CheerpJ is a Java to JavaScript compiler that allows you to convert your Java applications into JavaScript web apps.
Best GWT (Google Web Toolkit) Alternatives ranked by AI · updated May 2025
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GWT is a development toolkit for building and optimizing complex browser-based applications.
Price: Free
Top 6 GWT (Google Web Toolkit) alternatives
Eclipse Rich Ajax Platform (RAP) is an open-source framework for building modern web applications using the Eclipse development model, Java, and HTML.
3
A platform and framework for building single-page client applications using HTML and TypeScript
Pros
- Two-way data binding for automatic UI updates
- Dependency injection for modular and testable code
Cons
- Complexity of large-scale applications
- Performance overhead for smaller projects
4
Vaadin is a popular web application framework for Java developers, known for its ease of use and rich component library.
Pros
- Easy to learn
- Extensive component library
Cons
- Limited customization options
- Less flexible than other frameworks
Free / Paid
5
JSweet is a transpiler from Java to TypeScript/JavaScript for migrating legacy Java applications to modern web applications.
Pros
- Supports Java 8 features
- Easy integration with JavaScript libraries
Cons
- Limited IDE support
- Less active community
J2CL is a source-to-source compiler that converts Java to Closure code for GWT applications.
Pros
- High performance output
- Seamless integration with Closure Compiler
Cons
- Complex build setup
- Limited documentation
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