Top 12 Open-Source Alternatives to Codex

Codex

Codex is a VS Code extension that allows any engineer to attach comments, questions or any kind of content to specific lines of code.

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Product categories

AI AI Assistant AI Tools Code Autocomplete Code Collaboration Coding Developer Tools IDE Open Source Productivity Software Development Text Editors

Summary

The top open-source alternatives to Codex are VS Code, opencode, and Hermes. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

VS Code Landing Page
1

VS Code

Build and debug modern web and cloud applications, by Microsoft
Pricing:
- Open Source
#Software Development #IDE #Text Editors 1215 social mentions
opencode Landing Page
2

opencode

The AI coding agent, built for the terminal.
Pricing:
- Open Source
#AI #Developer Tools #Coding 67 social mentions
Hermes Landing Page
3

Hermes

Pandora Client for OS X
Pricing:
- Open Source
#Productivity #AI #Developer Tools
Atlas-OS.dev Landing Page
4

Atlas-OS.dev

A Claude Code alternative. Open source (MIT), multi-agent, hook-driven, model-agnostic coding CLI with a built-in PRD-to-release pipeline.
Pricing:
- Open Source
- Free
- Free Trial
#Open Source #Terminal Tools #AI
OpenClaw Landing Page
5

OpenClaw

The AI that actually does things. Your personal assistant on any platform.
Pricing:
- Open Source
#Productivity #AI #Programming Tools 42 social mentions
Brackets Landing Page
6

Brackets

A modern, open source text editor that understands web design
Pricing:
- Open Source
#Software Development #IDE #Text Editors 48 social mentions
Figstack Landing Page
7

Figstack

Your intelligent coding companion
Pricing:
- Open Source
#Productivity #Code Collaboration #AI 2 social mentions
Kodus.io Landing Page
8

Kodus.io

Automated AI code reviews, tailored to your workflow.
Pricing:
- Open Source
- Freemium
- Free Trial
- $9.0 / Monthly
#Open Source #Code Review #Programming 6 social mentions
CodeStream Landing Page
9

CodeStream

CodeStream helps development teams resolve issues faster, and improve code quality by streamlining code reviews inside your IDE
Pricing:
- Open Source
#Software Development #Code Collaboration #Developer Tools 1 user reviews
GitHub Actions Landing Page
10

GitHub Actions

Automate your workflow from idea to production
Pricing:
- Open Source
#DevOps Tools #Code Collaboration #Continuous Integration 330 social mentions
Codeium Landing Page
11

Codeium

Free AI-powered code completion for *everyone*, *everywhere*
Pricing:
- Open Source
#AI #Developer Tools #Coding 46 social mentions
GitHub CLI Landing Page
12

GitHub CLI

Official CLI tool for using GitHub from the command-line.
Pricing:
- Open Source
#Software Development #Git #Code Collaboration 141 social mentions