Dev tools · alternatives · 2026

24 alternatives to Judge0 IDE

Free and open-source online code editor.

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Judge0 IDE launched in 2020; newer entries below may have overtaken it.

1. 1
   Ideone▲68

   Compile and execute code online in 80+ programming languages

   2017 · ideone.com · its alternatives →

2. 2AI
   An IDE for poets▲398

   2012 · tranquillpoet.com · its alternatives →

3. 3
   We are building an open-source IDE powered by AI▲369

   Open-source, secure environment with real-world tools for enterprise-grade agents. - e2b-dev/E2B

   2023 · github.com · its alternatives →

4. 4
   Whiteboard (YC W26) – an open-source IDE for thoughtful software design▲423

   open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.

   27d ago · github.com · its alternatives →

5. 5
   CodeRabbit VS Code Extension▲344

   Free AI code reviews directly in the IDE

   2025 · coderabbit.ai · its alternatives →

6. 6
   AI SQL Editor by Supabase▲652

   Write SQL without knowing SQL

   2023 · supabase.com · its alternatives →

7. 7
   49agents IDE▲128

   An infinite 2D canvas where every AI coding agent, terminal, repo and machine you own lives side by side. Open source, self-hostable.

   Sep 2026 · 49agents.com · its alternatives →

8. 8
   Editor.do▲140

   The all-in-one online IDE, visual builder & host

   2024 · editor.do · its alternatives →

9. 9
   Codex​​▲247

   Discuss and understand your code base from within your IDE

   2022 · usecodex.com · its alternatives →

10. 10
    fx (by Vercel)▲224

    Vercel's tiny, open-source coding agent

    Aug 2026 · fx.sh · its alternatives →

11. 11
    AiEditor▲589

    An open source AI-powered rich text editor

    2024 · aieditor.dev · its alternatives →

12. 12
    Futurecoder – A free interactive Python course for coding beginners▲371

    Some highlights: - 100% free and open source (https://github.com/alexmojaki/futurecoder), no ads or paid content. - No account required at any point. You can start instantly. (You can create an account if you want to save your progress online and across devices. Your email is only used for password resets) - 3 integrated debuggers can be started with one click to show what your code is doing in different ways. - Enhanced tracebacks make errors easy to understand. - Useful for anyone: You can have the above without having to look at the course. IDE mode…

    2023 · futurecoder.io · its alternatives →

13. 13
    10 Years to Build a Free SQL Editor▲355

    I have spent large parts of the last 10+ years building an SQL Editor. The tool is targeted at data analysts, a lot of effort has gone into charting, visualizing and excel export. If this sounds useful to you, it's Free, please give it a try and let me know any feedback.

    2024 · timestored.com · its alternatives →

14. 14
    Free Code Editor for Pair Programming with Compilers and Autocomplete▲71

    CodeInterview is an Online Code Interview tool & platform where you can do pair programming online for interviews with our online code editor and compilers.

    2015 · codepad.remoteinterview.io · its alternatives →

15. 15CI
    CodeMatch: IDE autocomplete on overdrive▲102

    2011 · languageinterfaces.com · its alternatives →

16. 16
    Mesh IDE – a code editor that feels like a spreadsheet▲199

    Old version. Visualise data and edit JavaScript code using a spreadsheet interface. - chrispsn/mesh

    2017 · github.com · its alternatives →

17. 17
    myCompiler▲122

    Run your favourite programming languages online

    2019 · mycompiler.io · its alternatives →

18. 18
    CodeOrbital▲115

    Code, preview, share, and host with AI Power

    2025 · codeorbital.vercel.app · its alternatives →

19. 19
    Python IDE▲10

    Online Python Code IDE, Editor, Compiler and Interpreter

    2024 · its alternatives →

20. 20
    CodeX-Editor▲125

    A web code editor with AI & multi-language support

    2025 · x-codex.vercel.app · its alternatives →

21. 21
    Ecode – A minimalist and fast open-source code editor▲233

    Hi HN! I've been working on a code editor and I think that it's mature enough to catch some interest. It's using a custom GPU accelerated GUI written in C++. Currently implements some interesting features: LSP, terminal, auto-completion, linters, formatters, custom keybindings, plugins and more. It's a hobby project but still intends to be an alternative to other popular code editors like Sublime, Kate, Lapce, Lite XL (and takes inspiration from them). The project was born as a playground for the GUI I'm developing (eepp GUI) and is advanced enough to currently be my main code editor, but…

    2023 · github.com · its alternatives →

22. 22IV
    ICEcoder v2.0 – online and offline browser code editor▲40

    Have been building a web IDE & browser based code editor and v2.0 has now launched. Contains a whole load of features beyond just code highlighting such as online & offline use, code completion, type boosting, Emmet, database management, find & replace builder, auto backups, Github syncing and a whole lot more. Oh, and it's free & open source. Any and all feedback welcomed.

    2013 · icecoder.net · its alternatives →

23. 23
    Versal Code▲74

    An IDE for eLearning - create and deliver coding courses

    2018 · its alternatives →

24. 24
    Code editor by Flawwwless▲89

    An online Javascript code editor 🤖

    2019 · 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 →