Her service is exactly what the title suggests: You have to know someone who knows her.
Clients are by referral only; you're ostensibly introduced to a potential mate by someone you know.
Some apps provide some information, but others provide literally nothing and there is no search feature.
On the other hand, dating sites are often overloaded with information that you can obsess over.
It's kind of old-fashioned, but that's what I liked about it.