Pick Aider if you want a mature, git-centric pair programmer that makes surgical edits and commits each one cleanly. Pick OpenCode if you want a broader, more agentic TUI with LSP integration and the widest model-provider support. Both are free, open-source, model-agnostic CLIs — the choice is about workflow style, not price.
Side by side
| Aider | OpenCode | |
|---|---|---|
| Cost | Free (BYOK) | Free (BYOK) |
| License | Apache 2.0 | MIT |
| Interface | Chat-style CLI | Rich TUI |
| Best at | Git-native surgical edits | Agentic, multi-step tasks |
| Providers | Dozens + local (Ollama) | 75+ + local |
| LSP integration | Limited | Yes |
| Auto git commits | Yes, per change | Optional |
| Maturity | Since 2023, 45K+ stars | Newer, fast-moving |
Aider
Aider, created in 2023 by Paul Gauthier, is the elder statesman of open-source coding CLIs — Apache 2.0, past 45,000 GitHub stars, and battle-tested. Its defining traits are the repo map for whole-codebase context and automatic git commits: every AI change lands as its own commit with a descriptive message, so your history stays clean and every edit is trivially reversible.
The style is a focused pair programmer rather than a runaway agent. You direct it, it makes precise edits, runs your linters and tests, and commits. That control and transparency is exactly what many developers want. Read the full Aider review for the deeper look.
OpenCode
OpenCode is the newer, more ambitious tool — MIT-licensed, with a rich terminal UI and support for 75+ model providers plus local models. Its standout is LSP integration, which gives the agent real language-server awareness (types, references, diagnostics) rather than just text, and a more autonomous, agentic loop for multi-step tasks.
It moves fast and does more per instruction, at the cost of being younger and less settled than Aider. If you want an open-source agent that behaves more like Claude Code but with total model freedom, OpenCode is the one. See the full OpenCode review and OpenCode vs Claude Code.
Which should you pick?
Pick Aider if you value a clean git history, surgical control, and a mature, stable tool — it's the best choice for careful, review-friendly AI edits and for anyone who wants their AI changes to read like normal commits.
Pick OpenCode if you want more agentic autonomy, LSP-aware editing, and the broadest provider support, and you don't mind a younger, faster-moving project. Both are free, so trying each on a real task costs only a few tokens. For the wider field, see our best AI coding assistants ranking and Claude Code alternatives.
Frequently Asked Questions
Are Aider and OpenCode both free?
Yes. Both are free, open-source, and model-agnostic — bring your own API key and pay only for tokens, or run local models via Ollama at no cost. Aider is Apache 2.0 and OpenCode is MIT.
What is the main difference between Aider and OpenCode?
Aider is a mature, git-centric pair programmer that auto-commits every change and excels at surgical edits. OpenCode is a newer, more agentic TUI with LSP integration and 75+ providers for broader autonomous coding.
Which is better for beginners?
Aider, thanks to its simple chat-and-commit workflow and mature docs. OpenCode's richer TUI and agentic behavior offer more power but a slightly steeper learning curve.
Which has better git integration?
Aider. Automatic per-change commits with descriptive messages are core to how it works. OpenCode can commit too, but Aider's git-native workflow is its defining strength.
Which supports more models?
OpenCode, with 75+ providers, edges Aider's already-broad support. In practice both cover every major model — Claude, GPT, Gemini, DeepSeek — plus local models via Ollama.
Can I use both?
Yes. Since both are free and model-agnostic, some developers keep Aider for careful git-tracked edits and reach for OpenCode when they want a more autonomous agent on a larger task.