The Six Most Popular Cross-Platform App Development Frameworks

Building an app that works on both iPhone and Android used to mean writing code twice. That took time and money.

Now developers can write code once and ship it to both platforms. These tools are called cross-platform frameworks. They save work and keep projects moving faster.

But which one should you pick? There are many options. At Epic Jam, we help teams make this choice. Here are the six most popular frameworks right now and what you need to know about each.

What Is a Cross-Platform Framework?

A cross-platform framework lets you build apps for multiple systems from one codebase. Instead of writing separate code for iOS and Android, you write it once. The framework handles the rest.

This saves time. It also makes maintenance easier. When you fix a bug, it fixes everywhere.

But not all frameworks work the same way. Some focus on sharing logic only. Others share the whole interface. The right choice depends on your project.

1. Kotlin Multiplatform

Kotlin Multiplatform is built by JetBrains. It takes a flexible approach. You share what you want and write native code when you need it.

Programming language: Kotlin.

Who uses it: Duolingo, McDonald’s, Netflix, Forbes, and Cash App.

How it works: You share business logic across platforms. Things like data handling, networking, and calculations. For the user interface, you can either share it with Compose Multiplatform or build native UIs separately.

Key features:

• Share code across Android, iOS, web, desktop, and servers.
• Works with existing projects. You do not need to rewrite everything.
• Full code-sharing flexibility. Share logic only or share UI too.
• If you already use Kotlin for Android, your team knows the language.
• Google announced official support for Kotlin Multiplatform in 2024. That matters.

What to know: It is newer than some options. But the community is growing fast. Documentation is solid. For teams with Kotlin experience, this feels natural.

2. Flutter

Flutter comes from Google. It is one of the most popular frameworks right now. Developers like how fast it works.

Programming language: Dart.

Who uses it: eBay Motors, Alibaba, Google Pay, and ByteDance.

How it works: Flutter draws everything itself. It does not use native components. Instead, it paints pixels on the screen. This gives you control over how things look.

Key features:

• Hot reload. Change code and see updates instantly. No waiting.
• Many pre-built widgets. You can make apps look however you want.
• Own rendering engine. Apps look consistent across platforms.
• Large community. Many people use Flutter. You can find help easily.

What to know: Dart is not as common as JavaScript or Kotlin. Your team may need to learn it. But the framework itself is mature and stable.

3. React Native

React Native was created by Meta. It has been around since 2015. Many large companies rely on it.

Programming language: JavaScript.

Who uses it: Microsoft Office, Skype, Xbox Game Pass, Facebook, and Instagram.

How it works: It uses React to build interfaces. But instead of web components, it renders real native UI elements. Your app looks and feels native because it uses native parts.

Key features:

• Fast Refresh. See your changes immediately as you work.
• Focus on UI. React primitives map directly to native components.
• Flipper integration. Debug your app with tools like layout inspector and network viewer.
• Huge community. Lots of developers know React. Finding help is easy.

What to know: JavaScript is everywhere. If your team knows web development, they can learn React Native quickly. Performance is good for most apps.

4. Ionic

Ionic takes a different approach. It uses web technologies to build apps. Think HTML, CSS, and JavaScript.

Programming language: JavaScript.

Who uses it: T-Mobile, BBC, and EA Games.

How it works: Ionic wraps web code in a native container. It uses Capacitor or Cordova to access device features like camera and GPS.

Key features:

• UI components designed for mobile. They look like native parts.
• Access to device hardware through plugins.
• Ionic CLI makes building and testing easier.
• Active community forum. People share solutions regularly.

What to know: Ionic apps run in a WebView. This can affect performance for complex apps. But for many business apps, it works well. If your team knows Angular, React, or Vue, Ionic feels familiar.

5. .NET MAUI

.NET MAUI is Microsoft’s framework. It evolved from Xamarin. Forms. You build apps using C# and XAML.

Programming language: C#, XAML.

Who uses it: NBC Sports Next, Escola Agil, Irth Solutions.

How it works: You write code once. It targets Android, iOS, macOS, and Windows from a single project.

Key features:

• Cross-platform APIs for device features like GPS and battery.
• Single project system using multi-targeting.
• Hot reload support. Modify code while the app runs.
• Active communities on Stack Overflow and Microsoft Q&A.

What to know: If your team knows C# and .NET, this is a natural choice. It is newer but gaining traction. Good for teams already in the Microsoft ecosystem.

6. NativeScript

NativeScript has been around since 2014. It lets you build iOS and Android apps with JavaScript or TypeScript.

Programming languages: JavaScript, TypeScript.

Who uses it: Daily Nanny, Strudel, Breethe.

How it works: You write code in JavaScript. NativeScript renders native UI components directly. No WebViews involved.

Key features:

• Direct access to native APIs.
• Platform-native UI rendering.
• Many plugins and pre-built templates.
• Based on familiar web technologies.

What to know: NativeScript is solid but less popular than React Native or Flutter. It is often used by smaller companies and startups. Good if you want native performance with JavaScript.

How to Choose the Right Framework

Picking a framework depends on your situation. Here are the main factors to consider.

Your team’s expertise. What languages do they know? If your team knows JavaScript, React Native or Ionic may fit. If they know Kotlin, look at Kotlin Multiplatform. C# teams should consider .NET MAUI.

Vendor support. Who maintains the framework? Google backs Flutter. Meta backs React Native. JetBrains backs Kotlin Multiplatform. Microsoft backs .NET MAUI. Long-term support matters.

UI needs. How important is the interface? Some frameworks share UI completely. Others share only logic. Kotlin Multiplatform lets you choose. Flutter gives full control over every pixel.

Framework maturity. How stable is it? Check how often things change. Look at GitHub issues. See how bugs are handled. Mature frameworks have fewer surprises.

Capabilities. What tools come with it? Code analyzers? Testing frameworks? Debugging tools? These affect your daily work.

Security. This matters for banking, e-commerce, or anything handling user data. Check how the framework handles storage and authentication. Look at security tickets if available.

Learning resources. Good documentation helps. So do conferences, courses, and community forums. The more resources, the smoother your experience.

At Epic Jam, we look at all these factors. The right framework fits your team, your project, and your users. There is no single best choice.

Final Thoughts

Cross-platform development keeps getting better. You can build great apps faster than ever. The six frameworks here all work. They all have strengths.

Kotlin Multiplatform offers flexibility and native performance. Flutter gives you control and speed. React Native provides a huge ecosystem. Ionic works with web skills. .NET MAUI fits Microsoft shops. NativeScript offers native UI with JavaScript.

Think about what you need. Consider your team. Then pick one and start building.

The tools are ready. The rest is up to you.

Read Also: What is User Experience (UX) Design?

Frequently Asked Questions

Q1) What is the easiest framework for beginners?

React Native is often easiest if you know JavaScript. If you know web development, Ionic may feel familiar. Both have large communities and plenty of tutorials.

Q2) Can I share UI across platforms?

Yes. Flutter and Compose Multiplatform let you share UI. React Native and NativeScript use native components but share logic. It depends on the framework.

Q3) Do cross-platform apps perform as well as native?

For most apps, yes. Performance is close enough that users cannot tell. For games or complex animations, native may still be better.

Q4) Which framework do big companies use?

All of them. Netflix uses Kotlin Multiplatform. Google Pay uses Flutter. Facebook uses React Native. Microsoft uses .NET MAUI. Big companies choose what fits their needs.

Q5) How do I decide?

Start with your team’s skills. Then look at what you need to build. Test a small project. See what feels right. That usually tells you what to pick.