Building the v0 iOS App: A Behind-the-Scenes Look

In late 2025, we launched v0, Vercel’s first mobile app for iOS. As a company primarily focused on web development, creating a native mobile app was uncharted territory. Our goal was to develop an app that could compete for an Apple Design Award, keeping the user experience seamless and familiar.

During development, we experimented extensively with various tech stacks and UI designs before settling on a final version. Inspired by native iPhone apps like Apple Notes and iMessage, we aimed for a natural, intuitive feel. Our challenge was to make v0 feel genuinely native, encouraging users to add it to their Home Screen and treat it as a trusted app.

After months of testing, we chose React Native with Expo, which allowed us to balance performance and ease of development. This combination proved successful, delivering an experience that resonated well with users, sparking many messages from developers curious about our approach. This motivated us to share a detailed technical breakdown of our process.

Our focus was on crafting a smooth chat experience, enabling users to capture ideas quickly and effortlessly, even on the go. Unlike web apps, our goal wasn’t feature parity but providing a simple, delightful AI chat tool optimized for mobile interaction. Key features included animated message entrances, automatic scrolling for new messages, staggered fade-ins for streaming responses, and a floating composer bar with Liquid Glass effect.

We prioritized natural keyboard interactions, support for pasting images, files, and markdown, and dynamic components for rich content. Several UI patterns common on mobile AI chats were missing in existing React Native solutions, so we innovated new patterns through extensive testing and collaboration.

To build a flexible, maintainable chat system, we structured our code into modular, composable plugins, each handling distinct features. Using open source libraries like LegendList, React Native Reanimated, and Keyboard Controller, we created a layered context system. This structure enabled features like animated message entry, asynchronous updates, and optimized scrolling, all managed through custom hooks and providers.

For example, the chat provider wraps message lists, ensuring that each chat session maintains its state independently. The message list itself incorporates plugins for keyboard awareness, dynamic resizing, and seamless scrolling, resulting in a fluid user experience.

In summary, our v0 iOS app was a carefully engineered product that balances native feel with modern React Native development. The result is an intuitive, smooth AI chat app tailored for mobile use, demonstrating that with the right approach, web-centric teams can create compelling native experiences.

Looking ahead, we plan to continue refining the app, adding new features, and exploring further ways to make mobile AI interactions more natural and engaging.

FAQs about Building the v0 iOS App

Q: Why did you choose React Native for the app?
A: React Native offers a good balance between performance and development speed, allowing us to build a native-like experience efficiently across iOS devices.

Q: How did you ensure the app feels native?
A: We adopted design patterns from native iPhone apps, focused on smooth animations, native UI elements, and natural keyboard behavior, all fine-tuned through extensive testing.

Q: What challenges did you face during development?
A: Creating custom UI patterns for AI chat, handling keyboard interactions, and ensuring smooth scrolling were complex tasks that required innovative solutions.

Q: Will the app have feature parity with the web version?
A: Not necessarily; our goal was to create a mobile experience optimized for quick interactions, not to replicate all web features exactly.

Q: What’s next for the v0 iOS app?
A: We plan to add more features, improve existing interactions, and continue to iterate on providing a native, engaging experience for mobile users.