When comparing Telerik AppBuilder vs Quasar Framework, the Slant community recommends Quasar Framework for most people. In the question“What are the best frameworks for developing cross-platform mobile apps with JavaScript?” Quasar Framework is ranked 3rd while Telerik AppBuilder is ranked 18th. The most important reason people chose Quasar Framework is:
Vue 3.x available as a plugin.
Specs
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Pros
Pro Plugins for popular IDEs
Telerik provides Visual Studio and Sublime Text plugins for the AppBuilder.
Pro Integrates with Apache Cordova
AppBuilder offers a fast way to import Cordova plugins such as the camera.

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 Young project with a small community
AppBuilder is a young project that's been fairly slow to gain popularity. This means the community is rather small, so there is a limited amount of 3rd party learning resources available.
There is a forum, but it's not very active.
Con Developed by a single person
Statistically, apps being developed by a single person can be gone without warning.
