← Back to All Tools
Development Free Tier Available

Cline

Cline is an open-source autonomous coding agent that runs inside Visual Studio Code and compatible forks. Operating as an interactive developer assistant, Cline can create and modify files across large codebases, execute terminal commands, view compiler and linter output, and browse websites via headless browser automation to test local web applications.

Unlike closed-ecosystem AI editors, Cline utilizes a Bring Your Own Key (BYOK) architecture. Developers connect their own API keys from providers such as Anthropic (Claude 3.5 Sonnet, Claude 3.7 Sonnet), OpenAI, Google Gemini, DeepSeek, AWS Bedrock, or local model servers via Ollama. With support for the Model Context Protocol (MCP), Cline can extend its capabilities to interact with external databases, issue trackers, and custom command-line tools while keeping code execution under human-in-the-loop approval.

Visit Cline Compare Cline

Our tools are evaluated against our Scoring Methodology.
Spot an error? Request a Correction.

Best For

  • Software engineers seeking an autonomous coding agent directly inside VS Code without switching to a separate forked IDE
  • Developers wanting granular cost control by using their own direct API keys or local self-hosted models via Ollama
  • Teams requiring custom tool integrations through the Model Context Protocol (MCP) for terminal and database execution

Not Ideal For

  • Non-technical users or beginners who lack API keys and prefer an all-inclusive managed flat-rate subscription
  • Developers who do not want to manage individual provider rate limits, context window tokens, or API billing balances
  • Users seeking a fully turnkey zero-configuration setup that works out-of-the-box without configuring environment permissions

How It Works

Cline operates as an agentic loop within Visual Studio Code. When given a development prompt, Cline analyzes the project workspace by reading directory structures, inspecting configuration files, and identifying relevant source files using semantic search and fuzzy matching. It formulates a multi-step execution plan and presents each proposed action to the developer.

Before executing any file write, deletion, or terminal command, Cline requests explicit user authorization unless configured in auto-approve mode for specific safe commands. When testing web applications, Cline can launch a browser sub-process to inspect DOM elements, capture screenshots, and diagnose frontend rendering errors. Every token consumed is tracked against the connected API provider balance in real time.

Key Features

Agentic Execution & Terminal Control

  • Autonomous multi-file editing with diff preview and approval gates before code changes are applied
  • Integrated terminal command execution with automated error detection, stack trace analysis, and retry logic
  • Headless browser integration enabling the agent to visually inspect local web apps, capture console logs, and click elements
  • Context-aware file indexing that respects .gitignore rules and project-specific instruction files (.clinerules)

BYOK Flexibility & Extensibility

  • Direct API provider support for Anthropic Claude, OpenAI, Google Gemini, DeepSeek, AWS Bedrock, and OpenRouter
  • Local model compatibility via Ollama and LM Studio for completely offline, air-gapped code generation
  • Model Context Protocol (MCP) client support allowing custom tools, databases, and APIs to be called by the agent
  • Granular per-task token usage and cost accounting displayed in the VS Code sidebar interface

Strengths & Limitations

Strengths

  • Zero subscription markup on LLM tokens because developers pay standard provider wholesale API rates directly
  • Native integration with existing VS Code workspaces, settings, keybindings, and extensions without needing an IDE fork
  • Robust security model requiring explicit manual approval for shell commands and destructive file modifications
  • Extensible tool ecosystem via the open Model Context Protocol (MCP) standard

Limitations

  • Requires developers to create and fund separate API accounts with Anthropic, OpenAI, or other providers
  • High token consumption during large refactoring tasks can lead to unexpected API usage bills if unmonitored
  • Complex multi-step terminal actions occasionally require manual intervention to recover from failed command runs
  • Lack of a centralized administrative dashboard for managing team-wide seats or shared prompt policies

Pricing

Cline is completely free and open-source software distributed under the Apache 2.0 license ($0 per month). There are no software subscription fees, paywalls, or platform surcharges.

Because Cline operates on a Bring Your Own Key (BYOK) architecture, users only pay the direct API token costs billed by their chosen model provider (such as Anthropic, OpenAI, DeepSeek, or Google Cloud). For example, using Anthropic Claude 3.5 Sonnet typically costs approximately $3.00 per million input tokens and $15.00 per million output tokens, while local inference via Ollama (/tools/ollama/) is entirely free of usage charges.

How It Compares

Compared to Cursor (/tools/cursor/), which is a standalone fork of VS Code with a proprietary background indexing service and a $20 per month subscription tier, Cline runs inside standard Visual Studio Code as a community extension and charges no platform markup. Compared to Aider (/tools/aider/), which operates strictly in the terminal command line with Git-based diff commits, Cline provides a graphical sidebar with interactive diff views, MCP tool integration, and browser testing. Compared to GitHub Copilot (/tools/github-copilot/), which relies primarily on inline completions with a fixed model catalog, Cline delivers autonomous multi-file agentic task execution.

Visit Cline

Browse more Development tools →