Dev tools · alternatives · 2026

24 alternatives to Javascript Compatibility Checker

Paste your Javascript code and instantly check compatibility

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Javascript Compatibility Checker launched in 2017; newer entries below may have overtaken it.

1
JavaScript Quiz▲190
Check your JS knowledge by having fun.
2021 · javascriptquiz.com · its alternatives →
2
CodeCombat▲143
Learn to Code JavaScript by Playing a Game
2014 · codecombat.com · its alternatives →
3
JavaScript.com▲217
A free resource for learning and developing in JavaScript
2015 · javascript.com · its alternatives →
4
is.js▲132
Micro check library for programmers
2015 · is.js.org · its alternatives →
5
A VS Code extension to check incompatible CSS▲21
I've developed a handy tool for Visual Studio Code that makes checking CSS compatibility very easy for developers. It provides instant feedback on syntax, keywords, types, and function compatibility. It even highlights deprecated, non-standard, and experimental features.
2024 · github.com · its alternatives →
6
Modular JavaScript▲67
Let's write robust, well-tested, modular JavaScript code.
2016 · rajabandotind.com · its alternatives →
7
Simplified JavaScript Jargon▲137
Community-driven explanation of JavaScript buzz words
2016 · jargon.js.org · its alternatives →
8
The State Of JavaScript Survey▲103
Discover which JavaScript libraries are the most popular
2016 · stateofjs.com · its alternatives →
9
InAppBrowser.com▲198
Check if an in-app browser is injecting JavaScript code
2022 · inappbrowser.com · its alternatives →
10
Code editor by Flawwwless▲89
An online Javascript code editor 🤖
2019 · its alternatives →
11
A Repo of JavaScript Coding Challenges▲127
Some basic javascript coding challenges and interview questions - kolodny/exercises
2015 · github.com · its alternatives →
12
Quick Preview▲113
Copy/paste and test your HTML code in real-time.
2024 · quickpreview.dev · its alternatives →
13
JavaScript Air - 22: The Science of People in Tech▲65
What you can do to improve your workspace and community
2016 · javascriptair.com · its alternatives →
14
How to ensure JavaScript code quality▲83
DeepScan is a cutting-edge static analysis tool for JavaScript. You can inspect all of your JavaScript code comprehensively.
2017 · deepscan.io · its alternatives →
15
Flow▲74
Static type checker to find errors in JavaScript programs
2014 · its alternatives →
16
An experimental data-flow analysis tool for JavaScript▲95
Find the origin of any character in the DOM
2019 · fromjs.com · its alternatives →
17EC
ES-Checker, a feature detection library for ECMAScript▲37
2015 · ruanyf.github.io · its alternatives →
18
PasteCheck▲2
Paste your code. See your errors. No setup, no signup.
May 2026 · pastecheck.co.uk · its alternatives →
19
I made a tool to check the licenses of your JavaScript dependencies▲5
A simple tool to check all the licenses in your dependencies - franciscop/check-licenses
2020 · github.com · its alternatives →
20
JavaScript Code Analyzer▲2
Paste your JavaScript. See what your code says about you.
May 2026 · tooldocket.com · its alternatives →
21IJ
Is JavaScript Enabled?▲29
2019 · isjsenabled.com · its alternatives →
22
JavaScripting▲5
Ranking of top JavaScript libraries, frameworks, and plugins
2019 · its alternatives →
23
JavaScript quiz▲5
A quiz with some tricky JavaScript questions for developers
2021 · javascript-questions.vercel.app · its alternatives →
24
TypeScript types that conform to JSON schemas without code generation▲17
Let JSON play nicely with Typescript. Contribute to ostrowr/ts-json-validator development by creating an account on GitHub.
2019 · github.com · its alternatives →

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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 →