Cline
Cline is fully open-source and free to install, and it works inside VS Code as a sidebar that reads your entire project before it touches anything. Its Plan/Act workflow lets it explore and propose a plan first, then execute with your approval on every file edit and terminal command, so you stay in control instead of watching a black box. Because you connect your own model provider, you decide how capable and how costly each build session is.
Open VS Code → ExtensionsSearch for 'Cline' and installOpen the Cline panel and add your model API key
Your Engine files go in .clinerules/ — Add your Engine .md files to the repo and put a .clinerules file (or .clinerules/ folder) at the root referencing them.
WHAT OPERATORS USE IT FOR
- • Scaffold a landing page and checkout flow from a plain-English brief
- • Wire up an email opt-in form and connect it to your provider
- • Refactor and fix a page that broke after an edit
Heads up: The extension is free, but the AI itself runs on your own API key, so token usage on bigger jobs becomes a real bill you should watch. It also assumes you're comfortable opening VS Code and approving steps, which is a bit more hands-on than a pure no-code builder.
What Cline is
Cline is an open-source AI coding agent that installs as a sidebar inside VS Code (the free code editor). Instead of just suggesting snippets, it reads your whole project, writes and edits files, runs terminal commands, and can even open a browser to check its own work. It's free to install and released under an open license, so nothing about how it handles your project is hidden.
How it works
Cline uses a two-mode flow. In Plan mode it explores your files and asks clarifying questions before touching anything. In Act mode it carries out the plan, but pauses for your approval on each file change and command. That approval loop is the whole point: you get an autonomous agent that still checks in, so a wrong turn is caught in one click instead of after it has rewritten ten files.
You bring your own model provider, and Cline works with a wide range of them. That means you're never locked to one vendor, but it also means the AI runs on your usage, not a flat monthly seat.
Who it suits
If you're moving from Prompter toward Builder and Operator on the Levels of the Game, Cline is a strong step up. It rewards operators who want to see and control what the agent does, keep everything in a real project folder, and grow into more technical builds over time. It's less of a fit if you want a zero-setup, click-only tool with no editor at all.
Strengths worth knowing
- Open-source and free to install, so you can inspect exactly what it does.
- Lives in an editor you can keep using for everything else.
- Supports MCP and rules files, so it can plug into your tools and follow standing instructions.
Use it with the Engine
Cline shines when you feed it your Engine Context Files: the markdown that spells out your offer, your audience, your voice, and how your pages and funnel should be structured. Save them as a rules file in the project so Cline treats them as ground truth on every task, and it will build pages, content, and flows that match your offer instead of generic defaults. If you want those Context Files done for you, the $1 Starter Kit gives you a ready-to-drop set so you can point Cline at a real plan on day one.
BUILD YOUR OFFER WITH CLINE
Drop your Engine Context Files into the project folder as a .clinerules file so Cline treats your offer, voice, and page structure as version-controlled ground rules on every task. Then work in Plan mode first to agree on the build, switch to Act, and approve each step. The Context Files keep it on-brand across pages instead of you re-explaining the offer every prompt.
The $1 Starter Kit generates the Context Files Cline needs — personalized to your niche.
GET THE $1 STARTER KIT →Install commands change — confirm the latest at the official docs above.