Dev tools · alternatives · 2026

24 alternatives to JavaScript Transducers with Underscore API

:raising_hand: Transducers Inspired by Underscore. Contribute to kevinbeaty/underarm development by creating an account on GitHub.

Underarm is a JavaScript library that implements transducers using an Underscore-inspired API. It provides functional programming tools for data transformation and composition. The library is designed for developers… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. JavaScript Transducers with Underscore API launched in 2014; newer entries below may have overtaken it.

1. 1UJ
   Underscore.js for Objective-C▲120

   2012 · underscorem.org · its alternatives →

2. 2
   A command-line utility-belt for hacking JSON and Javascript▲68

   Command-line utility-belt for hacking JSON and Javascript. - GitHub - ddopson/underscore-cli at hn

   2012 · github.com · its alternatives →

3. 3
   Handwritten.js – Convert typed text to realistic handwriting▲255

   Convert typed text to realistic handwriting! Contribute to alias-rahil/handwritten.js development by creating an account on GitHub.

   2020 · github.com · its alternatives →

4. 4AI
   An Isomorphic JavaScript Framework Faster Than React▲337

   2015 · jsblocks.com · its alternatives →

5. 5
   Stitches▲135

   The modern CSS-in-JS library with near-zero runtime.

   2020 · stitches.dev · its alternatives →

6. 6HA
   Handel – A procedural programming language for writing songs in browser▲187

   2021 · handel-pl.github.io · its alternatives →

7. 7AL
   A library to record and intercept JavaScript at runtime▲118

   2017 · maierfelix.github.io · its alternatives →

8. 8AD
   A DOM text-selection highlight renderer▲93

   A simple and fast zero-dependencies-library to transform text-selections into serializable markings.

   2015 · bowlingx.github.io · its alternatives →

9. 9MM
   MeScript, music programming language inspired by Lisp▲25

   Sep 2026 · quadracollision.com · its alternatives →

10. 10UJ
    Underline.js is like underscore.js but using modern ES7 syntax▲8

    2016 · ankurp.github.io · its alternatives →

11. 11
    Weird JSON superset with BigInt, Infinity, TypedArray etc▲67

    the JS/Node.JS library for encoding complex and unconventional data structures. Support for BigInts, TypedArrays, null, undefined, and Symbol. Multiple flavors available. - DO-SAY-GO/WeirdJSON

    2020 · github.com · its alternatives →

12. 12TJ
    Teoria.js - Music theory for JavaScript▲77

    2013 · saebekassebil.github.com · its alternatives →

13. 13
    Duktape-eval – a eval library built on Duktape and WebAssembly▲41

    A safe eval library based on WebAssembly and Duktape/QuickJS. - maple3142/wasm-jseval

    2020 · github.com · its alternatives →

14. 14EA
    Expounder – A small JavaScript library for more engaging tutorials▲134

    2016 · skorokithakis.github.io · its alternatives →

15. 15KJ
    Kerning.js — Take control of your web typography▲154

    2011 · endtwist.github.com · its alternatives →

16. 16TM
    Typograms, Markdown-like renderer for ASCII diagrams▲140

    2022 · code.sgo.to · its alternatives →

17. 17
    Swap.js – a JavaScript micro-framework (HTML fragments over the wire)▲127

    Hi HN! I created this lib in the need of a simple and tiny framework to easily do AJAX-style navigation / replacement of fragments in the page, in a web application. For people who don't want to use client-side-rendering and complex frameworks à la React, there are nowadays a few "HTML-over-the-wire" libraries, like HTMX, Unpoly or this super-tiny one Swap.js :) One other key thing is that no external tool is needed: no bundler, no webpack, no TypeScript compiler, no minification needed. Just write HTML, JS (+ your preferred server-side language: PHP, Python, etc.) and it works. The…

    2023 · github.com · its alternatives →

18. 18
    Arrow JavaScript, Reactivity Without the Framework▲32

    A tiny ~2kb library for building reactive interfaces in native JavaScript

    2025 · arrow-js.com · its alternatives →

19. 19
    Dak – a Lisp-like language that transpiles to JavaScript▲94

    Hi HN, author here. Happy to answer any questions. I had an itch to make a lisp like language that was a thin layer on top JavaScript. Something that could leverage the thriving ecosystem that exists around JavaScript. It's brittle, hot off the oven. Besides being a fan of parenthesis, I think macros fill in a gap that the JavaScript ecosystem today fills in with one-off compilers, bundler plugins and such. Macros can't do everything, but for example I think they have the potential to enable things like JSX, Solid and Svelte style libraries. Take the tour to get a feel for what it can do and…

    2023 · daklang.com · its alternatives →

20. 20
    Open-source real-time transcription playground (React, Python, GCP)▲76

    A real-time transcription project using React and socketio - GitHub - saharmor/realtime-transcription-playground: A real-time transcription project using React and socketio

    2021 · github.com · its alternatives →

21. 21
    Danfo.js▲109

    Open Source JavaScript library for manipulating data.

    2020 · github.com · its alternatives →

22. 22
    MeSpeak.js 2.0 – Text-to-Speech in JavaScript▲84

    (Now Go Bang!) Announcing meSpeak.js 2.0: TTS in JS, now even better.

    2019 · masswerk.at · its alternatives →

23. 23
    SlothTools▲69

    Quickly modify text and JSON using Javascript + LoDash

    2022 · sloth.sellersew.com · its alternatives →

24. 24
    SlothTools Data Manipulation Editor▲70

    Code based data manipulation tool for text, arrays, and JSON

    2023 · sloth.sellersew.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 →