It is an open source cross-platform app development framework for Java & Kotlin developers. It's a Write Once Run Anywhere (WORA) solution for building truly native apps.
Codename One is a tool in the Frameworks category of a tech stack.
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What are some alternatives to Codename One?
React Native enables you to build world-class application experiences on native platforms using a consistent developer experience based on JavaScript and React. The focus of React Native is on developer efficiency across all the platforms you care about - learn once, write anywhere. Facebook uses React Native in multiple production apps and will continue investing in React Native.
Flutter is a mobile app SDK to help developers and designers build modern mobile apps for iOS and Android.
Free and open source, Ionic offers a library of mobile and desktop-optimized HTML, CSS and JS components for building highly interactive apps. Use with Angular, React, Vue, or plain JavaScript.
Xamarin’s Mono-based products enable .NET developers to use their existing code, libraries and tools (including Visual Studio*), as well as skills in .NET and the C# programming language, to create mobile applications for the industry’s most widely-used mobile devices, including Android-based smartphones and tablets, iPhone, iPad and iPod Touch.
Java, Kotlin, IntelliJ IDEA, Eclipse, NetBeans IDE are some of the popular tools that integrate with Codename One. Here's a list of all 5 tools that integrate with Codename One.