OkCupid is the fastest-growing online dating site. Using math to get you dates, OkCupid utilises special matching algorythms to find someone who claims to fulfill your claimed requirements, exactly. It is completely free. OkCupid is developed in C++ and run it on OKWS, our web server. OkCupid team programs front-end code (HTML, CSS, JS, etc.) in OkPub, a templating language. While OkCupid isn�t open source, OKWS and OkPub are both actively maintained and freely available under a GPL license.