I’ll admit, I didn’t expect to spend my Sunday pondering sunburn risk and peer-to-peer chatting, but here we are. Jack Dorsey, the man who helped shape Twitter (before it became X), just dropped not one but two surprise apps in July 2025. And honestly? The vibe is less about flashy launches and more about quietly challenging how we think about innovation, privacy, and that fine line between speed and substance.
From Sunburns to BitChat: Jack Dorsey’s Rollercoaster Week
Jack Dorsey’s July 2025 has been anything but quiet. In the span of just seven days, he dropped not one, but two new apps—each with its own twist and a heavy dose of “vibe coding.” If you’ve been following Jack Dorsey’s new app adventures, you’ll know he’s not just chasing trends; he’s setting them, especially with the help of his AI sidekick, Goose.
Let’s start with Sun Day, which landed on iOS TestFlight on July 14, 2025. This isn’t your average vitamin D tracking app. Sun Day promises smarter sun safety by blending scientific data and AI. It calculates how long you can safely soak up rays, factoring in UV index, cloud cover, your skin tone, and even what you’re wearing. The goal? To help you avoid sunburn while optimizing vitamin D synthesis. I’ll admit, it reminds me of the time I downloaded a weather app for a single beach day, then promptly forgot it existed. These wellness apps are only as clever as how you use them, right?
But Dorsey wasn’t done. Just a week before, he launched BitChat—a peer-to-peer messaging app that works entirely over Bluetooth mesh networking. No phone numbers, no emails, and absolutely no central servers. BitChat lets you chat with people nearby, even if you’re off the grid. It’s privacy-first, decentralized, and doesn’t require any registration. Research shows this kind of Bluetooth mesh networking can enable resilient, offline communication—ideal for festivals, protests, or anywhere the internet’s flaky.
Both Sun Day and BitChat were built using Goose, Block’s quirky AI coding assistant. Dorsey calls his process “vibe coding,” which is all about working with AI to build apps quickly, guided more by intuition than rigid specs. It’s a bold approach, but not without risks. As Alex Radocea, CEO of Supernetworks, put it:
“In cryptography, details matter. A protocol that has the right vibes can have fundamental substance flaws that compromise everything it claims to protect.”
BitChat’s own GitHub warns it hasn’t had a full security review yet, so while the vibes are strong, the tech community is watching closely. Still, Dorsey’s rapid-fire launches with Goose show just how fast AI-driven “vibe coding” is changing the way we build—and use—apps.
BitChat: A Decentralized Messaging Experiment That Dances on the Edge
Let’s talk about BitChat—the Bitchat Bluetooth app that’s got everyone in the decentralized messaging world buzzing. Jack Dorsey, fresh off his Twitter (now X) legacy, dropped BitChat as part of his wild week of app launches. What makes BitChat so different? For starters, it skips the internet entirely. Instead, it uses a Bluetooth mesh network to let your messages hop from device to device, no phone numbers or emails required. It’s almost like passing notes in class, but with end-to-end encryption and a 300-meter range (thanks to multi-hop relays).
This isn’t just about cool tech—it’s about privacy features that actually matter. BitChat doesn’t ask for registration, permanent IDs, or personal info. You get ephemeral peer IDs, local message storage (with optional retention), and even a “panic mode” that wipes your data instantly if things get dicey. There’s also support for password-protected channels, which is perfect if you’re chatting at a music festival, in a disaster zone, or anywhere with sketchy (or no) signal. Basically, it’s offline communication for when you want privacy and zero infrastructure.
But here’s where things get interesting—and a little controversial. BitChat is built on what Dorsey calls “vibe coding,” a rapid, AI-assisted development style using Block’s Goose AI. It’s fast, experimental, and, honestly, kind of fun. But security experts are raising their eyebrows. The protocols behind BitChat haven’t been formally reviewed, and the app’s own GitHub page warns that “strong vibes don’t guarantee airtight security.” As Alex Radocea, CEO of Supernetworks, put it:
“In cryptography, details matter. A protocol that has the right vibes can have fundamental substance flaws that compromise everything it claims to protect.”
So, while BitChat enables secure, private conversations without the internet—using adaptive mesh routing and privacy-preserving features—there’s a catch. Research shows that, despite its promise, experts recommend caution until formal security audits are done. Sometimes, “vibes” don’t equal verified security. Still, if you’re looking for a new way to connect off the grid, BitChat is definitely pushing the envelope in decentralized messaging.
