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Best React Native Open Source Apps

· 5 min read
Beniamin Marcu
Full Stack Developer
Last updated on May 6, 2026

Today we are going to discuss React Native open source apps and production-grade codebases that are useful to study before starting your next mobile app.

In today’s world of programming, reusing proven patterns is as important as writing new code. Open source apps show you how real teams handle navigation, state, offline data, native modules, testing, CI, and release workflows.

At Instamobile, we help developers and entrepreneurs launch faster with functional React Native templates. Open source apps are a great companion: they teach patterns, tradeoffs, and maintenance realities.

Quick Answer​

Good React Native open source apps to study include:

Before copying patterns, always check the repository status, license, latest commits, supported platforms, and setup requirements.

How To Study Open Source React Native Apps​

Do not start by reading every file.

Use this process:

  1. Read the README and setup guide.
  2. Identify app entry points.
  3. Find navigation and routing.
  4. Find state management.
  5. Find API or backend services.
  6. Find offline and caching logic.
  7. Find native modules and platform-specific code.
  8. Check tests and CI.
  9. Run the app only after you understand the prerequisites.

If you are learning from an Instamobile app, pair this with Getting Started with React Native and the app docs.

1. Bluesky Social App​

Bluesky's social app is one of the most useful modern React Native codebases to study. It is a cross-platform client for the AT Protocol social network and uses React Native and Expo across mobile and web.

Study it for:

  • Social feed architecture.
  • Cross-platform product decisions.
  • Moderation and account flows.
  • Real-world navigation and data organization.
  • Expo usage in a production-scale app.

2. Mattermost Mobile​

Mattermost Mobile is a mature open source React Native app for team communication. The project includes native iOS and Android code, TypeScript, testing infrastructure, release notes, and platform-specific requirements.

Study it for:

  • Enterprise messaging flows.
  • Push notification constraints.
  • Native build setup.
  • CI and testing.
  • Handling platform requirements over time.

3. Rocket.Chat React Native​

Rocket.Chat React Native is another strong open source chat app to study. The developer docs explain setup, dependency installation, iOS pod installation, and the fact that the project expects a React Native native environment.

Study it for:

  • Chat room navigation.
  • Workspace and server selection.
  • Message rendering.
  • Authentication flows.
  • Enterprise app structure.

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4. Expensify App​

Expensify App is useful when you want to study offline-first behavior and large-scale product architecture. The app uses React Native and an offline data layer so UI can react to local state while server updates arrive asynchronously.

Study it for:

  • Offline-first product patterns.
  • Separation between UI and actions.
  • Large app organization.
  • Cross-platform product behavior.
  • Real-world contribution workflow.

5. Instamobile React Native Starter Kit​

The Instamobile React Native Starter Kit is smaller than the large production apps above, which makes it easier for beginners to understand.

Study it for:

  • Firebase Auth.
  • Login and onboarding flows.
  • Starter app structure.
  • Theme customization.
  • A practical first app baseline.

For a broader comparison of free, premium, and production-ready starters, read The Ultimate Guide to React Native App Templates.

What About Libraries?​

React Native libraries are useful, but they are not the same as open source apps.

Libraries such as React Native Paper, React Native Elements, React Native Web, Reactotron, Ignite, Gifted Chat, and React Native Calendars are still worth studying, but they teach reusable package design more than end-to-end product architecture.

For UI libraries, read Best React Native UI Libraries. For UI kit inspiration, read Best Free React Native UI Kits.

What To Avoid​

  • Copying old setup commands without checking the README.
  • Treating star count as proof of maintenance.
  • Copying native patches without understanding why they exist.
  • Mixing patterns from multiple large apps too early.
  • Ignoring licenses.
  • Assuming an archived showcase app is a good production baseline.

FAQ​

Should beginners study large open source apps?​

Yes, but only with a narrow goal. For example, study how a project handles navigation or offline state. Do not try to understand the entire codebase in one sitting.

Are open source apps better than templates for learning?​

They solve different problems. Open source apps show real-world complexity. Templates give you a cleaner starting point for your own project. The fastest learning path uses both.

Can I copy code from open source apps?​

Only if the license allows it and you understand the code. In most cases, it is better to copy the idea or architecture pattern, then implement it in your own style.

Bottom Line​

The best React Native open source apps are not just lists of components. They are production systems that show how mobile teams handle product complexity. Study them for patterns, then build smaller features in your own app.

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