Cline
The most capable open-source VS Code coding agent with the broadest model support (10+ providers) and 5M+ installs.
The most capable open-source VS Code coding agent with the broadest model support. Ideal for developers who want agentic AI without vendor lock-in.
Cline is the most-installed open-source coding extension on VS Code (5M+ installs, 60K GitHub stars) and the broadest in model support, 10+ providers including local models via Ollama. Its Plan/Act dual mode provides structured agentic workflows uncommon in free tools, and the ability to create MCP servers at runtime means the agent can extend its own toolset during a session.
The BYOK model has a hidden cost: practitioners report $200-500/month in API costs for heavy usage, with one developer seeing costs jump from $30 to $230 in a single month doing similar work. At that spend level, a fixed-price subscription to Cursor ($20/mo) becomes more predictable.
The February 2026 supply chain attack (npm token compromise affecting ~4,000 users in an 8-hour window) is a cautionary note, open source is not risk-free. But Cline's privacy model (code stays local, you control which model handles which task) and the fact that it's genuinely free make it the best starting point for developers who want agentic AI without vendor lock-in.
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