With the arrival of WASM GC, recently announced by Google, then Kotlin Multiplatform + Jetpack Compose has surfaced as a potential option for cross-platform apps. See more here:

youtu.be/RcHER-3gFXI

2 other honorable mentions:

Quasar for Vue.js. "One source code for all platforms simultaneously with all the latest and greatest best practices out of the box."

CodenameOne - "Cross-platform framework for building truly native mobile apps with Java or Kotlin. Write Once Run Anywhere support for iOS, Android, Desktop & Web."

Honorable mention:

Hyperview - Lets you use Server-Driven UI Rendering of a native app, via rendering server-generated XML. Could be used with Rails, Django or any HTTP server on the back-end etc.

"Hyperview is our open-source project to bring the benefits of thin-client, HATEOAS development to native mobile apps. The project consists of two parts:

• Hyperview XML (HXML) is an XML-based format to describe native mobile UIs. It supports common UI elements like headers, scroll views, lists, text field, and much more. It also supports styling and a behavior syntax for describing user interactions (touches, gestures, input interaction) without the need for scripting.

• Hyperview Client is a cross-platform library for rendering HXML in mobile apps. Implemented in React Native, it can be embedded in existing apps, or you can use it to create a new app from scratch."

" hyperview.org/docs/guide_introduction

I'd like to mention a new exciting option (for a crossplatform app) that I recently came across, that AngelRs github.com/angel-rs is working on:

11. Qwik (City) + React Native, using shared qwikified React components. An especially promising alternative for those that care greatly about performance and SSR/SEO on Web.

Quote from AngelRs on 2022-09-23 from the #qwik-help-archive channel on the Builder.io Discord:

Some progress on Qwik + React Native:

Simple demo showcasing shared component & navigation logic drive.google.com/file/d/1Gf2z1Mw_1otVYFi1wz5D-4vH… Shared component between React Native Mobile App (Expo) & a Qwik (Qwik City) web app.

Styles: Qwik: Tailwind RN: Nativewind

Navigation: Qwik: <a> tags RN: <Link> component (abstraction on top of react-navigation)

Pending:

• Animations
• Better configuration (Currently needs vite config setup to patch some dependencies & a metro config for RN)
• Use in real applicatino (dogfooding)
• Monorepo setup
  • web (qwik-city app)
  • native (expo app)
  • design-system (shared)
• Open source

Not a priority right now, but making slow progress towards it. Currently mantaining a simple qwik city app & a react-native app. So really excited to 'merge' the two.

Thanks for this amazing read :-)