The website added a bevy of nontraditional profile options for users to express their gender identity and sexuality in late 2014.

Any adult may join the site and all users may communicate with others via private messages or an instant messaging "chat" function.

Ok Cupid was the first major dating site to offer unlimited messaging free of charge, although this was limited in late 2017 when Ok Cupid's official blog announced the site is "getting rid of open-messaging" and making sent messages invisible to the recipient until they in turn interact with the sender.

Ok Trends, the official blog of Ok Cupid, presents statistical observations from Ok Cupid user interactions, to explore data from the online dating world.

To generate matches, Ok Cupid applies data generated by users' activities on the site, as well as their answers to questions.

On March 31, 2014 any user accessing Ok Cupid from Firefox was presented with a message asking users to boycott the internet browser due to Mozilla Corporation's new CEO Brendan Eich's support of Proposition 8.

Users were asked instead to consider other browsers.

A-List (paying) members see no advertising and have more filtering options and preferential placement in an "A-List Matches" section of search results.

A-list members can also browse openly while choosing whether or not their profile is displayed to those they visited.

Users who receive high ratings may be notified by email that they are in the "top half of Ok Cupid's most attractive users" and "will now see more attractive people in [their] match results".

The email also reads "And, no, we didn't just send this email to everyone on Ok Cupid.

The site used to have a highly active journal/blogging community as well.