Aider vs OpenCode
Both are AI code tools. Here’s how they compare on pricing, use case and popularity — so you can pick the right one without opening ten tabs.
Aider
Aider is a free, open-source command-line AI coding tool that connects to your git repo and edits files directly. It works with any AI model (GPT-4o, Claude, etc.) and has strong multi-file editing, test-running and commit support. Popular with developers who prefer terminal workflows.
OpenCode
OpenCode is a fully open-source (MIT-licensed) AI coding agent built by the team behind SST. It connects to 75+ model providers — Claude, GPT, Gemini, DeepSeek, or local models via Ollama — so you control cost and model choice instead of being locked to one vendor. Standout features include LSP-aware diagnostics fed back to the model, background subagents, a research-focused Scout agent, and fully air-gapped deployment for regulated environments. With 160,000+ GitHub stars and 7.5 million monthly developers, it's the most-adopted open-source coding agent built to date.
Pick Aider if you want developers who want a free, open-source, terminal-based ai coding assistant. Pick OpenCode if you want developers who want a free, open-source coding agent that works with any ai model, including local ones. Both have a free way to try them, so the fastest answer is to open each and run your real task.