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A New Wave of Digital Tools From a Tech Icon
Jack Dorsey, the maverick co-founder of Twitter and former CEO of Block (formerly Square), is shaking up the tech landscape yet again. Just weeks after surprising the world with Bitchat, a Bluetooth-based messaging app challenging WhatsApp’s dominance, Dorsey has unveiled Sun Day, a wellness-focused mobile app that monitors users’ UV exposure and vitamin D levels. This unexpected one-two punch—one app targeting secure communication, the other optimizing personal health—highlights Dorsey’s deeper ambition: breaking centralization and putting users back in control of their digital and physical well-being. While Bitchat enables encrypted, offline messaging during blackouts and protests, Sun Day tracks sun exposure to avoid skin damage and promote better vitamin D absorption. With open-source transparency and a privacy-first ethos behind both projects, Dorsey is clearly building a future far beyond tweets.
Dorsey’s Dual Digital Vision: Health Meets Encrypted Freedom
The Wellness Tech Revolution Begins
Jack
Calculating the Right Dose of Sunshine
One standout feature is the vitamin D tracking tool, which begins when users tap “Track UV exposure.” The app monitors the session and reports back the estimated amount of vitamin D generated by the user during that timeframe. This can be a game-changer for people living in regions with limited sunlight or for individuals with specific health needs, such as those managing bone health or immune issues. Sun Day merges wearable-style insights with app-based convenience, making personal wellness easier and smarter.
Open-Source Engineering With a Twist
Dorsey, always a fan of transparency, is reportedly building this app with Goose, a lesser-known open-source coding tool rather than popular platforms like Cursor or Claude Code. This indicates his commitment to decentralization and independence from tech giants. Like Bitchat, Sun Day’s development follows a user-first, community-powered philosophy, echoing the ethos of Web3.
Meanwhile, a Messaging Revolution is Brewing
Simultaneously, Dorsey has launched Bitchat, a Bluetooth-based messaging platform aimed at ephemeral, encrypted peer-to-peer communication. Unlike WhatsApp or Messenger, Bitchat doesn’t rely on the internet. Instead, it forms mesh networks using Bluetooth clusters, allowing messages to hop between nearby devices even without Wi-Fi or cellular networks. This makes it ideal for situations like natural disasters, protests, or government shutdowns.
Goodbye Central Servers
Messages in Bitchat are stored only on users’ devices and vanish by default, ensuring maximum privacy. There’s no central server, no cloud storage, and no metadata mining. Optional group chats, protected by hashtags and passwords, add versatility for organizing communities or events securely. The project reflects Dorsey’s long-term goal of decentralizing digital infrastructure—a vision also seen in his work with Bluesky and Damus.
WhatsApp’s New Pricing Opens a Door
The release of these apps coincides with
What Undercode Say:
Tech Disruption is Dorsey’s New Religion
Jack Dorsey is no stranger to disruption. From pioneering microblogging with Twitter to shaking up finance with Block, he’s consistently launched tools that decentralize power and challenge the status quo. The simultaneous release of Sun Day and Bitchat feels like more than a coincidence—it’s a strategic move targeting two major vulnerabilities in today’s digital ecosystem: health data ignorance and centralized communication systems.
On one hand, Sun Day taps into the booming healthtech industry, but with a minimalist twist. Rather than selling data to third parties or tying it to a wearables ecosystem, Dorsey keeps the app open-source and self-hosted. That’s a bold bet on transparency and user autonomy. It’s also a direct counterpoint to big-tech health platforms that tend to monetize biometric data.
Meanwhile, Bitchat brings an experimental flavor to secure communication. Unlike Signal or Telegram, it avoids any need for the internet altogether. This “offline internet” is essentially a new frontier, offering value in regions facing censorship, surveillance, or natural disasters. Think of it as digital guerrilla warfare—a way for people to stay connected under any circumstance.
What’s fascinating is how both apps run parallel to
Furthermore, the use of Goose instead of mainstream development tools adds an underground, hacker-style aesthetic to Sun Day. It positions Dorsey’s projects as not just alternatives—but resistance movements against corporate infrastructure. This isn’t just about innovation. It’s about building sovereign digital spaces.
With these apps, Dorsey seems to be issuing a challenge: “Build tools that work without the cloud, collect no data, and survive even when networks are down.” If he succeeds, both Sun Day and Bitchat could set off a chain reaction in their respective domains, encouraging developers, entrepreneurs, and health advocates to rethink the role of software in a post-centralized world.
While it’s too early to tell how widely adopted these apps will become, the message is clear: the tech revolution isn’t just digital—it’s personal, private, and off-the-grid.
🔍 Fact Checker Results
✅ Sun Day is confirmed live on iOS TestFlight and GitHub
✅ Bitchat does operate through Bluetooth mesh without Wi-Fi
✅ WhatsApp’s per-message business billing started July 1, 2025 🧾
📊 Prediction
Expect Sun Day to gain rapid traction among biohackers, fitness influencers, and vitamin D enthusiasts, especially in northern climates. Bitchat, however, has more disruptive potential long-term. With rising concerns over surveillance and platform overreach, the demand for offline, encrypted messaging will likely explode in politically unstable regions. If Meta continues aggressive monetization, Dorsey’s anti-centralized crusade could finally hit the mainstream. 🔮
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