Cline is the most flexible and powerful open-source AI coding agent available. It plans, writes, edits, and runs code across your project autonomously, and connects to any model you choose. It requires more setup and oversight than simple autocomplete tools, but for developers who want full control over their AI workflow, Cline is outstanding — and completely free.
Cline is an open-source AI coding agent that runs as a VS Code extension. Unlike autocomplete assistants, Cline operates autonomously — it reads your codebase, plans changes, edits multiple files, runs terminal commands, and self-corrects based on results. You control which AI model powers it, from Claude to GPT to open models.
It's essentially a free, self-hosted alternative to commercial agentic coding tools, with the transparency and flexibility that open source provides.
We used Cline to build real features over 3 weeks:
Cline's strength is true agentic behavior. Given a task, it explores your project, forms a plan, and executes — writing code, running it, reading errors, and iterating until done. This hands-on, feedback-driven loop handles complex, multi-step tasks far beyond simple code suggestions.
"Cline refactored a messy legacy module for us over a weekend while we focused on other work. It read the codebase, planned the migration, wrote tests, and iterated through failures on its own. The transparency of seeing every step made us trust it."
A major differentiator. Cline works with virtually any model via API — Claude, GPT, Gemini, or open-source models. You can pick the best value model for each task, self-host, or avoid vendor lock-in entirely. This flexibility is unmatched by most commercial tools.
Plans and executes multi-step tasks: reading code, editing files, running commands, and self-correcting.
Connect any AI model via API — Claude, GPT, Gemini, or open models — and switch freely.
Runs commands and edits files directly in your project, with full visibility into every action.
Free extension; you only pay for the model API you choose. Full transparency into how it works.
Cline's pricing model is refreshing:
For teams already paying for model APIs, Cline adds powerful agentic coding at no extra license cost.
Cline is the strongest open-source AI coding agent we've tested. It delivers genuine autonomous coding — planning, editing, running, and self-correcting — while letting you use any model you want, free of license fees and vendor lock-in. It demands more from the user than a plug-and-play tool, and you should review its work. But for developers who value control, flexibility, and transparency, Cline is an outstanding and remarkably capable choice.
| Feature | This Tool | GitHub Copilot |
|---|---|---|
| Score | 8.3/10 | 8.6/10 |
| Price | Free (open) / API | From $10/mo |
| Agentic | Yes (autonomous) | Limited |
| Best For | Control & flexibility | Autocomplete |
Cline is open-source and free as a VS Code extension. You pay only for the AI model API usage (e.g., Claude or GPT) that you connect to it.
Yes, Cline is a powerful autonomous coding agent that can plan, write, edit, and run code across your project. It's highly capable but requires more setup and oversight than simpler autocomplete tools.
Copilot is mainly an autocomplete assistant. Cline is an autonomous agent that can execute multi-step tasks, edit multiple files, run commands, and self-correct — much more powerful but more hands-on.
Our scoring is based on: Features (30%), Ease of Use (20%), Performance (25%), Value (15%), and Support (10%). Each tool is tested for 2-4 weeks of real-world use before scoring.