Goose, “Vibe Coding,” and the Curious Ethics of Building Fast
If you’ve ever tried to bake bread without a recipe—just “by vibes”—you know the thrill and the risk. Sometimes you get something delicious, sometimes you get… well, a learning experience. That’s exactly the spirit behind Jack Dorsey’s latest approach to app development, powered by the AI coding assistant Goose from Block. Both of his new apps, Sun Day and BitChat, were built using this “vibe coding” philosophy, and honestly, it’s shaking up how I think about building tech.
Goose, Block’s natural-language AI coding assistant, lets developers code by feel. Instead of sweating every technical detail, you just describe what you want in plain English—like asking a friend for help. The result? Both Sun Day and BitChat shipped within a single week, which is lightning-fast compared to most major tech rollouts. This is the heart of AI-driven app development trends right now: speed, intuition, and a focus on user experience over perfection.
But here’s where it gets tricky. Vibe coding means you can prioritize the product’s “vibe”—how it feels, how fun or useful it is—over exhaustive code reviews and technical nitpicking. That’s great for creativity and rapid prototyping. It’s also a bit like baking bread without measuring: you might end up with something amazing, or you might miss a crucial ingredient. In tech, those missing ingredients can mean unpolished features, security trade-offs, or privacy features that aren’t fully baked.
Take BitChat, for example. It’s a Jack Dorsey new app that lets users message over Bluetooth mesh networks, with no phone numbers or emails required. Privacy features like end-to-end encryption and ephemeral peer IDs sound great, but as security experts have pointed out, skipping deep security reviews can leave big gaps. As one critic put it, “A protocol that has the right vibes can have fundamental substance flaws that compromise everything it claims to protect.”
This whole “move fast and break things” approach is fueling fierce debates in tech circles. Is it responsible innovation, or just reckless? Dorsey, with Goose and vibe coding, is right in the middle of that whirlwind—pushing boundaries, but also forcing us to ask: what do we risk when we build by feel?
Wild Card: Picturing a Future Where Apps Feel More Human Than Human
If there’s one thing Jack Dorsey’s wild week of launches has made clear, it’s that we’re standing at the edge of a new era in app development—one where “vibe coding” isn’t just a quirky phrase, but a real design philosophy. Imagine opening an app that gets your mood, that knows when you’re stressed and quietly holds back notifications until you’re ready. That’s not just a technical leap; it’s a shift toward apps that feel almost human, blending intuition with function.
Dorsey’s latest projects, Sun Day and BitChat, are more than just clever tools—they’re experiments in privacy-first design and peer-to-peer messaging that challenge the old norms. With BitChat, for example, the idea of offline communication isn’t just a backup plan for when Wi-Fi fails. It’s the main event. No central servers, no phone numbers, no personal identifiers. Just people, talking directly, even in the middle of a music festival or a disaster zone. It’s a future where “central servers” might sound as outdated as floppy disks.
What really stands out to me is how Dorsey’s approach, powered by AI assistants like Goose, is all about gut-feel coding. He’s not just chasing features—he’s chasing a feeling. The intersection of AI and human intuition is starting to blur the lines between what’s functional and what’s emotional. As the article puts it, “We develop not just for function, but for feeling—let the machines learn to vibe with us, not the other way around.”
Research shows that this human-centric, vibe-driven development could totally redefine what we expect from our apps. We’re talking about experiences that are not only intuitive but also fiercely protective of our privacy. Sure, there are risks—BitChat’s security concerns remind us that innovation can outpace caution. But maybe that’s the point. We’re in a moment where the “vibe” of technology matters as much as its task, and Dorsey’s experiments are nudging the whole industry to catch up.
So, as we look ahead, I can’t help but wonder: What if the next wave of apps really does feel more human than human? Maybe, just maybe, we’ll let the machines learn to vibe with us.
TL;DR: Jack Dorsey’s two new apps—Sun Day and BitChat—embody his experimental push into AI-assisted, privacy-first tech. Want cutting-edge chat without the internet, or sun exposure advice smarter than your weather app? With Dorsey, it’s all about exploring the edges and accepting some risks for the sake of fast, feel-driven progress.
