Alternatives

Products that do what ExprTk REPL – Explore math expressions in the browser with WebAssembly does

ExprTk compiled to WebAssembly lets you explore and evaluate math expressions instantly in your browser. Everything runs client-side at near-native speed.

1. 1
   WebAssembly▲86

   New binary format for compiling applications for the web

   2015

2. 2CX
   CheerpX – x86 Node.js/python3/Ruby REPL in browser via WebAssembly JIT▲88

   2021 · repl.leaningtech.com

3. 3AE
   An Easy Programming Language – Built with WebAssembly▲144

   2019 · easyprog.online

4. 4
   repl.it▲109

   Online code repl for pretty much any language.

   2015

5. 5AE
   An Easy Programming Language That Runs in the Browser via WebAssembly▲32

   2021 · easylang.online

6. 6EH
   ExprTk High-Performance C++ Math Expression Parser Evaluation Engine▲8

   Jan 2026 · partow.net

7. 7OH
   Online Haskell REPL▲82

   2017 · repl.it

8. 8
   CoderPad▲77

   In-browser REPL and compiler for programmer interviews.

   2014

9. 9DE
   Duktape-eval – a eval library built on Duktape and WebAssembly▲41

   2020 · github.com

10. 10
    CoderTrick▲71

    Convert your code into your desired format

    2019

11. 11UP
    Using Parsing Expression Grammars to rewrite source code▲63

    2016 · github.com

12. 12AL
    A List of Programming Languages That Currently Compile to WebAssembly▲11

    2017 · github.com

13. 13CA
    Computation at Compile-Time now free online▲57

    2017 · billsix.github.io

14. 14IG
    Interactive Go REPL in Your Browser with WebAssembly▲8

    2018 · gopry.rice.sh

15. 15RJ
    ReplPad – Javascript Repl/Scratchpad▲54

    2021 · replpad.com

16. 16EM
    Eslisp – Minimal JavaScript S-expression syntax and macro system▲51

    2015 · github.com

17. 17WF
    WebAssembly from the Ground Up – learn WASM by building a compiler▲7

    Hi HN! We (pdubroy & marianoguerra) just launched an online book called WebAssembly from the Ground Up. It's an online book to learn Wasm by building a simple compiler in JavaScript. This is the book we wish we'd had 3 years ago. Unlike many WebAssembly resources that focus on use cases and tooling, we wanted a deep dive into how Wasm actually works. We focus on the core of WebAssembly: the module format and the instruction set. We think the low-level details — the "virtual ISA" — are the most interesting part, and we had the crazy idea that writing a compiler is the best way to learn it.…

    2025 · wasmgroundup.com

18. 18WA
    Wasmer – A Go library for executing WebAssembly binaries▲44

    2019 · github.com

19. 19E0
    Expreduce 0.2, a free Mathematica-compatible CAS written in Go▲14

    2017 · github.com

20. 20CH
    Compiles Haskell to WebAssembly▲5

    2018 · github.com

21. 21SM
    Serializable Math Expressions Using Cap'n Proto▲15

    2015 · github.com

22. 22SS
    Sempl – Stupid Simple Bash Templating▲30

    2015 · github.com

23. 23RA
    Runiq, a little Lisp-inspired language that runs on JavaScript▲24

    2015 · github.com

24. 24CT
    C to WebAssembly in JavaScript▲6

    2017 · maierfelix.github.io

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