Codename One is an open-source cross-platform Write Once Run Anywhere (WORA) framework to build native apps for iOS, Android, Desktop and Web with Java or Kotlin.

The core appeal is its unrestricted access to the native platform allowing developers to write native code directly from Java or Kotlin and access everything that the native mobile platform can provide. You can generates native OS binaries that you can upload to Apple/Google etc.

To understand how Codename One works, check the introduction or this stackoverflow answer.

Notice that Codename One works with IntelliJ/IDEA, Eclipse, VSCode and NetBeans.

To understand Codename One's history, basics, features etc in detail, check Codename One Developer Guide.
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