OptimalConnect is a DNS changer & optimizer
Supports IPv6 DNS
Features:
-Finds and connects to an optimal DNS. But you should remember that DNS settings will not affect your internet download/upload speed but ping.
-DNS changer
-Turn off/on other applications internet connection.

OptimalConnect uses VPN service permission and VPNService base class in Android for these features:
-Creating DNS connection.
-Changing DNS with an optimal DNS based on ping.