Life & fun · alternatives · 2026

24 alternatives to Prolog compiler and interpreter in pure JavaScript

Prolog Interpreter in Javascript

Prolog.js is a Prolog compiler and interpreter built entirely in JavaScript. It allows users to run Prolog code directly in a web browser without additional installations. The tool includes example programs such as… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Prolog compiler and interpreter in pure JavaScript launched in 2015; newer entries below may have overtaken it.

1. 1
   A simple Prolog Interpreter written in a few lines of Python 3▲149

   A simple Prolog Interpreter written in a few lines of Python 3. It runs a limited subset of Prolog and uses backtracking and generators in order to perform its magic. - photonlines/Python-Prolog-Interpreter

   2019 · github.com · its alternatives →

2. 2WA
   Writing an HTTP server in Prolog▲238

   2016 · jamesbvaughan.com · its alternatives →

3. 3
   Embedding a Prolog-like logic programming language in JavasScript▲7

   Embedding a Prolog-like logic programming language in JavasScript and TypeScript. - xieyuheng/logic-db

   2021 · github.com · its alternatives →

4. 4
   Embeddable Prolog in Go▲14

   The only reasonable scripting engine for Go. Contribute to ichiban/prolog development by creating an account on GitHub.

   2021 · github.com · its alternatives →

5. 5
   instantsearch.js by Algolia▲332

   JavaScript UI library for building great search experiences

   2015 · community.algolia.com · its alternatives →

6. 6
   An encoding of the UK's self-isolation rules in Prolog▲108

   An encoding of the UK's self-isolation rules in Prolog - jamespwilliams/prolog-isolation-checker

   2021 · github.com · its alternatives →

7. 7
   A CSS Keylogger▲576

   Chrome extension and Express server that exploits keylogging abilities of CSS. - maxchehab/CSS-Keylogging

   2018 · github.com · its alternatives →

8. 8AI
   An Isomorphic JavaScript Framework Faster Than React▲337

   2015 · jsblocks.com · its alternatives →

9. 9
   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 →

10. 10MT
    My Turbo Pascal compiler in JavaScript▲101

    2013 · teamten.com · its alternatives →

11. 11
    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 →

12. 12JP
    JavaScript Program Synthesis▲139

    2021 · grgv.xyz · its alternatives →

13. 13
    LambdaLisp – A Lisp interpreter that runs on lambda calculus▲189

    A Lisp interpreter written as an untyped lambda calculus term

    2022 · woodrush.github.io · its alternatives →

14. 14
    Code editor by Flawwwless▲89

    An online Javascript code editor 🤖

    2019 · its alternatives →

15. 15
    How to write a tiny compiler▲224

    Write your own compiler: introduction. Code genetation. AST. Abstract syntax tree. lisp. javascript.

    2017 · blog.klipse.tech · its alternatives →

16. 16AJ
    Algebra.js – Build, display, and solve algebraic equations▲132

    2015 · algebra.js.org · its alternatives →

17. 17
    Joy – a Go to JavaScript compiler▲201

    Matt Mueller's personal website for sharing what I've learned about programming, design, entrepreneurship and life.

    2017 · mat.tm · its alternatives →

18. 18ID
    I designed a language for code golf, compiling to Common Lisp▲102

    2013 · rhoscript.com · its alternatives →

19. 19
    A puzzle game inspired by functional programming, written in PureScript▲121

    A puzzle game inspired by functional programming.

    2015 · david-peter.de · its alternatives →

20. 20
    FratmScript▲58

    JavaScript ma comme si deve 🤌

    Jan 2026 · kkratterf.github.io · its alternatives →

21. 21AC
    A complete Bash parser in JavaScript transpiled from Go▲89

    2018 · npmjs.com · its alternatives →

22. 22
    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 →

23. 23
    A Browser-Only Dream Interpreter Using Symbol Logic and JavaScript▲12

    I built a symbolic dream interpretation engine that runs fully in the browser no AI, no backend, no cloud. Just vanilla JavaScript and a hand-mapped keyword system. It scans dream text, matches symbolic keywords to over 300 custom meanings, using deterministic logic. All data stays in localStorage no tracking, no server. Try it here: https://dino-nuggies45.github.io/Dream-Interpreter/ Built to explore subconscious patterns and emotional systems without machine learning. Feedback welcome!

    2025 · github.com · its alternatives →

24. 24
    Small Clojure Interpreter▲143

    Configurable Clojure/Script interpreter suitable for scripting and Clojure DSLs - babashka/sci

    2019 · 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 →