Commerce · alternatives · 2026

TeaVM enables Java developers to compile Java code into JavaScript that runs directly in web browsers. The tool was created for developers seeking to write browser-based applications using Java instead of JavaScript.… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Java Returns to the Browser with TeaVM launched in 2019; newer entries below may have overtaken it.

1. 1
   Awk-JVM – A toy JVM in Awk▲180

   a toy jvm in awk. Contribute to rethab/awk-jvm development by creating an account on GitHub.

   2020 · github.com · its alternatives →

2. 2
   I finished v5 of a JVM framework I've spent spent half a decade making▲377

   ForewordJavalin is a Java and Kotlin web framework which focuses on simplicity and Java/Kotlin interoperability.It supports WebSockets and HTTP3, and it uses...

   2022 · javalin.io · its alternatives →

3. 3
   MetaVM Creator for Web▲90

   Tool for rapid development of static UI using React.js

   2023 · its alternatives →

4. 4
   JavaFiddle – Compile, run and share Java code fully client side▲66

   2023 · javafiddle.leaningtech.com · its alternatives →

5. 5
   Swimm▲513

   A code documentation tool built for devs

   2023 · swimm.io · its alternatives →

6. 6
   I made a CLI tool to create web extensions with no build configuration▲381

   Hello HN! I'm the creator and solo developer of Extension.js, a development tool for browser extensions with built-in support for TypeScript, WebAssembly, React, and modern JavaScript. Developers use it to spend less time configuring the compilation config or learning new frameworks and more time actually writing code. Most projects similar to Extension.js rely on some sort of abstraction or configuration to get started, making the initial development process slow given the extra learning curve and setup guidelines. By using Extension.js, adding the package to your npm scripts is all it…

   2024 · github.com · its alternatives →

7. 7
   I spent my vacation writing a modern JVM assembler▲218

   A JVM assembler for the modern age. Contribute to roscopeco/jasm development by creating an account on GitHub.

   2022 · github.com · its alternatives →

8. 8VM
   Virtual Machines in the Browser▲281

   2013 · blog.grunseid.com · its alternatives →

9. 93L
   300k lines of Java UI code running native in browser at desktop speed▲289

   2019 · reportmill.com · its alternatives →

10. 10
    Repl.it▲399

    Code and deploy apps in any language right from your browser

    2018 · replit.com · its alternatives →

11. 11WJ
    Wiv.js – A library for a more wiggly div▲265

    2018 · jjkaufman.github.io · its alternatives →

12. 12
    I wrote an open-source browser alternative for Computer Use for any LLM▲180

    Hey HN, I made Browser-Use, an open-source tool that lets (all Langchain supported) LLMs execute tasks directly in the browser just with function calling. It allows you to build agents that interact with web elements using natural language prompts. We created a layer that simplifies website interaction for LLMs by extracting xPaths and interactive elements like buttons and input fields (and other fancy things). This enables you to design custom web automation and scraping functions without manual inspection through DevTools. Hasn't this been done a lot of times? Good question, as a general…

    2024 · github.com · its alternatives →

13. 13
    Tabstack Dev Tools▲319

    Ditch your scraper. Make one API call with any tool.

    Jun 2026 · tabstack.ai · its alternatives →

14. 14
    Rust GUI Library via Flutter▲301

    Hi, I made a bridge (https://github.com/fzyzcjy/flutter_rust_bridge v2.0.0) between Flutter and Rust, which auto translates syntaxes like arbitrary types, &mut, async, traits, results, closure (callback), lifetimes, etc. The goal is to make a bridge between the two, seamlessly as if working in one single language. Then, as an example, I showed how to write Rust applications with GUI by utilizing Flutter. That is discussed in the link in details. To play with it, please visit the GitHub repo, or refer to the end of the article for detailed folders and commands. When I…

    2024 · cjycode.com · its alternatives →

15. 15
    Tail Recursion Optimization for the JVM▲107

    Optimizer library for tail recursive calls in Java bytecode - Sipkab/jvm-tail-recursion

    2020 · github.com · its alternatives →

16. 16
    Execute JavaScript in a WebAssembly QuickJS sandbox▲206

    This TypeScript package allows you to safely execute JavaScript code within a WebAssembly sandbox using the QuickJS engine. Perfect for isolating and running untrusted code securely, it leverages the lightweight and fast QuickJS engine compiled to WebAssembly, providing a robust environment for code execution. Features - *Security*: Run untrusted JavaScript code in a safe, isolated environment. - *File System*: Can mount a virtual file system - *Custom Node Modules*: Custom node modules are mountable - *Fetch Client*: Can provide a fetch client to make http(s) calls - *Test-Runner*: Includes…

    2024 · github.com · its alternatives →

17. 17IW
    I wrote a .NET to JS compiler. Here's an XNA demo compiled to JS.▲103

    2011 · hildr.luminance.org · its alternatives →

18. 18
    CLJS Fiddle – ClojureScript▲82

    A private, browser-only ClojureScript playground powered by the self-hosted compiler.

    2016 · cljsfiddle.com · its alternatives →

19. 19
    JavaFactory – IntelliJ plugin to generate Java code▲44

    Hi HN, I built a code generator plugin for IntelliJ that uses LLMs to create repetitive Java code like implementations, tests, and fixtures — based on custom natural-language patterns and annotation-based references. Most tools like Copilot or Cursor aim to be general, but fail to produce code that actually fits a project structure or passes tests. So I made something more explicit: define patterns + reference scope, and generate code consistently. In this demo, 400 lines of Java were generated in 20 seconds — and all tests passed: https://www.youtube.com/watch?v=ReBCXKOpW3M…

    2025 · github.com · its alternatives →

20. 20UJ
    Unmodified Java Swing apps in any browser, fully client side▲29

    Leaning Technologies - We bring applications to the Web.

    2017 · cheerpjdemos.leaningtech.com · its alternatives →

21. 21QA
    Q8, an In-Browser VM for Learning and Visualizing Bytecode Programming▲145

    2017 · anchovieshat.github.io · its alternatives →

22. 22LT
    Lightweight Threads, Channels and Actors for the JVM▲116

    2013 · blog.paralleluniverse.co · its alternatives →

23. 23
    QuickBEAM – run JavaScript as supervised Erlang/OTP processes▲113

    QuickBEAM is a JavaScript runtime embedded inside the Erlang/OTP VM. If you’re building a full-stack app, JavaScript tends to leak in anyway — frontend, SSR, or third-party code. QuickBEAM runs that JavaScript inside OTP supervision trees. Each runtime is a process with a `Beam` global that can: - call Elixir code - send/receive messages - spawn and monitor processes - inspect runtime/system state It also provides browser-style APIs backed by OTP/native primitives (fetch, WebSocket, Worker, BroadcastChannel, localStorage, native DOM, etc.). This makes it usable for: - SSR…

    Mar 2026 · github.com · its alternatives →

24. 24
    Kyushu – A self-hostable WASM sandbox for JavaScript workers▲89

    A self-hostable Wasm sandbox for JavaScript workers.

    Jun 2026 · kyushu.dev · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →