However, perhaps controversially, arguably this is more of a pro than a con – as the saying goes, opposites attract!
And there’s no sense in ruling someone out for reasons that may become insignificant once you’ve met in real life.
It’s a softly, softly approach – excellent for those new to internet dating or nervous about entering the melee, or using a fast-food dating app like Tinder.
Cons: The lengthy survey you must complete before you sign up.
It seems unavoidable that if we have filters and tick-boxes for features and likes or dislikes, we could be cutting off literally thousands of potential suitors because of something we might have thought minor or irrelevant if we met in the flesh.
Pricier – it’s £44.95 for a month, but that drops to £12.95 per month if you sign up for a year.
You can’t browse pictures or profiles – you wait to be matched by the mystery algorithm after answering the 400 questions – then you are guided through a contact process.
Controversy swirled in 2010 around its lack of same-sex matching resulting in a site launched later for gay and bisexual daters called Compatible Partners, but e Harmony now offers matching for both mixed and same sex couples from the main homepage.
Pros: Free to join and to have limited contact with members.