Chrome Extension Kit

PRIVATE TEMPLATE

Sell your paid Chrome extension without rebuilding the billing stack.

Chrome Extension Kit is a private monorepo template for developers who want a faster path from extension idea to paid product. It brings together a Manifest V3 starter, Polar-ready checkout, Cloudflare Worker licensing, and an Astro landing page.

Buy for $29 See included code

WHAT YOU GET

A practical starter for monetized extension projects.

Manifest V3 extension

Popup, options page, activation flow, local entitlement cache, and premium-state wiring.

Cloudflare Worker API

License activation, validation, deactivation, signed entitlement responses, and webhook handling.

Astro landing page

A product page, checkout links, docs hooks, and deployment settings ready to customize.

Guided setup docs

Local mock billing, signing keys, Chrome Web Store notes, Cloudflare deployment, and pricing copy.

FLOW

Built around the first paid version, not a theoretical platform.

  1. Connect Polar.sh credentials and required custom fields.
  2. Set Cloudflare Worker environment variables and D1/KV storage.
  3. Customize the extension copy, colors, and premium feature gate.
  4. Load the extension locally, test purchases, then publish.

PRICE

Private repository access for $29.

Purchase through Polar.sh. After payment, the Worker reads your Polar checkout custom fields and invites your GitHub account to the private template repository.

$29

One-time access to the private Chrome Extension Kit template repository.

Polar checkout will ask for your GitHub username. Use the account that should receive private repository access.

LICENSING NOTE

The template stays private.

You can use the template to build and sell your own Chrome extension. The $29 plan does not include permission to republish, resell, or make the template repository or its derivatives public.