The core advantages of Codename One are:

Write Once Run Anywhere support with no special hardware requirements and 100% code reuse
Compiles Java/Kotlin into native code for iOS, UWP (Universal Windows Platform), Android and even JavaScript/PWA
Open Source and Free with commercial backing/support
Easy to use with 100% portable Drag and Drop GUI builder
Full access to underlying native OS capabilities using the native OS programming language (e.g. Objective-C) without compromising portability
Provides full control over every pixel on the screen
Lets you use native widgets (views) and mix them with Codename One components within the same hierarchy (heavyweight/lightweight mixing)
Supports seamless Continuous Integration out of the box
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