Ionic is quite decent, though can become sluggish once your app grows in complexity (even with lazy loading) if you're not careful. Flutter looks interesting,

Ionic is quite decent, though can become sluggish once your app grows in complexity (even with lazy loading) if you're not careful. Flutter looks interesting, going to check it out. In the end one wants a true "write once, run everywhere" framework, not write the business logic and then write the UI 3+ times for each target platform. Ionic delivers on this front, but am curious to see if Flutter takes it to another level (blazing fast dev/reload cycles and native performance in production sound quite appealing).