SightSpeed brings you the world's best video and voice calling service for both Macs and PCs.Make free video calls, PC-to-PC voice calls, or simply make and receive calls to and from regular telephones. Smooth, natural video with no delay. Mac users can connect with full quality to Windows users, and vice versa. Create and send video mails to anyone with an email address. Have multi-party video calls with up to 4 people at a time. Have a video or voice call with anyone, even non-SightSpeed users.