When comparing Codename One vs Quasar Framework, the Slant community recommends Quasar Framework for most people. In the question“What are the best tools for making a cross-platform application?” Quasar Framework is ranked 4th while Codename One is ranked 17th. The most important reason people chose Quasar Framework is:
Vue 3.x available as a plugin.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro High performance
Pro Open source
Pro Highly customizable
By utilizing lightweight component architecture and the built in graphical designer and theming options you are able to customize a good looking app on any platform.
Pro Java 8 support
Pro Works with all IDEs
Works with NetBeans, Eclipse, IntelliJ, etc.
Pro Multi-platform development environments (via build server)
You can even use Linux desktops to build native iOS apps, no need for a Mac.
Pro Vibrant & helpful community
Pro Attractive pricing
It is possible to build production grade apps even with the free version. Pricing is decent when compared to competitors like Xamarin.

Pro Uses Vue.js 2.0
Vue 3.x available as a plugin.
Pro Good documentation and coding samples
Pro Massive suite of well test & optimized widgets
Instant rebuild for SPA, PWA, Cordova or Electron with Material/iOS Themes.
Pro Designed from the outset for desktop & mobile
Pro Can build/test your PWA with/without PWA wrapper
Pro Supports server side rendering (SSR) like Nuxt + SSR/PWA
"Icon genie" builds app icons and splash images for platforms selected.
Pro Ability to add custom server side code when using SSR
Cons
Con Developed by a single person
Statistically, apps being developed by a single person can be gone without warning.
