Cline

Cline is a free, open-source autonomous AI coding agent built directly into Visual Studio Code. It lets developers plan complex tasks, edit files, run terminal commands, and even control a browser — all with your explicit permission at each step. We rate it 84/100 — an outstanding choice for developers who want the power of an AI coding agent without a monthly subscription, and the flexibility to use any AI model they prefer.

What Is Cline?

Cline, originally released as "Claude Dev" in 2024 by Saoud Rizwan and now maintained by Cline Bot Inc., has grown into the most widely adopted open-source AI coding extension in the VS Code ecosystem. As of March 26, 2026, the extension has accumulated over 3.4 million VS Code Marketplace installs, a 4.5-star rating from 276 reviews, and 59,700 GitHub stars — all without charging users a single dollar in subscription fees.

Unlike proprietary tools such as Cursor or Windsurf that bundle their own AI model subscriptions, Cline is a pure agent layer: you connect it to your own AI provider (Anthropic, OpenAI, Google Gemini, AWS Bedrock, local Ollama models, and more), pay that provider directly, and Cline charges nothing on top. This model-agnostic approach has earned it trust from enterprise teams at Samsung, Salesforce, Oracle, Amazon, Microsoft, IBM, Visa, and eBay.

Key Features of Cline

• Plan / Act Modes: Cline uniquely separates planning from execution. In Plan mode, the AI proposes a step-by-step approach before touching any code. You review, adjust, and approve — then Cline executes. This catches bad ideas before they cause damage and is the feature users most frequently praise in reviews.
• Any AI Model, Any Provider: Cline supports OpenRouter, Anthropic (Claude), OpenAI (GPT-4o, o3), Google Gemini, AWS Bedrock, Azure OpenAI, GCP Vertex, and local models via Ollama. Switch models mid-session to balance quality against cost.
• Full Filesystem + Terminal Access: Cline reads your entire project, creates and edits files with a diff-based approval flow, and executes terminal commands — all with explicit user confirmation before each action. No silent changes.
• Browser Automation: Cline can launch a browser, navigate URLs, click elements, fill forms, and capture screenshots. This enables end-to-end testing, scraping, and UI debugging without leaving your IDE.
• Model Context Protocol (MCP): Cline fully supports Anthropic's MCP standard, letting you connect custom tools — databases, APIs, Slack, GitHub — as additional context sources and action targets for the agent.
• Workspace Checkpoints: Before any significant change, Cline creates a checkpoint. Unhappy with the output? Roll back instantly without manually undoing edits.

What Users Say About Cline

On Reddit's r/ClaudeAI and r/vscode, Cline is consistently praised for its measured, thoughtful approach. One frequently cited review notes: "With Cline, it's like having a senior dev who actually reads and understands your entire codebase before making suggestions — comprehensive, thoughtful, and it saves you time in the long run." Hacker News threads highlight its token efficiency, with users reporting full five-hour build sessions for roughly $6 using Claude Sonnet 3.5 with careful configuration.

The main complaints are about API costs at scale. Heavy users report spending $50–$200 per month in Claude API fees during intensive projects. On Product Hunt, reviewers applaud the Plan/Act separation but note that Cline is not an inline autocomplete tool — it's a task-level agent, and developers who want tab-completion still need a separate extension like GitHub Copilot. Security-sensitive teams in healthcare and finance also flag the absence of formal SOC 2 or HIPAA certifications as a barrier to adoption.

Cline Pricing

Cline itself is completely free under the Apache 2.0 open-source license. There are no tiers, no seat fees, and no usage caps imposed by Cline. You pay only for the AI model API calls you make:

Plan	Price	What You Pay
Cline (open source)	$0/month	Nothing to Cline
Claude Sonnet API (typical)	~$5–$50/month	Directly to Anthropic, based on tokens used
Heavy agentic sessions	Up to $200/month	Depends on model choice and session length
Local model (Ollama)	$0/month	No API costs — run locally on your hardware

A Cline Enterprise tier exists for teams that need admin controls, audit logs, and SSO. Pricing is available by contacting Cline Enterprise.

Who Should Use Cline?

Best for: Individual developers, open-source contributors, and small teams who want a powerful AI coding agent without vendor lock-in. Ideal for projects where you already have an AI API subscription (e.g., Anthropic Pro or OpenAI tier) and want to put those credits to work inside VS Code. Also excellent for developers who want to run fully local, private models via Ollama at zero API cost.

Not ideal for: Developers who primarily want inline tab completions rather than agentic task execution — for that, GitHub Copilot or Supermaven are better fits. Enterprise teams in regulated industries (healthcare, finance, government) requiring SOC 2, HIPAA, or FedRAMP certification should evaluate Cursor or GitHub Copilot Enterprise instead, as Cline does not currently publish compliance certifications.

Pros and Cons

Pros:

• Completely free — no subscription or seat fees; just pay your AI provider directly
• Supports every major AI model and provider, including local models via Ollama
• Plan/Act separation gives developers meaningful oversight before any code changes
• Active development (version 3.76.0 released March 26, 2026) with a large community
• MCP support enables powerful integrations with external tools and APIs
• 59.7k GitHub stars and 3.4M+ installs confirms real-world production adoption

Cons:

• API costs can reach $50–$200/month for heavy agentic sessions — no cost ceiling
• No inline autocomplete; Cline is a task agent, not a code completion engine
• Output quality is model-dependent; weaker models produce weaker results
• No published SOC 2, HIPAA, or FedRAMP certifications for regulated industries
• Long, complex sessions can occasionally lose context or require manual checkpointing

Alternatives to Cline

Cursor offers a tighter editor integration with built-in AI and a $20/month Pro plan — less flexible on model choice but more polished out of the box. Claude Code (Anthropic's official CLI agent) covers similar agentic territory but lives in the terminal rather than inside VS Code. Aider is another open-source coding agent for CLI purists who prefer working outside an IDE entirely.

Verdict: Is Cline Worth It?

At zero subscription cost, Cline is unambiguously worth trying for any developer who already has an AI API key. It is the most capable free, open-source AI coding agent available for VS Code as of 2026, and its 3.4 million installs are a credible signal that it delivers real value in real workflows. The Plan/Act mode is genuinely differentiated — it brings the kind of thoughtful, step-by-step agent behavior that makes agentic coding feel safe rather than chaotic. We rate it 84/100: highly recommended for individual developers and teams comfortable managing their own API costs, with a note that enterprises in regulated industries should check compliance requirements first.

Frequently Asked Questions

Is Cline free?

Yes. Cline itself is completely free and open source under the Apache 2.0 license. You only pay your AI model provider (Anthropic, OpenAI, Google, etc.) for the API tokens you consume. There is no Cline subscription fee.

What AI models does Cline support?

Cline supports Anthropic Claude, OpenAI GPT-4o and o3, Google Gemini, AWS Bedrock, Azure OpenAI, GCP Vertex, OpenRouter, and local models via Ollama. You can switch between models at any time.

How does Cline compare to Cursor?

Cursor is a standalone AI-powered editor fork of VS Code that costs $20/month (Pro) and bundles its own AI models. Cline is a free VS Code extension that works with any AI model you supply. Cursor offers a more polished, integrated experience; Cline offers more flexibility and zero subscription cost. Neither offers the other's specific strengths.

Is Cline open source?

Yes. Cline is open source under the Apache 2.0 license. The full source code is available at github.com/cline/cline.

Does Cline work with local AI models?

Yes. Cline integrates with Ollama, allowing you to run fully local, private AI models at no API cost. This makes it suitable for air-gapped environments or developers who want complete data privacy.