CONTROL D is a fully customizable DNS service, similar to Pi-Hole, AdGuard or NextDNS, but with proxy capabilities. This means it not only blocks things (ads, porn, etc), but can also unblock websites and services.
VPN versus Control D
VPN doesn’t support all device
VPN needs an app to install or run
Both Blocks ads and trackers
VPN doesn’t block IP level threats
VPN doesn’t service level blocking
VPN doesn’t do rule scheduling
Both unblock geo-restricted services
VPN doesn’t do number of supported web services
VPN doesn’t no-reconnect service unblocking
Both Can proxy all HTTP(S) traffic
VPN can have high impact on browsing speeds
Both protect activity that doesn’t use DNS
Why internet cookies are almost never all right? 