| Ashley Madison | Members are matched up with other married adult members based on profiles. | 700717815000000000017,815,000[1] | 70032269000000000002,269[2] | Partial | Yes/No; Free users can view profiles and respond to contact but cannot initiate contact. Paid users have added benefits. | Yes | AshleyMadison.com | Non-free |
| Chemistry.com | A sister site of Match.com, members are matched up with other members based on their profiles. | 700711000000000000011,000,000[3] | 70037355000000000007,355[4] | Partial | Yes/No; users can see 5 matches a day unless they are paid members | Yes | chemistry.com | Non-free |
| Compatible Partners | eHarmony's service for same-sex relationships. | | 7005321393000000000321,393[5] | No | Non-free | Yes | compatiblepartners.net | Non-free |
| DateMySchool | Only site dedicated to verified college students and alumni (via education database). Focuses on privacy and safety. Can block by departments and schools. Members only see intersection of what they are looking for and what other members are looking for. | 7005179000000000000179,000[6] | 700496998000000000096,998[7] | Partial | Yes/No; All users can view profiles. Free messaging and status posting for undergraduates (5 messages/day limit). Alumni cannot initiate or respond to contact or post status updates. All Paid users can message and post and they also have added benefits. | Yes | DateMySchool.com | Partial |
| eHarmony | Dating site based upon pre-screening using personality tests. | unknown | 70032169000000000002,169[8] | No | Yes/No; free profile but subscription required for most features. | No; Redirects gay and lesbian people to Compatible Partners, their same-sex dating service.[9] | eharmony.com | Non-free |
| Gaydar | Profile-based dating website for gay and bisexual men, women, and couples. | | 70038638000000000008,638[10] | | | Yes | gaydar.co.uk | |
| GayRomeo / PlanetRomeo | Worldwide social network, instant messaging and dating community for gay, bisexual and transgender men. | 70066740000000000006,740,000 registered and 70061107000000000001,107,000 active (last 6 weeks)[11] | 70031488000000000001,488[12] | Free: communication, profile and picture views, search engine | Yes: video downloads, higher database limits, deactivation of advertising | Yes | gayromeo.com planetromeo.com | Free |
| Gleeden | Social network, instant messaging and dating community for extra-marital relationships. | unknown | 700429473000000000029,473[13] | No: Costs credits to send and read messages unlimited about of times to one user | Yes: Higher database limits, deactivation of advertising | Yes | gleeden.com | |
| Lavalife | One of the oldest dating companies in the world.[14] | | 700423965000000000023,965[15] | No | Yes | Yes | lavalife.com | |
| Lovestruck.com | Online dating for single professionals in UK, Hong Kong and Singapore | 7005300000000000000300,000 registered[16] | 700479965000000000079,965[17] | No | Yes | Yes | lovestruck.com | Non-free |
| Mamba | Social-network-like dating site, primarily CIS/former Soviet Union, but some international presence. Primary language is Russian, but all languages welcome (and searchable). Caters to all audiences. | 700711673451000000011,673,451[18] | 70031325000000000001,325[19] for named portal; also 3-5% of mail.ru (#31) and rambler.ru (#191), which offer access to the same services and communication with the entire user pool through love.mail.ru and love.rambler.ru subdomains | Free: communication, profile and picture views, simpler engine, blogs | Yes: Premium content like additional search criteria and double appearances in others' relevant searches for "VIP membership". Single payments for regional advertising of profile (one-time appearance in scrolling banner for $1 - user picture, link, short text for mouseover; bidding war for stationary second banner + cost of $1/minute). | Yes | Mamba.ru | Free |
| Marital affair | Based on user profiles, users are matched up to other married members. | 7005675000000000000675,000[20] | 7005107206000000000107,206[21] | Partial | Yes/No; Free users can view profiles and respond to contact but cannot initiate contact. Paid users have added benefits. | Yes | MaritalAffair.co.uk | Non-free |
| Match.com | One of the biggest online singles meeting sites | 700796000000000000096,000,000 registered;[22] 1,377,000 active (2009)[23] | 7002407000000000000407[24] | No | Yes | Yes | match.com | Non-free |
| Matchmaker.com | Dating service founded in 1986, making it the oldest of the current online dating sites. | | 700450177000000000050,177[25] | | | Yes | matchmaker.com | |
| Meetic | One of the biggest online singles meeting sites; N.1 in Europe (in June 2009, Meetic acquired Match.com's European activities) | 700742000000000000042,000,000 registered[26] | 700412285000000000012,285[27] | No | Yes | Yes | meetic.com | |
| MiuMeet | A mobile social dating network | 70063000000000000003,000,000 registered[28] | 7005103298000000000103,298[29] | Free | Yes/No; While it is free to use, MiuMeet offers premium services as part of their upgraded membership, such as seeing all users that viewed your profile and allowing you to see whether a user read your message.[30] | Yes | MiuMeet.com | Free |
| OkCupid | Uses answers from user-generated questions to find matches that conform to a user's stated preferences. | 70065600000000000005,600,000+ active (as of 2010)[31] | 7002676000000000000676[32] | Free | Yes/No; Free to join, search, messaging, and chat. Non essential features like sponsored profile promotion available for paid "A-List" members.[33][34] | Yes | okcupid.com | Free |
| Parship | Dating site for people looking for a long-term relationship, using a personality test. Available in Europe and Mexico. | | 7005440756000000000440,756[35] | Partial | Yes/No; free profile but subscription required for most features. | Yes | parship.com | |
| Passions Network | A free personalized dating and social networking website, consisting of over 200 niche sites. | 70062700000000000002,700,000[36] | 7005765249000000000765,249[37] | Free | No | Yes | passionsnetwork.com | Free |
| Perfectmatch.com | This dating website is using complex heuristic algorithms for finding matches. | | 700480785000000000080,785[38] | No | Non-free | Yes | Perfectmatch.com.com | Non-free |
| PlentyofFish (POF) | One of the most popular dating sites United States, Canada, United Kingdom and Brazil | 700740000000000000040,000,000 registered[39] | 7002291000000000000291[40] | Free | Yes/No; While it is free to use, POF offers premium services as part of their upgraded membership, such as seeing the date and time a user viewed your profile and allowing you to see whether a user read and/or deleted your message.[41] | Yes | pof.com | Free |
| ShakeMyWorld | Swedish. Listed as one of the top 100 Swedish web sites of 2008.[42] | | 7005328131000000000328,131[43] | No | Non-freeBased on user creating activities. | No | shakemyworld.com | |
| SpeedDate.com | Online speed dating site, where users meet via text, audio, and video chat | 70069000000000000009,000,000 registered[44] | 70033852000000000003,852[45] | Partial | Premium users can continue communicating after unlimited free speed dates | Yes | speeddate.com | |
| Spray Date | Run by Spray Network AB | | No data | Partial | Premium users can see larger images and have more search options | Yes | spraydate.se | |
| Tastebuds.fm | Free dating site which matches people based on their tastes in music | unknown | 7005192677000000000192,677[46] | Free | | Yes | tastebuds.fm | Free |
| True.com | Known for running background checks on its users to ensure they are not felons or married. | | 70039922000000000009,922[47] | No | Yes/No; Monthly subscription fee for communicating to other members. Searching and viewing partial profiles is included with free account like most dating sites. | Yes | true.com | |
| Zoosk | Known for large international user base[48] and integration with Facebook community.[49] | 700750000000000000050,000,000[50] | 7002886000000000000886[51] | No | Yes/No; Searching and viewing partial profiles is included with free account like most dating sites, fee or monthly subscription for full communication with other members.[52] | Yes | zoosk.com | |
