Cline
Cline / github.com
Open source VS Code extension that gives an AI agent the ability to create and edit files, execute terminal commands, and complete tasks autonomously within VS Code.
Pricing
Free
Free plan
Yes
Category
Coding
Platforms
1
Rating
4.7 (10000)
Free plan
Yes
API access
No
Open source
Yes
Platforms
1
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What is Cline?
Cline is an open source VS Code extension that turns the IDE into an environment for an AI agent capable of taking autonomous actions — creating and editing files, running terminal commands, installing packages, and browsing the web — to complete software engineering tasks from natural language instructions.
The agent loop in Cline is designed for transparency. Every action the agent proposes — file creation, command execution, browser interaction — is shown to the developer for approval before execution. This human-in-the-loop design provides oversight over the agent's actions without requiring the developer to write all the code manually. It is more controlled than fully autonomous agents but more capable than pure code suggestion tools.
Cline integrates natively with VS Code, which means it has access to the full VS Code workspace context and can interact with the entire project file structure. The agent can open files, search across the codebase, run the project's test suite, and install dependencies as part of task completion.
The browser automation capability allows Cline to navigate to documentation pages, read the content, and use that information in task completion — similar to how a human developer would look up an API before using it.
Like OpenHands and Aider, Cline is model-agnostic. Users configure it with their own API keys for Claude, GPT-4, or any compatible model. Using Claude Sonnet is common for its strong coding reasoning and relatively low cost per token.
Cline has grown rapidly within the VS Code developer community as a capable, free alternative to commercial agentic tools. The VS Code extension model means it works alongside existing editor workflows without requiring a tool switch.
How Cline works
Cline runs as code llm agent software built around text and code workflows. Users typically start with a prompt, upload, or connected data source, and the underlying model handles the heavy lifting before returning a result you can refine or export. It's available on vs code.
What makes it worth shortlisting
The capabilities that matter most for teams evaluating Cline.
Autonomous task execution
Plans and executes multi-step coding tasks including file creation, editing, and terminal commands from natural language instructions.
Human-in-the-loop approval
Shows every proposed action for developer approval before execution, providing oversight without requiring manual coding.
MCP tool integration
Extends agent capabilities with Model Context Protocol tools for additional resources and integrations.
Best use cases
Who should use it
Pros
- Free VS Code extension with autonomous coding capabilities
- Human-in-the-loop approval is transparent and controllable
- Works in existing VS Code workflow without switching editors
- Large and fast-growing community with frequent improvements
Cons
- API costs accumulate quickly for complex tasks using expensive models
- Human approval steps slow down fully autonomous workflows
- Quality depends heavily on the quality of the configured AI model
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Is it worth the price?
Free and open source. Requires your own AI model API keys. No subscription cost beyond API usage.
Model
Open Source
Starting price
Free
Free trial
No
Tools like Cline
GitHub Copilot is a polished commercial alternative with GitHub ecosystem integration. Cursor offers a more integrated AI-native VS Code fork. OpenHands is more autonomous for complex multi-step tasks. Continue.dev is a simpler model-agnostic coding assistant.
Cline vs GitHub Copilot
A side-by-side look at the closest alternative in this category.
Cline
Cline
GitHub Copilot
GitHub (Microsoft)
Free and open source. Requires your own AI model API keys. No subscription cost beyond API usage.
Free tier with 2,000 completions and 50 premium requests/month. Pro $10/month. Pro+ $39/month. Business $19/user/month. Enterprise $39/user/month (requires GitHub Enterprise Cloud).
Open source codebase. Code sent to configured AI provider for reasoning. Self-contained within VS Code environment. Review chosen provider's data handling policy.
Business and Enterprise exclude code from model training. Enterprise includes SSO and audit logs.
Code is sent to your configured AI provider (Anthropic, OpenAI, etc.) for reasoning. Review the data handling policy of your chosen provider. No other external data transmission.
Free plan users: code may be used for model training unless opted out. Business and Enterprise opt out by default. Review settings before using with proprietary code.
- Free VS Code extension with autonomous coding capabilities
- Human-in-the-loop approval is transparent and controllable
- Works in existing VS Code workflow without switching editors
- Large and fast-growing community with frequent improvements
- Genuinely useful free tier
- Widest editor support of any AI coding tool
- Multi-model choice on paid plans
- Deep GitHub ecosystem integration
- API costs accumulate quickly for complex tasks using expensive models
- Human approval steps slow down fully autonomous workflows
- Quality depends heavily on the quality of the configured AI model
- Free plan limits modest for daily professional use
- Business pricing adds up for larger teams
- Enterprise requires GitHub Enterprise Cloud subscription
Technical & deployment info
Key facts about model providers, platforms, and team support.
Model Provider
Anthropic, OpenAI, Agnostic
Models
Claude Sonnet, GPT-4o, Any compatible
Platforms
VS Code
Deployment
Open Source
Integrations
GitHub, Git, Terminal, Browser, Any AI API
Team Collaboration
No
Launch Year
2024
Security & privacy
Compliance signals and data-handling notes as reported by the vendor.
Open source codebase. Code sent to configured AI provider for reasoning. Self-contained within VS Code environment. Review chosen provider's data handling policy.
Code is sent to your configured AI provider (Anthropic, OpenAI, etc.) for reasoning. Review the data handling policy of your chosen provider. No other external data transmission.
What users are saying
Verified reviews from signed-in users, stored in the backend and averaged into this tool's rating.
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Common questions about Cline
Editorial Verdict
Should you use Cline?
Cline is one of the best free options for VS Code developers who want AI agent capabilities with transparent human oversight. For developers who prefer a fully autonomous workflow, OpenHands is more appropriate.
Last verified July 24, 2026.