Block all sites except what you allow. Restrict kids to the sites you allow.
https://adepttechnologies.net
https://imagetransformer.xxaix.com/
https://tabsets.web.app/
cory.marcus45
https://sarangak.github.io/yam-allowlist-manager/
eclatronic
angellalfonsoo
https://website-whitelist.com
dorian.band1
kitchenkonverter
Hanabi
https://lenhatthanh.com
