Aider vs Cline

Aider is an open-source command-line tool for AI-assisted software development, described as "AI pair programming in your terminal." It builds a map of an entire codebase for context, supports over 100 programming languages, and lets developers connect their choice of LLM, including Claude 3.7 Sonnet, DeepSeek, OpenAI models, or local models, rather than locking users into one provider. Aider automatically commits changes to git with descriptive messages, can accept images and web pages as visual context, and includes voice-to-code input plus built-in linting and automated testing. It has over 44,000 GitHub stars and more than 6.8 million pip installations, with an active Discord community.

Cline is an open-source AI coding agent that performs coordinated multi-file changes with linter-aware fixes, diffs, checkpoints, and one-click undo on every step. It can also execute terminal commands and handle deployment-related tasks directly within the coding session.

• Fully open source and free to run
• Works with almost any LLM provider, avoiding lock-in
• Automatic git commits keep a clean history of AI changes
• Large, active open-source community

• Open source with no lock-in on which model provider you use
• Multi-file agentic edits with visible diffs and easy one-click undo
• Wide IDE support beyond just VS Code, including JetBrains, Cursor, and Windsurf
• Large, active open-source community and contributor base

• Requires comfort with the terminal/command line
• Users must supply and pay for their own LLM API access
• No official GUI -- IDE integration is comment-based rather than native

• Requires bringing your own API key, adding setup complexity and separate model costs
• Output quality depends heavily on which underlying model you connect
• No single bundled price includes a managed model, unlike some closed competitors