3Somer: This threesome app is likely the most popular download option for those seeking a threesome. Just note that it may take some weeding through profiles to find exactly what you're looking for. You can download Tinder here (free with premium membership options that start at $15 per month). 3Fun: This threesome app is another option for those seeking a threesome. If a threesome app isn't working for you, don't be afraid to look for local fetish or kink-friendly Facebook groups in your area.