Rork vs Bolt: Which AI Builder Fits Your Mobile App?

Rork and Bolt both turn a prompt into an app, but they are built for different first destinations. Rork is now a mobile specialist that writes native Swift for iPhone and Kotlin for Android, runs your app in a cloud simulator next to the chat, and submits builds to TestFlight and the App Store. Bolt is a browser-based builder for web apps that reaches mobile through Expo, so one JavaScript codebase can become a web app and an iOS and Android app. If your product lives on the phone, Rork fits more naturally; if it lives on the web with a mobile companion, Bolt does. Whichever you choose, the biggest quality lever is the same: give the builder a finished visual target, such as a free VP0 design link, instead of asking it to invent the interface.

What Rork is in 2026

The most important fact about Rork is one many comparisons still get wrong. Rork used to generate Expo apps, which are React Native under the hood. Its own documentation now explains what happened to Expo: internal benchmarks showed the agent writes better Swift apps, so new iPhone projects are native Swift with SwiftUI, Android projects are Kotlin, and web projects are React with Vite. Existing Expo projects keep working.

That change matters for anyone choosing between the two tools. A native Swift app gets Apple’s own UI components, system behaviours and performance characteristics without a bridge layer. The trade-off is that iPhone and Android become two codebases rather than one, even if Rork manages both from a single project.

Around the code generation, Rork has built a mobile-focused workflow. It runs iPhone apps on a cloud iOS simulator beside the chat, has a design mode that draws screens before any code exists, an element selection feature for pointing at the part you want changed, and store tooling that includes an AI App Store reviewer and a screenshot generator. Its documentation describes the native iPhone build flow from simulator to TestFlight and the App Store, and its Max tier adds an iPhone app for building and installing on the go.

What Bolt is in 2026

Bolt, from StackBlitz, is a browser-based AI builder that generates JavaScript projects: websites, web apps, dashboards and internal tools, with a Node.js backend and either its own Bolt Cloud database or Supabase. Mobile is a mode rather than the default. Bolt’s Expo documentation says to mention “mobile app” in your very first prompt, because projects created for the web do not easily switch over later.

Once a project is set up as a mobile app, Bolt lets you scan a QR code with Expo Go to try it on your own phone, and documents building and publishing to TestFlight, the App Store, Google Play and the web through Expo Application Services. One codebase serves every platform, which is the main appeal of Expo and React Native in general.

Bolt also syncs to GitHub, supports design system imports from a repository or Storybook, and runs in any Chromium browser, with some differences in Safari. Our older Lovable vs Bolt comparison covers how it stacks up against the other big web-first builder, and Lovable vs Base44 covers the most integrated alternative.

How do Rork and Bolt compare side by side?

Criteria	Rork	Bolt
First destination	iPhone and Android apps	Web apps, with mobile via Expo
iPhone code	Native Swift with SwiftUI	React Native through Expo
Android code	Native Kotlin	Same React Native codebase
One codebase for all platforms	No, separate native projects	Yes
Preview	Cloud iOS simulator in the browser	Browser preview, Expo Go on your phone
Path to the App Store	Built-in TestFlight and App Store submission	Expo Application Services
Backend	Rork Backend, Supabase for some auth	Bolt Cloud database or Supabase
GitHub	Two-way sync	Sync and backup
Best for	Phone-first consumer apps	Web products that also need an app

The table hides one subtle point: the one-codebase question cuts both ways. A single Expo codebase is cheaper to maintain if your app is the same on every platform. Native projects feel more at home on each platform and avoid a class of cross-platform bugs, but every feature has to exist twice.

Which produces better-looking apps?

Neither, by default. Both tools generate competent interfaces that look like every other AI-generated app: the same card layouts, the same spacing, the same safe colour palette. The why AI apps look generic post explains why. The model averages what it has seen, so without a specific target it produces the average.

The fix is identical for both tools: give the builder a finished design to match rather than a description to interpret. That is what VP0 exists for. A free VP0 design link gives Rork, Bolt, Claude Code, Cursor or Lovable an exact visual target, so the agent’s job changes from inventing a look to reproducing one. Rork’s design mode and Bolt’s design system import both benefit from the same idea: the more concrete the visual input, the less generic the output.

For native Swift in Rork, a reference that respects iOS conventions matters more, because SwiftUI apps that ignore platform patterns look odd quickly. For Expo in Bolt, a reference that works on both platforms keeps the shared codebase from looking like an iPhone app forced onto Android.

What does a day of building feel like in each?

The tools feel different in the loop you repeat fifty times a day: ask for a change, look at the result, ask again.

In Rork, the result appears on a simulated iPhone next to the chat. You point at a button with element selection, describe the change, and watch the native screen update. Because the code is SwiftUI, small visual requests such as spacing, typography and navigation behave the way iOS users expect without extra prompting. The friction shows up when you want the Android version to match, since that is a separate Kotlin project the agent has to keep in step.

In Bolt, the default preview is a browser window. For a mobile project you switch to the device preview and scan a QR code, and the app reloads on your phone through Expo Go. The loop is quick for layout and logic. The friction shows up in platform details: a gesture or a keyboard behaviour that works on one platform and needs adjusting on the other, because one codebase serves both.

