Leaf VPN is the easiest unlimited free VPN app that just works.
It's a VPN app uses the VpnService, thus requires the VPN permission to establish a VPN tunnel to our VPN servers.
In addition to the free 1-tap-to-go free VPN service, we also provide premium service for users who have a subscription, we provide the most affordable pricing plans, make sure try one of them if the free service doesn't meet your needs:
1 Week Subscription at $0.49
1 Month Subscription at $0.99
Leaf VPN supports Windows and macOS: https://www.kitslabs.com/leafvpn.downloads.html