This is borderline turning into the other useless thread... just a debate about what is legal and what isn't.
Do you guys know for a fact it's illegal? Are you guys lawyers? What do you think the people who will be using this app will do with their recordings? Do you think they will blackmail someone? Use it as evidence in court? If it's illegal, are you going to call the FBI on the person recording the call, and tell them they are using legal software to illegally record phone calls? If you call me and I tell you I'm recording the conversation, is it still illegal? If I don't tell you, is it illegal? Are you going to sue me? Are you going to tell me "I told you so" if it is really illegal? Can I tell you "I told you so" if it isn't?
(Hopefully) most everyone here is a grown adult, and can account for their own actions and consequences. But come on, don't blurt out this is illegal when you don't know what you're talking about. If you do, then give reasons why, and back your statements up with facts! Otherwise,
DROP THE LEGALITY DISCUSSION!!