Hi, we offer all of the filtering options free of charge as a way to try out FoxFilter. In order help cover our expenses, we do charge a very minimal annual fee of $12.99, which we feel is very affordable. We are equally frustrated about Google Android only selectively supporting approximately 200 Chrome extensions for some reason, even though all Chrome extensions were installable on Android at one point. Feel free to reach out to us at foxfilter@inspiredeffect.com to discuss this more. Best regards, FoxFilter Team