Codename One Reviews

A few things that stand out to me are a well-documented and pretty extensive API, build server, access to native functionality via native interface, easy extension with third-party libraries, active developer support, and attractive pricing.

Moreover, CodenameOne offers an iOS wizard for generating the required certificates without a MAC.

CodenameOne has opened opportunities for rapid prototyping and affordable product development.

We've found the GUI builder to be the most valuable feature for us.

To the best of my knowledge CN1 is better than some of the available mobile app development frameworks such as Xamarin and Nativescript because it gives almost 100% -- if not 100% -- write once run anywhere. Xamarin doesn't have this feature, you must change few things for some specific platforms. Compared with Nativescript, CN1 is better because of the GUI builder.

Furthermore, CN1 is cost efficient compare with Xamarin and Nativescript. Yes, Nativescript is an open source solution, but to test your app requires to be done either through the telerik platform or with a nativescript CLI simulator. Testing through the telerik platfrom is very easy but not free. Testing through a CLI simulator is free but difficult to setup. 

I'm not saying Xamarin and Nativescript are not good framework for mobile app development, please don't misquote me. THEY ARE VERY GOOD. It depends on the ability and interest of the user. 

All the aforementioned points are based on my own personal experience with the three frameworks (CN1, Xamarin, and Nativescript).

Uses standard Java, with low rewrite requirement for existing applications.

I ported a couple of large-ish real world Java applications, and maintained a common code base. Future development continues, fully cross platform, on standard desktop Java, Android and iOS.