Review of Cline
Cline is an open-source AI coding agent that integrates directly into VS Code. It can create and edit files, run terminal commands, browse the web, and interact with MCP tools. Used by over 5 million developers, Cline offers a Plan/Act mode for planning and executing complex tasks autonomously and transparently. It's compatible with all major AI providers (Anthropic, OpenAI, Gemini, DeepSeek…) and supports the BYOK (Bring Your Own Key) model.
Cline: L'agent de coding IA open source le plus populaire pour VS Code.
Best for
- VS Code developers looking for an agentic copilot
- Teams adopting an AI-first development approach
- Engineers looking to automate repetitive tasks
- Builders leveraging MCP protocols for their workflows
Not ideal for
- Developers not using VS Code
- Beginners without programming foundations
- Teams with very limited API budgets
- Projects requiring a SaaS solution without configuration
Pros & cons
- ✅ Open source trusted by 5M+ developers worldwide
- ✅ Plan/Act modes for controlled autonomy at every step
- ✅ Compatible with all major LLMs (Claude, GPT, Gemini, DeepSeek…)
- ✅ MCP Marketplace integration to extend agent capabilities
- ✅ Real-time access to terminal, browser, and file system
- ✅ Full transparency on API costs with BYOK
- ⚠️ Requires VS Code as environment (no standalone app)
- ⚠️ LLM API costs can be high depending on the model chosen
- ⚠️ Learning curve to master MCP workflows
- ⚠️ Agent autonomy may require regular supervision
Our verdict
Cline stands out as one of the most advanced and widely adopted AI coding agents in the open-source market. With over 5 million developers, it benefits from a strong community and rapid evolution. Its Plan/Act architecture allows delegating complex tasks to the agent while maintaining precise control at every step. Compatibility with all major LLM providers and the BYOK model offer maximum pricing flexibility. The MCP Marketplace integration turns Cline into a truly extensible platform capable of interacting with third-party services. Its main limitations are its dependency on VS Code and API costs that can rise quickly with premium models. For serious teams and developers looking to adopt an AI-first workflow, Cline is an essential reference choice.
Alternatives to Cline
- Vibe-coding platform to build and deploy web/mobile apps through conversation.No-CodeCode Generation+1
- AutoGen is Microsoft's open-source framework for building multi-agent AI systems capable of collaborating, reasoning, and solving complex tasks in Python or .NET.AI Agents+1
- Coding Plan compares AI coding plans side by side — pricing, models, usage limits, and supported tools — covering Claude Code, GLM, MiniMax, Kimi, and Qwen.Code Generation+3
- Phind is an AI search engine built for developers, delivering precise technical answers with working code snippets, step-by-step explanations, and cited sources.Research Assistant+2
- The leading multi-agent AI platform for building, deploying, and orchestrating autonomous AI agent teams that automate complex workflows in production.Autonomous Agents+3
- Leading open source agentic workflow platform: RAG, no-code pipelines, MCP integration, and production deployment for teams of any size.Autonomous Agents+3
- Open source LLM engineering platform: observability, evaluations, prompt management, and metrics to debug and improve your AI applications in production.Open Source+3
- AI copilot with OS-level long-term memory for developers: automatic context capture, snippet management, and contextual AI assistant across all your tools.Long-Term Memory+3
- Prompt engineering platform for AI teams: versioning, evaluations, LLM observability, and collaboration between engineers and non-technical domain experts.Code Generation+3
- AI-powered website and app builder using a multi-agent “AI team” to plan, generate, edit and publish products fast, with hosting and custom domain options.No-CodeCode Generation+1
- Fast AI chat assistant powered by GLM models, strong for research and coding supportAI Assistant+3
- AI coding assistant integrated into your IDE to autocomplete, explain, refactor, and speed up debugging and reviews.Code Generation+3
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FAQ
Is Cline free?
Yes, Cline is a free open-source tool. You only need an API key from an LLM provider (Anthropic, OpenAI, Gemini…). Some models like Gemini Flash are available for free.
What is the difference between Plan and Act modes?
Plan mode lets Cline think and propose a strategy before acting. Act mode directly executes actions. You can switch between the two depending on the level of supervision you want.
Does Cline only work with VS Code?
Cline is a VS Code extension. There is no standalone application. It works in all VS Code-based editors, including Cursor and some forks.
What is the Cline MCP Marketplace?
The MCP Marketplace is an integrated marketplace for installing MCP (Model Context Protocol) servers that extend Cline's capabilities: database access, web tools, third-party APIs, and more.
Is Cline secure for professional code?
Cline only sends your code to the LLM provider you configured. By using on-premise or local models, you can keep code completely private. All actions are always subject to your approval.