Typically, the "g-loaded" composite score of an IQ test battery appears to involve a common strength in abstract reasoning across the test's item content.
Though the app doesn't require any sort of proof that you're an intelligent person (i.e., information about your college degree, or an IQ score), it remains to be seen whether your chances of meeting someone of a certain intelligence level would be any different here than on, say, Ok Cupid, where you can also make matches based on answers from questionnaires.
Scores from intelligence tests are estimates of intelligence.
Unlike, for example, distance and mass, a concrete measure of intelligence cannot be achieved given the abstract nature of the concept of "intelligence".
If you think of yourself as a sapiosexual, this is the dating app for you.
Aptly dubbed "Sapio," the app makes matches based on intelligence, and amongst other things, allows users to define themselves as sapiosexual, or someone who finds intelligence the most sexually attractive feature.