Pros: Free to join and to have limited contact with members.

e Harmony is another massive player, with 3 million users signed up.

But size isn’t everything – as anyone who has just wrapped up a three-hour swiping session on Tinder will attest.

Cons: The lengthy survey you must complete before you sign up.

It is 100s of questions long and asks many probing questions about religion and moral views.

However, they do have a live help service at their homepage to talk you through joining.

Pros: Uses compatibility testing to match you with someone who shares the same worldview as you.

But too many filters and rigid check-boxes can have you dismiss huge numbers of people at once – something that apps like Bumble, Happn and Tinder tried to do away with (though that brings its own set of issues).

One 5ft 10in friend reports she saw only 400 potential men to browse when she logged in to

The price and process mean only the dedicated remain – but equally, can lead to people dropping out mid-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.

Too many members with no filter can result in either hours of swiping to find someone you fancy, or hundreds of messages in your inbox that you’ll never have time to read.