Private alpha access

Drop your email and we'll send the invite when it is ready. Invites go out by hand, one at a time.

By joining, your email is sent to our email provider (Substack) to manage the waitlist. Your GitHub handle is not sent to them. See our Privacy Policy.

We'll also notify you when Extension.dev reaches general availability. No spam, two emails per quarter at most.

Start building right away

Scaffold locally with npx extension@latest create.

javascriptpreactreactsveltetypescriptvue
Browse templates

Built for developers.Ready for their agents.

Build, preview, and ship cross-browser extensions from GitHub, the console, or an agent.

docs.extension.dev

Platform details

Links and updates

The skill
Knowledge for your agents
The MCP
Extension tooling for agents
The pricing
Plans and the free allowance