From the Guardio browser extension:
To see a list of the websites Guardio has blocked from your desktop browser, visit the Browsing Page of your Dashboard. You'll initially find the site names redacted for your privacy; however, you can reveal the full names by clicking on the eye next to "source" at the top of the blocked site list.
Note: The sites listed here are the sites Guardio has blocked for you on desktop only.
From the mobile app:
To see a list of the websites Guardio has blocked from your mobile browser, tap on the Browsing Protection tab. To see the URL for each of these sites, simply tap on the arrow next to the “Blocked website” text.
Note: The sites listed here are the sites Guardio has blocked for you on mobile only.