Expo raises $45M Series B as vibe-coded mobile apps surge 84% in App Store submissions

Expo raises $45M Series B

Expo, the mobile app development platform built on React Native and TypeScript, has raised a $45M Series B led by Georgian. The company has 62 people distributed globally. Charlie Cheever, who co-founded Quora before starting Expo, says the round is straightforward in its logic: Expo has become the default way to build mobile apps with AI, and there's more to build.

Why Expo is winning the vibe-coding moment

The core pitch has shifted over the past 18 months. Where Cheever would previously have said Expo lets web developers build great mobile apps, the argument now is that AI models are so well-trained on React, TypeScript, and JavaScript that they naturally reach for Expo when generating mobile code. App Store submissions are up 84% this quarter, and Cheever says most of those new apps are built on Expo.

What separates Expo from earlier JavaScript-on-mobile attempts like PhoneGap is the ability to drop seamlessly from TypeScript into native Swift or Kotlin wherever the product demands it. The analogy Cheever uses is a server-side codebase mixing Python and Rust: you write mostly in one language but reach for the other when performance or polish requires it. That flexibility is what lets Expo apps compete at the top of the App Store rather than feeling like wrapped web pages.

“App Store submissions are up sort of 84% this quarter. A lot of that is new Expo apps. A lot of those are vibe coded. What's happened over the last year or so is that Expo's sort of become the best way to make apps with AI — and so, it's just gotten really popular.”

Growth is still word-of-mouth, not agent-led

On whether coding agents are driving adoption, Cheever's view is nuanced. The decision to commit to a mobile stack is high-stakes and multi-year, so companies aren't delegating it to an AI. The pattern he describes is a developer showing up Monday morning with a six-screen prototype that impressed the CEO, built over the weekend on Expo, after an AI pointed them toward it. YouTube tutorials are also a major referral channel. AI is an accelerant to discovery, not the decision-maker.

What Expo looks for in engineers

With software generation becoming cheap, Cheever argues the bottleneck has moved from writing code to shipping software. The three things he screens for are taste (judgment about what's worth building and whether it's good), high APM (precision speed, borrowed from real-time strategy games), and high agency (getting things over the finish line through problems no manual covers). Writing code, he says, is no longer the hard part for a lot of companies. Getting software out the door, properly messaged, and iterated to match what customers actually need still is.

Apple and the distribution question

On the surge in App Store submissions, Cheever thinks the right model is already sitting inside Apple's own portfolio. Mac software can be distributed through the App Store or directly via the web, and the security model around the kernel is tight enough that neither developers nor users are materially frustrated. Applying that to iOS, he argues, would resolve most of the current rejection and policy friction. He treats the regulatory tension as a temporary dam, drawing the parallel to Uber working through early policy problems before ride-hailing simply became infrastructure.

Takeaway: Expo is the clearest infrastructure play on the vibe-coding boom in mobile. At 62 people and $45M in new capital, the bet is that React Native plus AI tooling creates a durable platform layer, provided Apple's distribution policies don't choke the supply of new apps before the market matures.