Claude Code Alternatives

Free and open-source alternatives to Claude Code

• Aideropen source
• Codex CLIopen source
• Gemini CLIopen source
• Crushfree
• Opencodeopen source
• Qwen Codeopen source
• Spec Kitopen source
• Claude Contextopen source
• Clineopen source
• Desktop Commanderopen source
• Gooseopen source
• Repomixopen source
• Serenaopen source

Claude Code alternatives in detail

1. Aider

   open sourceCLI

   Aider is an open-source (Apache-2.0) command-line tool for AI pair programming. Run it inside a Git repository, describe a change in plain language, and it edits files on disk and commits each step with a descriptive message. Model-agnostic: bring your own API key for Claude, GPT, and others; a repo map gives the model context in large codebases.

   Read: Aider vs Claude Code: Open-Source vs Anthropic's Agent (2026)

   Read: AI Coding Agents in 2026: The Open-Source & CLI Edition

   Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)

2. Codex CLI

   open sourceCLI

   Codex CLI is OpenAI's open-source (Apache-2.0) terminal coding agent: it reads files, edits them on disk, and runs shell commands in an OS-level sandbox with network off by default and, in trusted folders, workspace-scoped writes. Sandbox modes and approval policies control what it can do and when it must ask; sign in with a ChatGPT plan or API key.

   Read: Claude Code vs Codex CLI: Terminal Agents Compared (2026)

   Read: Claude vs GPT vs Gemini for Coding in 2026

   Read: AI Coding Agents in 2026: The Open-Source & CLI Edition

   Read: The Best GitHub Copilot Alternatives in 2026 (Free and Paid)

   Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)

3. Gemini CLI

   open sourceCLI

   Gemini CLI is Google's open-source (Apache-2.0) terminal AI agent for Gemini models, with a 1M-token context window, file and shell tools, Google Search grounding, MCP, and GEMINI.md files. Since June 18, 2026 it no longer serves free or Google AI Pro/Ultra users, who are pointed to Antigravity CLI; paid API keys and enterprise Code Assist still work.

   Read: Claude Code vs Gemini CLI: Which Terminal Agent (2026)

   Read: Claude vs GPT vs Gemini for Coding in 2026

   Read: AI Coding Agents in 2026: The Open-Source & CLI Edition

   Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)

4. Amp

   freemiumAgent

   Amp is an agentic coding tool that spun out of Sourcegraph in December 2025: a CLI plus apps for the web, Mac, iPhone, and iPad that run frontier models to read, edit, and run commands across a repository. Subagents parallelize independent sub-tasks, the Oracle adds a second-opinion reasoning model, and threads can be shared with a workspace.

   Read: The Best GitHub Copilot Alternatives in 2026 (Free and Paid)

   Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)

5. Cursor

   freemiumIDE

   Cursor is an AI-first code editor forked from VS Code, so extensions, themes, and keybindings carry over. It layers on tab completion, inline natural-language edits, an agent mode that reads, writes, and runs commands across files, and parallel agents across repos and worktrees. Freemium: a free Hobby tier, with Pro and Teams raising included usage.

   Read: Claude Code vs Cursor: Which AI Coding Tool in 2026?

   Read: Cursor vs Claude Code vs GitHub Copilot vs Windsurf in 2026

   Read: AI Coding Agents in 2026: The Open-Source & CLI Edition

   Read: The Best GitHub Copilot Alternatives in 2026 (Free and Paid)

   Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)

6. Crush

   freeFSL-1.1-MITmacOS, Windows, Linux, AndroidCLI

   Crush is Charm's free terminal coding agent. It continues opencode-ai/opencode (archived; last push September 2025), not today's OpenCode. It runs nearly any model, including local ones, switches models mid-session and adds LSP context, MCP and Agent Skills. It is source-available under FSL-1.1-MIT, not OSI open source; releases turn MIT after two years.

   Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)

7. Opencode

   open sourceMITmacOS, Windows, LinuxCLI

   OpenCode is the most-starred open-source coding agent (~206k GitHub stars by September 2026) — a terminal TUI from Anomaly (formerly SST) that works with 75+ model providers including local ones, loads language servers for code intelligence, runs parallel sessions, and shares them via links. MIT-licensed; bring your own keys or use the optional Zen gateway.

   Read: Claude Code vs OpenCode: First-Party vs Open Source (2026)

   Read: Aider vs Claude Code: Open-Source vs Anthropic's Agent (2026)

   Read: Cline vs Kilo Code vs Roo Code (2026): Which to Use After Roo's Shutdown

   Read: AI Coding Agents in 2026: The Open-Source & CLI Edition

   Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)

8. Qwen Code

   open sourceApache-2.0macOS, Windows, LinuxCLI

   Qwen Code is the Qwen team's free, Apache-2.0 coding agent, originally forked from Gemini CLI. It speaks OpenAI, Anthropic, Gemini and Qwen APIs, runs local models via Ollama or vLLM, and ships subagents, hooks, MCP and plan mode. The free Qwen OAuth quota ended April 15, 2026, so bring an API key, an Alibaba Cloud plan or a local model.

   Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)

9. Spec Kit

   open sourceMITmacOS, Windows, LinuxCLI

   Spec Kit (GitHub, MIT, ~111k stars since its September 2025 launch) productized spec-driven development: specify init scaffolds a project, then /speckit.constitution, .specify, .plan, .tasks, and .implement walk your coding agent through the pipeline — each phase emitting a markdown artifact that feeds the next. Works with 30+ agents including Claude Code, Copilot, and Cursor.

