Cline

3.2 (1 reviews)

Developer Tools , AI Assistant , Automation & Agents

An open-source VS Code extension that functions as an autonomous coding agent, capable of executing multi-step engineering tasks through file manipulation, terminal access, and browser-based testing.

Excellent for developers who want an autonomous agent within their existing VS Code environment, but weaker for those who prefer the polished, integrated experience of a custom IDE like Cursor.

Ai Coding Assistant Vs Code Ide Integration Open-Source Ai Agents Software Engineering Debugging Code Generation

Analysis based on product data, pricing structure, traffic signals, and public user sentiment.

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Who Should Use Cline?

Typical users

Individual software engineers and small dev teams who are comfortable managing their own LLM API keys and want to automate repetitive coding workflows.

Maturity fit

advanced

Choose this if…

You want to keep your existing VS Code configuration and extensions
You prefer bringing your own API keys (BYOK) to control costs and model selection
You need an agent that can autonomously run terminal commands and debug via a browser
You want to leverage the Model Context Protocol (MCP) to extend your agent's capabilities

Skip this if…

You want a zero-config, 'it just works' experience without managing API credits
You require the deep, low-level IDE optimizations found in dedicated forks like Cursor
Your security policy prohibits third-party extensions from executing terminal commands

About Cline

Cline (formerly Claude Dev) is an open-source autonomous coding assistant for VS Code. It is designed to handle complex, multi-file engineering tasks by acting as a virtual pair programmer with full system access.

Official profiles

GitHub

What it actually does

Cline uses a 'Plan-and-Act' loop to break down natural language prompts into technical steps. It can read and write files, execute shell commands to run builds or tests, and use a headless browser to verify frontend changes, all while requiring human approval for sensitive actions.

What makes it different

Unlike standard autocomplete tools, Cline is agentic and open-source. It doesn't just suggest code; it executes the workflow. Its support for the Model Context Protocol (MCP) allows it to interact with external tools like GitHub, Slack, or local databases, making it more extensible than proprietary alternatives.

Autonomous multi-file editing Terminal command execution and monitoring Headless browser automation for UI testing Model Context Protocol (MCP) integration Real-time token and cost tracking Human-in-the-loop approval for all actions Support for local and cloud-based LLMs

Ratings across the web

3.2 (1 reviews)

Trustpilot 1 reviews

3.2/5

Ratings aggregated from independent review platforms.

Key Features

Plan-and-Act Workflow

Forces the agent to outline its strategy before touching code to reduce errors.

Terminal Integration

Allows the agent to install dependencies, run migrations, and execute test suites independently.

Browser Tooling

Enables the agent to view rendered web pages and capture screenshots to debug CSS or layout issues.

MCP Support

Connects the agent to your broader tech stack, such as searching documentation or checking Jira tickets.

BYOK (Bring Your Own Key)

Supports Anthropic, OpenAI, Google, and local providers like Ollama via OpenRouter or direct API.

Context Management

Automatically manages the conversation history to stay within model context limits while maintaining task focus.

Pricing

Popular

Open Source

Free

Full access to all features
No usage limits from the extension
Support for any LLM provider
Community-driven updates

API Costs

Variable per use

Pay only for what you use
Determined by your LLM provider (Anthropic, OpenAI, etc.)
Typically $0.10 - $2.00 per complex task

Pricing checked 5 months ago

Pricing guidance

Best plan for most users: The Open Source extension is the only version; your choice of LLM provider (e.g., Anthropic via OpenRouter) determines your actual cost.

Free plan enough? Yes, the software is free, but you cannot use it without paying an external LLM provider for API credits.

Upgrade when:

When you need faster inference (switch to a higher-tier API)
When you hit rate limits on free-tier API keys
When you want to use more capable models like Claude 3.5 Sonnet

Watch out for:

Rate limits are imposed by your API provider, not Cline
Context window limits of the chosen model can restrict the size of the codebase Cline can 'see' at once

Extremely cost-effective for light users; can become expensive for power users compared to flat-rate subscriptions like GitHub Copilot.

Pros & Cons

Strengths

High degree of autonomy
It can handle complex refactors or feature implementations that span multiple files without needing constant micro-management.
Zero vendor lock-in
Because it is a VS Code extension and uses your own API keys, you aren't tied to a specific IDE fork or a monthly subscription.
Extensible via MCP
The ability to add custom 'tools' through MCP means Cline can grow to understand your specific company's internal APIs or databases.
Transparent cost tracking
It provides a clear breakdown of how much each task costs in real-time, preventing surprise bills from API providers.

