eHarmony

It is estimated that about 20% of eHarmony applicants are rejected.[22] In 2007, eHarmony stated since the site's launch, they had rejected about a million people who applied to use the service. They reported that about 30% of those applicants were denied because they were already married, 27% were younger than the minimum application age of 21, and 9% provided inconsistent answers on the application. eHarmony also stated they reject anyone under the age of 60 who has been married more than four times, or who fails their "dysthymia scale", testing as having a depressed disposition.[23]

When it began, eHarmony did not offer same-sex matches; however from 2009 through 2019 the company provided service through a separate platform, Compatible Partners.[24] Warren said that he had done extensive research on heterosexual marriage but did not know enough about homosexual relationships to do same-sex match-making, which he said "calls for some very careful thinking. Very careful research."[24] He also said that eHarmony promotes heterosexual marriage, adding that (at the time) same-sex marriage was illegal in most places, saying "We don't really want to participate in something that's illegal."[24] In another interview, Warren went into more detail on his own views, noting that "cities like San Francisco, Chicago or New York... they could shut [eHarmony] down so fast. We don't want to make enemies out of them. But at the same time, I take a real strong stand against same-sex marriage, anywhere that I can comment on it."[25]

eHarmony's lack of same-sex matching options prompted lawsuits claiming that eHarmony violated laws prohibiting discrimination on the basis of sexual orientation.[26] As part of the settlement of a New Jersey case,[27] eHarmony launched a partner website called Compatible Partners providing match-making "for men and women looking for a serious same-sex relationship".[28] Theodore B. Olson, an attorney for eHarmony, said that even though the company believed the complaint was "an unfair characterization of our business", it chose to settle because of the unpredictable nature of litigation.[29] In 2010, eHarmony settled a separate class-action lawsuit filed in California that alleged illegal discrimination based on sexual orientation. The company agreed to allow access to both its gay and straight dating sites with a single subscription, to display its gay dating services more prominently and to establish a settlement fund to pay people who can show they were harmed by the company's policies.[30][31]

As of 2013, about 200,000 people had registered with Compatible Partners.[32] Michelle Garcia, writing in the LGBT-interest magazine The Advocate, also said that, like eHarmony, Compatible Partners attracts high-quality customers. According to Garcia, "Because of the price tag and the emphasis on long-term relationships... Compatible Partners' users are seen as quite desirable."[32]

In 2021, eHarmony released an advertisement that included a same-sex couple, emphasizing the platform's diverse user base.[33] Nevertheless, certain conservative groups expressed criticism, suggesting the platform deviated from its Christian roots.[34]

After approval by the questionnaire, eHarmony begins to match members regardless of their subscription status. A member's list of matches does not indicate which members are paying or non-paying, so users may not be able to communicate with all of their matches.[35]

On June 6, 2012, eHarmony confirmed that its password database had been breached and a section of its user base had been affected.[36][37] Affected members were sent e-mails by the company requesting them to change their password immediately.[38]

A 2010 article published by the Harvard Business Review attributed the success of eHarmony's system to their large membership base, their efforts to exclude people who are not serious about dating, and their membership fees being more expensive than the fees for other dating websites. The author hypothesizes that, since eHarmony's questionnaire and high cost of membership deter people who are interested in casual dating, eHarmony's members are more likely to be interested in a long-term relationship.[39]

A 2012 analysis of dating websites by Scientific American stated that eHarmony, along with other algorithm-based dating sites, had not yet provided members of the scientific community with information about their matching algorithm which could be used to vet their claims about their algorithms being scientifically based.[6]

In 2014, eHarmony was criticized by the National Advertising Division of the Better Business Bureau over claims the company had made about their rates of success. This occurred after Match.com challenged claims made by eHarmony about the two companies' relative success.[40]

In 2018, the Advertising Standards Authority stated that an eHarmony ad which included the lines, "It's time science had a go at love", and "Imagine being able to stack the odds of finding lasting love entirely in your favor", was misleading. When the ASA asked for evidence supporting eHarmony's claims that their scientifically proven matching system increases the odds of finding love, eHarmony was not able to provide any.[41] The ASA subsequently banned advertisements that claimed the use of a scientifically proven matching system. eHarmony publicly disagreed with the ASA but said it would work with them to clarify its advertising.[42]