1. Connect
Your API key never reaches this tool's server, ever.
- Used only to call Google's Chrome UX Report API directly from your browser.
- Remembered locally in this browser only (via localStorage) so you don't have to retype it each visit — it isn't synced, shared across browsers/devices, or visible to anyone else using this tool.
- Google's own CrUX API docs note these keys are safe to embed in URLs — they're free-tier, rate-limited, and can't touch billing or other Cloud resources, a different risk class than a typical secret credential.
- Using "Save to server & get link" only sends the finished report and the list of domains you compared — your key is never part of that request.
- Use "Forget key" below any time to remove it from this browser.
Don't have one? Enable the "Chrome UX Report API" in a Google Cloud project, then create an API key under Credentials — see Google's CrUX API documentation for the full walkthrough.
2. Choose sites
One per line: Display Name, domain.com. Paste a full URL and only the domain is used — this compares whole-origin traffic, not individual pages. Up to 20 domains per run.