Weaknesses

High token consumption
Agentic workflows require sending large amounts of context repeatedly, which can make complex tasks expensive compared to simple autocomplete.

Affects: Developers on a tight budget or those using expensive models like Claude 3.5 Opus.
Approval fatigue
The safety-first approach requires clicking 'Approve' for every file write or terminal command, which can break the flow during long tasks.

Affects: Users performing large-scale refactors or repetitive migrations.
Occasional 'looping' behavior
Like all agents, Cline can occasionally get stuck in a loop trying to fix a bug it created, consuming tokens without making progress.

Affects: Beginners who may not know when to step in and manually correct the agent.

Real User Sentiment

Highly positive, with users praising its 'bravery' in executing terminal commands and its transparency regarding costs.

Users tend to like

The ability to run tests and fix them autonomously
Integration with the Model Context Protocol (MCP)
Real-time cost tracking per session
Not having to switch away from a customized VS Code setup

Users commonly complain about

The UI can feel cluttered compared to native IDE integrations
Frequent 'Approve' prompts can be annoying
High API costs when using top-tier models for long sessions

Recurring tradeoffs

You trade the convenience of a flat-rate subscription for the control of pay-as-you-go API keys.

Happiest users

Power users who have specific VS Code setups and want an agent that can 'actually do the work' rather than just talk about it.

Often frustrated

Users who expect a free lunch and are surprised by the API costs associated with agentic reasoning.

Use Cases

Greenfield development

Generating entire boilerplate structures and initial features from a single prompt.

Legacy refactoring

Asking the agent to identify and update deprecated patterns across a large codebase.

Test-driven development

Providing a requirement and letting the agent write the code, run the tests, and iterate until they pass.

Documentation syncing

Using MCP to pull data from internal docs and update code comments or READMEs accordingly.

Frontend debugging

Letting the agent use the browser to identify why a component isn't rendering correctly and fixing the CSS.

Frequently Asked Questions

Is Cline free to use?

The Cline extension itself is free and open-source. However, you must pay for the LLM API calls it makes. You will need an API key from a provider like Anthropic, OpenAI, or a consolidator like OpenRouter. Costs depend entirely on your usage and the model you choose.

How does Cline compare to Cursor?

Cursor is a standalone fork of VS Code with deep, native AI integration and a $20/month subscription. Cline is an extension for the standard VS Code that uses a 'Bring Your Own Key' model. Cursor feels more 'polished,' but Cline offers more autonomy (terminal/browser access) and doesn't require you to switch IDEs.

Is Cline safe to use with my terminal?

Cline requires your permission before executing any terminal command. You can see exactly what it plans to run. While it is powerful, you should always review the commands, especially those involving file deletion or network requests.

Which LLM model is best for Cline?

As of early 2024, Claude 3.5 Sonnet is widely considered the best model for Cline due to its high reasoning capabilities and efficiency in following complex instructions. You can also use GPT-4o or local models via Ollama, though performance may vary.

What is MCP in Cline?

MCP stands for Model Context Protocol. It is an open standard that allows Cline to connect to external tools. For example, you can give Cline an MCP server for Google Drive, and it will be able to read your documents to help write code.

Does Cline work with languages other than JavaScript/TypeScript?

Yes, Cline is language-agnostic. It works by reading and writing text files and executing terminal commands, so it can handle Python, Rust, Go, C++, and any other language your terminal can compile or run.

Why trust this page?

This evaluation combines product positioning, pricing analysis, traffic and market signals, and public user sentiment into a single decision-support page. Content is generated editorially — not copied from the vendor's website.

Funding & Company

Founded

2024

Stage

Series a

Total Raised

$32M

Latest Round

Series A (Jul 2025)

Notable Investors

Emergence Capital Pace Capital 1984 Ventures

Cline has raised a total of $32 million across Seed and Series A rounds. The most recent funding was a $27 million Series A in July 2025, led by enterprise SaaS investor Emergence Capital. This capital is intended to expand its enterprise offering, Cline Teams, and grow its engineering team.

Full funding report medium confidence

Market Signals & Traffic

Estimated visits, global rank, geography, traffic sources, monthly visit trends, and organic search keywords (Similarweb)—on a dedicated page built for depth and search.

Estimated visits: 0
Global rank: —
Snapshot: May 2026
Traffic trend: —