Dev tools · alternatives · 2026

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   CLJS Fiddle – ClojureScript▲82

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

   2016 · cljsfiddle.com · its alternatives →

2. 2MT
   My Turbo Pascal compiler in JavaScript▲101

   2013 · teamten.com · its alternatives →

3. 3
   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 →

4. 4
   Fast.js – faster reimplementations of native JavaScript functions▲323

   Faster user-land reimplementations for several common builtin native JavaScript functions. - codemix/fast.js

   2014 · github.com · its alternatives →

5. 5AI
   An Isomorphic JavaScript Framework Faster Than React▲337

   2015 · jsblocks.com · its alternatives →

6. 6
   A JavaScript interpreter written in Ruby▲75

   A Javascript implementation in Ruby! Contribute to haileys/twostroke development by creating an account on GitHub.

   2012 · github.com · its alternatives →

7. 7
   Very low footprint JSON parser in portable ANSI C▲111

   Very low footprint DOM-style JSON parser written in portable ANSI C - json-parser/json-parser

   2012 · github.com · its alternatives →

8. 8
   Jqview, a simple native GUI for inspecting JSON with jq▲208

   simplest possible native GUI for inspecting JSON objects with jq - fiatjaf/jqview

   2020 · github.com · its alternatives →

9. 9
   Nice-looking Python bindings to V8▲166

   Write Python APIs, then call them from JavaScript using the V8 engine. - tbodt/v8py

   2017 · github.com · its alternatives →

10. 10TF
    Transcrypt – Fast, small Python 3.5 to JavaScript transpiler▲121

    The Transcrypt Python to JavaScript compiler makes it possible to program lean and fast browser applications in Python. Transcrypt applications can use any JavaScript library and can also run on top of Node.js or be used in combination with Django.

    2016 · transcrypt.org · its alternatives →

11. 11AC
    A complete Bash parser in JavaScript transpiled from Go▲89

    2018 · npmjs.com · its alternatives →

12. 12AP
    A playground for in-browser interpreters▲79

    2015 · fatiherikli.github.io · its alternatives →

13. 13AL
    A library to record and intercept JavaScript at runtime▲118

    2017 · maierfelix.github.io · its alternatives →

14. 14
    Leporello.js – interactive functional programming IDE for JavaScript▲107

    Hi! Leporello.js is an interactive functional programming environment designed for pure functional subset of JavaScript. It executes code instantly as you type and displays results next to it. Leporello.js also features an omnipresent debugger. Just position your cursor on any line or select any expression, and immediately see its value. Leporello.js visualizes a dynamic call tree of your program. Thanks to the data immutability in functional programming, it allows you to navigate the call tree both forward and backward, offering a time-travel-like experience. Leporello.js offers the ability…

    2023 · leporello.tech · its alternatives →

15. 15
    Umbrella JS, a 2.5kb jQuery alternative▲132

    :umbrella: Lightweight javascript library for DOM manipulation and events

    2018 · umbrellajs.com · its alternatives →

16. 16
    Classes for javascript that you'd actually use▲52

    Classes for javascript that don't suck. Contribute to jneen/pjs development by creating an account on GitHub.

    2012 · github.com · its alternatives →

17. 17
    An experimental Python to C#/Go/Ruby/JS transpiler▲14

    a restricted python to javascript / c# / go / ruby compiler - pseudo-lang/pseudo-python

    2016 · github.com · its alternatives →

18. 18
    Faster.js – a micro-optimizing JavaScript compiler▲89

    faster.js is a Babel plugin that compiles idiomatic Javascript to faster, micro-optimized Javascript. - vzhou842/faster.js

    2018 · github.com · its alternatives →

19. 19
    A Python native engine for web development▲24

    A Pythonic wraparound of HTML/CSS/JS. Contribute to BrainStormYourWayIn/sierra development by creating an account on GitHub.

    2021 · github.com · its alternatives →

20. 20
    JavaScript port of Scientist library for refactoring critical paths▲34

    :microscope: A JavaScript interpretation of the Ruby library Scientist, a library for carefully refactoring critical paths. - bugthesystem/scientist.js

    2016 · github.com · its alternatives →

21. 21
    a Lisp that uses JSON instead of S-expressions (in .js)▲69

    a lisp implemented in Javascript (not very useful!) - jes5199/brid.js

    2011 · github.com · its alternatives →

22. 22
    Mys – an attempt to create a statically typed Python-like language▲50

    The Mys programming language - an attempt to create a statically typed Python-like language that produces fast binaries. See https://mys-lang.org for more information. - mys-lang/mys

    2020 · github.com · its alternatives →

23. 23OA
    OxJS - a JavaScript Library for Web Applications▲44

    2012 · oxjs.org · its alternatives →

24. 24
    Proof-of-concept Node.JS-like interface with iOS 7 JavaScriptCore▲30

    Node.js Interpreter for iOS 7. Contribute to node-app/Interpreter development by creating an account on GitHub.

    2013 · github.com · 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 →