AMPInspect

This plugin displays a brief overview of websites using AMP (Accelerated Mobile Pages).

For WordPress websites it will list if the official plugin has been installed (regardless if whether it's activated), and also lists whether the most popular non official AMP plugin has been installed. It display's this information on both AMP and non AMP WordPress URLs.

For the official AMP plugin it will display the plugin version and mode when you visit an AMP page.

For any AMP URL (WordPress or not) the popup lists the AMP components active on that page.