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Cline is the open-source VS Code extension that turned "bring your own API key" into a legitimate alternative to Cursor and Copilot. Over 5 million installs, an active community, and a genuinely agentic workflow — plan/act modes, terminal execution, browser automation, MCP support. We ran it as a daily driver for 5 months. Here's what actually held up.
The one-line verdict
4.0/5. Cline is the most capable free AI coding extension for VS Code, and the Plan/Act workflow is the best piece of process discipline we've seen in an agentic coding tool. The catch is in the name: Cline itself costs $0, but our actual API bill averaged $60-90/month — more than a Cursor Pro or Copilot subscription. "Free" extension, not-free-at-all usage.
Plan/Act: the feature that actually changes how you work
Plan Mode makes Cline draft a full plan — files touched, approach, dependencies it noticed — before it writes a single line. Act Mode then executes it step by step with per-step approval.
We used this to add a full notifications system to a Next.js app. Plan Mode listed a migration, a Prisma model, a service layer, API routes, React components, and real-time updates — and caught a Prisma relation we hadn't accounted for on our own. After approving with one change (WebSockets instead of SSE), Act Mode ran across 11 files, executed the migration, hit two ESLint errors, and fixed them itself. ~8 minutes, three hours of boilerplate saved.
MCP support: context without copy-pasting your schema
We pointed Cline at a Postgres MCP server and asked for "the top 10 customers by lifetime revenue." Instead of guessing at table names, it queried the database, found the right columns, and wrote a correct query on the first attempt — no schema dump required in the chat. The MCP ecosystem (GitHub, Slack, Jira, Notion, Postgres, and more) is still young but growing, and it's the single biggest thing separating Cline from a chatbot with file access.
Browser automation: the sleeper feature
Cline can open Chrome, screenshot your running dev server, reason about what it sees, and iterate. We asked it to "fix the layout issues on the settings page" — it navigated to localhost:3000/settings, screenshotted, spotted a sidebar overlapping the main content on narrow viewports, edited the CSS, and confirmed the fix with another screenshot. About two minutes, one approval. It's visual reasoning, not Selenium — great for layout bugs, useless for testing precise interaction timing.
The actual cost math
Cline the extension is Apache 2.0, genuinely free, no tiers, no cap. Your bill comes entirely from your API provider:
- Claude 3.5 Sonnet: $50-80/month with moderate use — Cline's contexts (files + terminal output + screenshots) are large, so token usage runs high.
- GPT-4o: $30-50/month, cheaper per token, we still preferred Claude on quality.
- Local/DeepSeek: under $10/month, but quality drops noticeably on complex tasks.
Our all-in average: $60-90/month. That's the number that should be in the pitch and usually isn't.
Where it loses
- No inline autocomplete — like Aider, Cline is entirely task-driven. You still need Copilot or Cursor's Tab for passive suggestions.
- Large-context responses can stretch past 20-30 seconds, and we hit rate limits during heavy sessions.
- Extension stability during long browser-automation runs isn't perfect; occasional freezes need a restart.
- MCP setup, API key management, and auto-approval rules mean real configuration time before it runs smoothly.
Who it's actually for
Cline is right if you already pay for API access and want agentic capability without leaving VS Code — full review, including the Cursor/Copilot/Aider head-to-heads and our complete pros/cons breakdown, is on DevTools Review.
We run Cline alongside Copilot: Copilot for inline completions, Cline for multi-step tasks and anything that benefits from terminal execution or browser feedback. That combination has been our most productive VS Code setup.
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