apple App Store. For testers, the beta version can be accessed on Apple's TestFlight announces new AI tools to strengthen India's agriculture Dorsey is using a generative Artificial Intelligence (gen AI)-powered coding tool, Goose, to develop the app. The source code of the Sun Day Tracker app has been rolled out on GitHub for independent app developers to test run the Sun Day app can log a user's real-time UV exposure based on the location. It can even calculate Vitamin D based on UV. For this, the user has provided details such as skin type and also what clothes they are wearing on that particular will help the app to show how much the user was exposed to the UV and how much Vitamin D he/she gained on that app also displays Moon phase at night, Sunrise/sunset times and as the personal information will be linked with the Apple Health feature on iPhone. This way is fully protected against leakage of personal Sun Day app comes in small and medium widgets for the home screen of the Android version is yet to be developed. It is expected to be released in the coming Search: Gemini-powered AI Mode is now available to all users in the latest news on new launches, gadget reviews, apps, cybersecurity, and more on personal technology only on DH Tech.
