Codex AlternativesOnly apps categorised as AI Coding Assistants

The best AI Coding Assistant alternative to Codex is opencode, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Codex and loads of them are AI Coding Assistants so hopefully you can find a suitable replacement. Other interesting AI Coding Assistant alternatives to Codex are Google Antigravity, Claude Code, Cursor and Void.

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Codex alternatives are mainly AI Coding Assistants, but if you're looking for Code Editors or IDEs you can filter on that. Other popular filters include Open Source. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Codex.
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Alternatives list

  1. opencode icon

    opencode

     55 likes

    Terminal-based AI coding assistant featuring a themed native UI, automatic LSP integration, multi-agent sessions, 75+ supported LLMs, local and cloud model options, shareable debugging links, open source licensing, and session sharing for collaborative coding workflows.

    112 opencode alternatives

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • US flagUnited States
    opencode screenshot 1
    Good alternative?
     
  2. Google Antigravity icon

    Google Antigravity

     57 likes

    Google Antigravity is an agentic IDE and coding environment designed to support real world software projects through autonomous development workflows. It provides an agent first workspace where developers set direction while AI agents carry out tasks such as coding, debugging...

    81 Google Antigravity alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Visual Studio Code
    • Xcode
    • Microsoft Visual Studio
    • Zed
    • JetBrains IDE
    • US flagUnited States
    Google Antigravity screenshot 1
    Good alternative?
     
  4. Claude Code icon

    Claude Code

     68 likes

    Terminal AI assistant features deep codebase awareness, rapid code searches, multi-file edits, and advanced code understanding with explicit approval for changes, integration with VS Code and JetBrains, leverages build tools and test suites, and is highly configurable.

    152 Claude Code alternatives

    Cost / License

    • Paid
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Visual Studio Code
    • Homebrew
    • npm
    • JetBrains IDE
    • Online
    • US flagUnited States
    Claude Code screenshot 1
    Good alternative?
     
  5. Ad
    Screenshot
    Dify - LLMOps Platform icon
    Dify - LLMOps Platform

    Streamlines AI application development by combining plugin and dataset integration, a unified API, visual orchestration, analytics, annotation tools, prompt engineering support, backend-as-a-service capabilities, and compatibilit...

    https://dify.ai
    Learn More
  6. Cursor icon

    Cursor

     59 likes

    The AI-first Code Editor. Build software faster in an editor designed for pair-programming with AI.

    169 Cursor alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • iPhone
    • iPad
    • US flagUnited States
    Cursor screenshot 1
    Good alternative?
     
  7. Void icon

    Void

     36 likes

    The open source AI code editor. Write code with the best AI tools, use any model, and retain full control over your data.

    97 Void alternatives

    Cost / License

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • Global
    Void screenshot 1
    Good alternative?
     
  9. Devin Desktop icon

    Devin Desktop

     38 likes

    Windsurf Editor is an IDE merging AI and developers for lockstep collaboration with Cascade capabilities, boosting speed and contextual coding through copilot and agent-like systems across Mac, Windows, and Linux.

    116 Devin Desktop alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • US flagUnited States
    Devin Desktop screenshot 1
    Good alternative?
     
  10. Mellum icon

    Mellum

     27 likes

    Mellum-4b-base is JetBrains' first open-source large language model (LLM) optimized for code-related tasks.

    Cost / License

    Application type

    Platforms

    • Self-Hosted
    • Python
    • CZ flagCzechia
    • European Union flagEU
    Mellum screenshot 1
    Good alternative?
     
  11. GitHub Copilot icon

    GitHub Copilot

     39 likes

    GitHub Copilot leverages the power of OpenAI Codex to provide real-time suggestions for code and complete functions, all within your editor. With its training on vast amounts of code, GitHub Copilot translates natural language prompts into coding suggestions across multiple...

    154 GitHub Copilot alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Visual Studio Code
    • Neovim
    • Microsoft Visual Studio
    • US flagUnited States
    GitHub Copilot screenshot 1
    Good alternative?
     
  12. Emdash icon

    Emdash

     15 likes

    Emdash is a provider-agnostic desktop app that lets you run multiple coding agents in parallel, each isolated in its own git worktree, either locally or over SSH on a remote machine. We call it an Agentic Development Environment (ADE).

    Cost / License

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Homebrew
    • US flagUnited States
    Emdash screenshot 1
    Good alternative?
     
  13. Kiro icon

    Kiro

     15 likes

    Kiro is an AI-powered IDE developed by Amazon Web Services to help developers build and ship production-ready software from prompt to deployment. Based on VS Code, it combines intuitive "vibe coding" with structured...

    65 Kiro alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • US flagUnited States
    Kiro screenshot 1
    Good alternative?
     
  14. Firebase Studio icon

    Firebase Studio

     23 likes

    A cloud-based, agentic development environment designed to accelerate how you build, test, deploy and run production-quality AI applications, all in one place.

    96 Firebase Studio alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Alerts

    • Discontinued

    Platforms

    • Online
    • US flagUnited States
    Firebase Studio screenshot 1
    Good alternative?
     
  15. TabbyML icon

    TabbyML

     20 likes

    Tabby is an open-source, self-hosted AI coding assistant. With Tabby, every team can set up its own LLM-powered code completion server with ease.

    99 TabbyML alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Self-Hosted
    • Visual Studio Code
    • US flagUnited States
    TabbyML screenshot 1
    Good alternative?
     
12 of 74 Codex alternatives