3Fun review

Most mainstream apps treat non-monogamy as a checkbox bolted onto a one-to-one product. 3Fun is built the other way around: threesomes, swinging and open relationships are the whole premise, couple and paired-profile accounts are a first-class option, and the audience opts in for exactly that. It's a real product with a real niche userbase — and it also carries a documented security record that we can't ignore and won't bury.

Who it's for

3Fun is for adults who already know they're looking for threesomes, swinging or non-monogamous connections and want a product where that's the default rather than something to explain. It works for couples browsing together as much as for singles. If you want traditional one-to-one dating, this is the wrong app — and if a past data-exposure incident is a dealbreaker for you given how sensitive this category is, read the safety section below before you sign up.

What it does well

The free tier is the standout. You can match and message without paying, which is rare for a hookup-intent app where the inbox is usually the wall you hit first. First-hand, the app itself is easy to live with: a clean swipe interface familiar to anyone who's used Tinder, working video calls inside matches, broad gender and orientation option sets, and a screenshot-block on profiles so people can't quietly grab your photos. The audience is the other real asset — with millions of downloads and a large active base, it's one of the few apps where the non-monogamy niche has genuine scale instead of a near-empty feed, at least in big cities.

Where it costs you — the security record

This is the part that pulls the score down, and it's the reason 3Fun sits below Feeld on our open-minded list despite a bigger free tier. In 2019, security firm Pen Test Partners published a study finding that 3Fun exposed users' real-time location, photos, date of birth and private chat data — even when users had set their location to be hidden — with the researcher calling it among the worst security he had seen in a dating app. 3Fun stated at the time that it had fixed the flaws. We have not independently re-tested the app's current security, so we treat this as a documented past finding with remediation we can't confirm — not a current live breach, but not a clean bill of health either. In a category this sensitive, an app that handles location, photos and explicit preferences has to clear a higher bar than a mainstream dating app, and a history like this means we grade safety well below the rest of the list and tell you plainly so you can weigh it yourself.

What you'd pay for

3Fun is freemium. The genuinely useful free tier covers matching and messaging, which is enough to judge whether your area has a real pool. The paid tier unlocks instant matching, unlimited likes, messaging before matching, incognito mode and location change — and the upsell prompts surface often. We'd only pay once the free tier has shown there's an active audience near you; in thin markets, paying won't conjure people who aren't there. Watch the auto-renewing subscription terms, as with any app in this category.

The bottom line

3Fun earns a spot on our open-minded list as a real, large, genuinely-free-to-message app for threesomes and non-monogamy — first-hand, it's easy to use and the niche has actual scale. It ranks second, behind Feeld, because Feeld pairs a comparable niche focus with a cleaner record, while 3Fun carries a documented data-exposure history we can't verify as fully resolved. If the free tier shows an active pool near you and you go in with eyes open on the privacy trade-off, it's a usable pick; if a past leak of exactly the data this app holds is a dealbreaker, that's a completely fair reason to choose differently.