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If you have a very specific set of interests, there are many sites that may cater to your niche.
Some of these niche sites are Farmersonly.com, Millionaire Match.com, Geek2Geek.com, JDate, Dandy, Pinksofa.com, Christian Mingle and Positive Singles.
Zoosk is a singles dating app that uses a behavioral matchmaking engine to pair users who its system indicates will be a good match.
The app is available in over 80 countries and has over 27 million searchable members.
Bumble is a dating app that only allows women to initiate contact in opposite-sex connections; in same-sex connections either party may initiate contact. OKCupid is one of the most popular dating sites and is free to sign up initially.