10. Claude Context

    open sourceMITmacOS, Windows, LinuxMCP

    Claude Context is Zilliz's MIT-licensed MCP server for semantic code search. It indexes your repository into Milvus or Zilliz Cloud using AST-based chunking, then answers natural-language queries with hybrid BM25 and dense-vector search through four tools. It runs locally over stdio and needs Node.js 20+, an embedding provider, and a vector database.

11. Claude Cowork

    paidmacOS, Windows, Linux, Web, iOS, AndroidAssistant

    Claude Cowork is Anthropic's agent for non-coding work: describe an outcome and Claude reads, edits, and creates files in folders you choose, uses connectors and plugins, and runs multi-step tasks to completion. Launched January 12, 2026 as a macOS research preview, it is now on Pro, Max, Team, and Enterprise across desktop, web, mobile, and Chrome.

    Read: Claude Free vs Pro vs Max vs Team (2026): Which Plan Unlocks What

12. Cline

    open sourceExtension

    Cline is an open-source autonomous coding agent that runs as a VS Code extension, with a JetBrains plugin and terminal CLI as well. Describe a goal and it plans, edits files, and runs commands, showing every change as a diff you approve before it executes. Bring your own model: Anthropic, OpenAI, OpenRouter, Google, Bedrock, or local runtimes like Ollama.

    Read: Cline vs Kilo Code vs Roo Code (2026): Which to Use After Roo's Shutdown

    Read: AI Coding Agents in 2026: The Open-Source & CLI Edition

    Read: The Best GitHub Copilot Alternatives in 2026 (Free and Paid)

    Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)

13. Desktop Commander

    open sourceMITmacOS, Windows, LinuxMCP

    Desktop Commander is an MIT-licensed MCP server that gives Claude terminal control, file system search, and diff-based file editing. Built on the MCP Filesystem Server with extra search-and-replace editing, it turns a chat client like Claude Desktop into something closer to a coding agent. It installs through npx and needs Node.js 18 or newer.

14. Devin

    freemiumAgent

    Devin is Cognition's autonomous AI software engineer. You hand it a task — a bug, refactor, or ticket — and it works unattended in a sandboxed cloud VM with an editor, terminal, and browser, then opens a pull request you review. Trigger it from Slack, Teams, or Linear, run sessions in parallel, and pay through usage quotas plus prepaid on-demand credits.

    Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)

15. Factory

    paidAgent

    Factory is an agent-native software development platform. Its autonomous coding agents, called Droids, plan, write, test, and ship code across the terminal (Droid CLI), IDE, and web, pulling in organizational context from GitHub, Jira, Slack, and your codebase. It targets individual developers and enterprise engineering teams.

    Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)

16. Goose

    open sourceAgent

    Goose is an open-source (Apache-2.0), general-purpose AI agent that runs entirely on your machine — it executes shell commands, edits files, runs tests, and chains multi-step tasks. MCP-native with 70+ documented extensions and model-agnostic across 15+ providers including local models, it ships as a Rust CLI and a desktop app for macOS, Linux, and Windows.

    Read: AI Coding Agents in 2026: The Open-Source & CLI Edition

    Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)

17. Jules

    freemiumWebAgent

    Jules is Google Labs' asynchronous coding agent, free for up to 15 tasks a day. You connect a GitHub repo and describe a task; Jules works in a Google-hosted VM, proposes a Gemini-built plan, shows diffs for approval and opens a pull request. It is proprietary and labeled experimental, and its changelog's latest entry is March 9, 2026.

    Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)

18. Kiro

    freemiummacOS, Windows, Linux, WebIDE

    Kiro is AWS's spec-driven coding agent for the IDE, terminal and web, with a free plan. It turns a prompt into requirements, a design and sequenced tasks, then checks the code against them with property-based tests. It is proprietary, and one agent harness carries specs, hooks and MCP servers across the IDE, the kiro-cli agent and Kiro Web.

    Read: The Best GitHub Copilot Alternatives in 2026 (Free and Paid)

    Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)

19. Repomix

    open sourceMITmacOS, Windows, LinuxMCP

    Repomix is an MIT-licensed tool that packs an entire repository, local or on GitHub, into one AI-friendly file. Use it as a CLI, or as an MCP server (repomix --mcp) whose tools pack a codebase and let the agent grep and read the output in slices, with optional Tree-sitter compression and secret detection. It needs Node.js 22+ or Docker.

20. Serena

    open sourceMITmacOS, Windows, LinuxMCP

    Serena (MIT, ~29k stars as of September 2026) is 'the IDE for your agent': an MCP server backed by language servers giving agents symbol-level tools — find symbol, find references, replace symbol body, rename — across 40+ languages. Precise, token-efficient edits at the symbol level instead of regex surgery, plus a project memory for cross-session knowledge.

21. Warp

    freemiumTerminal

    Warp is an AI-powered terminal whose agent can plan, run, and chain commands while you approve what executes. Output is grouped into navigable blocks, workflows share vetted commands, and the agent grounds itself in your indexed codebase. A standalone Warp Agent CLI followed in August 2026. The client is open source (mostly AGPL-3.0), with a free tier.

    Read: The Best Claude Code Alternatives in 2026 (Free, Open-Source, and Paid)