Cline was created by Saoud Rizwan as an open-source side project called Claude Dev in late 2024. It grew fast. GitHub's Octoverse 2025 named it the fastest-growing AI-focused open-source project on the platform, with 4,704 percent year-over-year contributor growth. The extension now has over 50,000 GitHub stars and has been installed by more than five million developers.

In July 2025, the company raised $32 million in combined seed and Series A funding led by Emergence Capital, with participation from Pace Capital, 1984 Ventures, and angel investors including Jared Friedman (Y Combinator) and Eric Simons (Bolt.new). The funding supports an enterprise platform with SSO, role-based access control, and audit logging.

Cline's core proposition is autonomy without lock-in. It supports Anthropic Claude, OpenAI, Google Gemini, AWS Bedrock, Azure, Mistral, and local models through Ollama. You bring your own API key, pay the model provider directly, and keep full control of where your code goes. Fortune 500 companies including Samsung and SAP have adopted it for production engineering work.

True model agnosticism with zero vendor lock-in. Cline supports over a dozen API providers and local models. You are never locked into a single model vendor or pricing tier. If Anthropic raises prices, switch to Google. If you need air-gapped security, run a local model through Ollama. No other major coding agent offers this level of provider flexibility.

Plan/Act mode is genuinely smart workflow design. Cline's Plan/Act toggle splits coding into two phases: Plan mode reads the codebase, asks questions, and proposes a strategy. Act mode executes it. You can assign different models to each phase, using a reasoning-heavy model like Claude Opus for planning and a faster, cheaper model for execution. This optimises both quality and cost in a way that monolithic AI editors cannot replicate.

MCP integration extends capabilities without limits. Cline was one of the first coding agents to support the Model Context Protocol, letting developers connect to databases, cloud platforms, and custom tooling through standardised servers. You can ask Cline to build an MCP server from a natural language description. The community has produced hundreds of servers covering everything from Jira to AWS to PagerDuty.

Human-in-the-loop by default. Every file change and terminal command requires explicit approval before execution. This is not a configurable setting buried in preferences. It is the default operating model. For teams concerned about autonomous agents making unsupervised changes to production code, this is a meaningful safety feature that distinguishes Cline from tools that default to full autonomy.

Open source means full auditability. The entire codebase is Apache 2.0 licensed on GitHub. Enterprises can audit every line of code, verify that no telemetry is being collected, and fork the project if needed. As we noted in our best AI coding tools buying guide, open-source transparency is becoming a procurement requirement for security-conscious organisations.

API costs add up and are hard to predict. Because Cline passes all inference to external providers, costs scale with usage. A typical coding session can run $0.50 to $3.00 depending on the model and task complexity. Heavy users report spending $100 or more per month on API fees alone. There is no flat-rate option that caps costs, which makes budgeting difficult for teams.

No integrated editor, just an extension. Cline lives inside VS Code. It does not offer its own editor experience, codebase indexing, or proprietary models the way Cursor does. Developers who want a fully integrated AI-native editor with custom models may find Cline's extension-only approach limiting.

Enterprise platform is early-stage. The $32 million raise funds an enterprise offering with SSO, RBAC, and audit logs. But the enterprise product launched alongside the funding announcement in mid-2025. Organisations evaluating Cline for large-scale deployment should expect the enterprise feature set to mature over 2026.

Cline is free to install from the VS Code Marketplace. You bring your own API key and pay model providers directly. Open Source Teams is free through Q1 2026, then $20/month with the first 10 seats always free. Enterprise pricing with SSO, RBAC, and audit logging is custom. Deployment is a VS Code extension install, with no additional infrastructure required.

Cline runs entirely within the VS Code extension API. When using your own API keys, no code is sent to Cline's servers. The open-source codebase (Apache 2.0) is fully auditable. The enterprise tier adds SSO, role-based access control, and audit logging. Cline does not currently hold SOC 2 or ISO 27001 certification, which is expected for a company at this stage of maturity.

Overall: 4/5

Cline is the right choice for developers and teams who want maximum flexibility in their AI coding workflow. If you value model choice, open-source transparency, and the ability to run autonomous coding agents without being locked into a proprietary editor, Cline delivers what no closed-source alternative can match. Teams that need formal security certifications, a fully integrated editor experience, or predictable monthly costs should evaluate Cursor or GitHub Copilot instead. With $32 million in funding, a five-million-strong install base, and the fastest-growing open-source AI project on GitHub behind it, Cline is positioning itself as the default agent layer for developers who want control without compromise.

Try Cline: cline.bot

Is the future of AI coding agents open-source and model-agnostic, or will proprietary editors with custom models dominate? Where does Cline fit in your stack?

Editorial disclaimer: Reviews reflect the independent editorial assessment of Major Matters and are not sponsored or endorsed by the companies reviewed. We recommend conducting your own evaluation to determine whether any product is the right fit for your specific requirements.