Neither loop is better in the abstract. Builders who care most about how the iPhone version feels tend to prefer Rork’s loop; builders who care most about shipping the same product everywhere tend to prefer Bolt’s.

How do they handle publishing?

Publishing is where Rork’s mobile focus shows most. It runs the build, uploads to TestFlight and helps with store screenshots and a pre-submission review pass, so a first-time founder never opens Xcode. Its documentation lists TestFlight distribution step by step.

Bolt hands mobile publishing to Expo Application Services, which is the standard path for Expo apps and works well, but involves more concepts: build profiles, credentials and store submissions. Bolt’s documentation walks through it, and the process is the same one many professional React Native teams use.

Both still require your own Apple developer account, and both apps must pass Apple’s App Review Guidelines. Neither tool can promise approval. Our AI app launch checklist covers what reviewers reject most often, from placeholder content to missing account deletion.

What about code ownership and leaving later?

Both tools sync with GitHub, so you can keep a copy of the code in your own account. The practical difference is what that code is.

A Rork iPhone project is a native Swift codebase you can open in Xcode, and Rork documents an optional workflow for exactly that. A developer who knows SwiftUI can pick it up. A Bolt mobile project is an Expo codebase a React Native developer can pick up, and the web version is ordinary JavaScript. We cover each tool’s export story in does Rork export clean code and does Bolt own my code.

The question to ask before building is who will maintain the app in a year. If you expect to hire, hire for the stack the tool produces.

How do costs compare?

Both have free entry points and paid plans that meter AI usage. Rork’s documentation says its free plan covers designing your app, with building and publishing on paid plans; its pricing page lists Rork Pro at $20 a month and Rork Max from $200 a month. Bolt meters usage in tokens across its plans.

In practice the bill depends on iterations, not on the plan name. An app that is well specified from the start, with a clear design target and a short feature list, uses a fraction of the generations that an app built by trial and error does. That is the strongest economic argument for starting with a finished design: fewer rounds of “make it look better”.

Which should a beginner pick?

For a first app that is clearly a phone app, a habit tracker, a fitness log, a small game, Rork is the more direct path. The simulator, TestFlight flow and store tooling remove most of the steps that stop beginners.

For a first product that is a web app, a booking tool, a client portal, a SaaS dashboard, where a mobile app might come later, Bolt fits better, because the web version is the real product and Expo keeps the mobile option open from the same code.

And if you are not sure, start by designing. Pick or adapt a screen design first, decide what the app actually does on its three most important screens, and then choose the builder that fits that answer. The best AI app builder roundup covers the wider field.

When is neither the right tool?

When the app depends on deep native features: custom camera processing, background location, Bluetooth hardware, complex offline sync. Both builders can attempt these, but you will spend most of your time debugging generated code you did not write.

When a development team will own the code from day one. Then a coding agent such as Claude Code or Cursor, working inside a normal repository with tests and reviews, gives more control than any hosted builder.

And when the product is really a website. If you are not even sure you need a computer to start, see can you build an app on your phone. Not every idea needs an app, and a fast web app is cheaper to build, update and distribute.

What to choose

Choose Rork when the product is phone-first and you want native iPhone and Android apps with a guided path to TestFlight and the App Store. Choose Bolt when the product is web-first and you want one JavaScript codebase that also ships to iOS and Android through Expo. Treat older articles describing Rork as a React Native builder as outdated. Whichever you pick, start from a finished design rather than a blank prompt: a free VP0 design link gives either builder the visual target that separates a polished app from a generic one.

Frequently asked questions

Rork vs Bolt: which is better for building a mobile app? For a phone-first app headed to the App Store, Rork is the more specialised tool: it now writes native Swift for iPhone and Kotlin for Android, runs a cloud simulator and submits to TestFlight. Bolt is stronger when the project is mainly a web app with a mobile version, since its mobile path runs through Expo. Either one builds a better-looking app when you hand it a free VP0 design link as the visual target.

Does Rork still use React Native and Expo? Not for new projects. Rork documents that it used to build Expo apps and switched to native Swift for iPhone after internal benchmarks showed its agent writes better Swift; Android apps are written in Kotlin and web apps in React with Vite. Existing Expo projects keep working. Older comparisons that describe Rork as a React Native builder are out of date.

Can Bolt publish an app to the App Store? Yes, through its Expo integration. Bolt generates an Expo project when you ask for a mobile app in the first prompt, lets you preview it on a phone with Expo Go, and documents building and submitting to TestFlight, the App Store and Google Play through Expo Application Services. You still need your own Apple developer account and must pass App Review.

Which one is cheaper? Both have free tiers with limits and paid plans that meter AI usage, and the real cost depends on how many iterations your app needs. Rork documents a free plan for designing, with building and publishing on paid plans. Bolt meters usage in tokens. Compare on a small real project for a week rather than on the pricing page, because rework is what drives the bill.

When should you use neither Rork nor Bolt? When the app needs heavy custom native work such as advanced camera pipelines, background processing or hardware integrations, or when a team of developers will own the codebase from day one. In those cases a coding agent like Claude Code or Cursor inside a normal project gives more control. Rork and Bolt shine when one person wants a working app quickly.