Millions of single people are signed up to an array of dating websites, apps and introductory services that we trust to find us our 'perfect match'.

But many are extremely costly and - as was recently highlighted in complaints about by eHarmony - some of their claims are not quite credible.

Telegraph Money has previously called on dating services to be publish statistics about their users to enable customers to understand how likely they will get a match based on their requirements. The widespread suspicion is that many sites have more women on their books than men. Few sites, however, are upfront about this.

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Earlier this month eHarmony, the online dating giant, has had its 'scientifically proven matching system' claims dismissed as nothing more than 'fake news' and had one of its adverts banned after the Advertising Standards Agency decided it was misleading. How do other sites claim to match up users - and how much you could end up paying in your quest for love?

Match.com

One of the biggest dating sites it boasts three million UK users.

It says it tries to 'keep science out of it' so people can 'find their own chemistry'.

Algorithms, formulas used to solve problems (in this case love matches), are not a key selling point of the service, it claims, although it does use several.

Users set their preferences, such as age, gender, hobbies, location, and can proactively search for like-minded individuals. Match.com will also suggest potential love-interests.

Your online behaviour is also taken into account. For example, Match.com will monitor the time you log on and recommend people who are also online at that time.

Match.com also organises events where members can meet and see if they hit it off in real life.

Cost: £29.99 a month, £19.99 a month for three months or £9.99 a month if you choose a six month subscription.

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eHarmony

eHarmony, which has recently come under fire for its claims that it uses science to match compatible individuals, asks users to fill out a lengthy and detailed questionnaire to 'determine their core personality traits and values and help determine who they are and what they're looking for', according to the site.

This information is then run through its system to find you compatible matches.

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eHarmony's website is teeming with academic references.

It says it was founded by Dr Neil Clark Warren, a clinical psychologist and marriage counsellor who's spent more than 35 years applying scientific methods to relationships to find out what makes them last.

On the website it also explains how it has worked with a department at Oxford University to research what personality traits affect compatibility.

This week the ASA banned a billboard advert on the London underground in the summer because it felt it was misleading.

Lord Lipsey, who lodged the complaint and is joint chairman of the All Party Parliamentary Group on Statistics and a former lay member of the ASA's council, said: 'Phrases like 'scientifically proven' should be confined to claims that are just that, not used in crude puffery designed to lure in those longing for love.

'This is a new form of fake news which the ASA has rightly slapped down.'

The ASA said that 'consumers would interpret the claim 'scientifically proven matching system' to mean that scientific studies had demonstrated that the website offered users a significantly greater chance of finding lasting love than what could be achieved if they didn't use the service.'

It said there was no evidence to support this claim and said eHarmony cannot use this wording again.

Cost: £39.95 for a month with prices descreasing over longer subscription plans

Mysinglefriend

Co-founded by TV presenter Sarah Beeney in 2004, Mysinglefriend offers a 'no nonsense' approach to dating.

At the time it was unique. People looking for romance could rope in a mate to write their profile for them to take away the awkwardness of selling yourself in the name of love.

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That doesn't seem to be the case anymore. On the website it says you can choose a username and set up your own profile.

Mysinglefriend has a search function. You specify what you're looking for in terms of gender, age and location, in the 'quick search' form, click go and you're off.

There's a more advanced search option where you can find the most popular profiles, those who've added photos recently and users who are online.

Cost: You can sign up for free but you have to pay if you want to respond to write personal messages to other users. The subscription costs £28 for a month, £18 a month for three months, £13.33 a month for six months, 10.50 a month for 12 months. A 'premium' prescription costs an extra £10 a month which means everyone you message can respond for free.

Happn

Happn, a dating app, is purely based on users who you pass on the street. So it's essentially luck.

It uses the location of your phone to show you individuals who've also been in the area, how many times your paths have crossed and at what time of day.

Their profiles then appear on your app and it's up to you whether you decide to send them a secret 'like'. If they like you, you've got a match.

Creepy? Maybe.

But Happn says it never reveals your exact location - it's approximate - and it promises you won't receive messages from people you don't like the look of.

Cost: Starts at £19.99 for a month but gets cheaper if you subscribe for longer periods. This gives you 10 credits a day. One credit can be used to send a notification to the other user.

OkCupid

OkCupid's website claims that it works its 'algorithm magic to find people you'll actually like'.

It talks a lot about 'math' to reassure singletons that it's making furious calculations to find their dream partner.

Under a section titled 'Math in the name of Love' it says: 'You should see the work that goes into this bad boy. Algorithms, formulas, heuristics – we do a lot of crazy math stuff to help people connect faster.'

Nobody from OkCupid was able to explain in more detail how this 'math' really worked.

Cost: Free

Soulmates

One of the oldest sites, the Guardian's dating site claims to connect individuals of 'all ages, backgrounds and sexual orientation.'

All profiles on the Guardian's dating site are verified and monitored by staff in the UK.

You can sign up for free and have a browse but if you see someone you like, you've got to pay to contact them.

Once you've joined your profile will appear on search pages and will be sent to other users who you match.

Your photo could also appear on the Guardian website, for extra reach.

Cost: £32 a month, £64 for three months or £96 for six months

Tinder and Bumble

Both of these free dating apps ask users to enter a number of preferences.

If two users says they are both looking for lovers between the ages of 30 and 35 in a 10 mile radius, they'll end up in the same 'swipe' queue.

You then decide whether you like the look of the suggested matches. Users swipe right if they're interested and left if they're not. If you both swipe right you've got yourself a match and can start messaging.

On Bumble, women have to make the first move.

Cost: Free

I use dating websites - will these algorithms find me 'the one'?

Not according to academics - so be careful when parting with your cash.

Nicky Danino, principal lecturer in computing at the University of Central Lancashire, said that while the online dating industry is making use of sophisticated technology, such as ' complex algorithms' and GPS software, it can't measure the things that often matter the most, such as the 'quality of interaction' between you and another person.

Ms Danino said: 'The idea that there are ‘advanced algorithms’ is playing with words. Yes, they can often allow you to place a different weighting on the things you want like looks or money. But it can be almost impossible for these algorithms to judge and match up to your expectations.'

Ms Danino added that users of dating sites are asked to judge themselves in order to provide data for the algorithm to use - and what we think about ourselves is not always accurate.

In May last year experts at Kings College and Oxford University said they were concerned that dating websites could not recreate the serendipitous attraction that two people who have ostensibly nothing in common can feel when they come together.

And a recent study, published last August, echoed this. It suggested that good relationships are not born out of complex algorithms because attraction is unpredictable.

The study found that while the computer-based algorithms could match up people with similar preferences they can't predict what sparks desire.