Dating advice 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. How do other sites claim to match up users - and how much you could end up paying in your quest for love?
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. How to stay safe online - for adults By psychologist Emma Kenny Users set their preferences, such as age, gender, hobbies, location, and can proactively search for like-minded individuals.
Your online behaviour is also taken into account. This information is then run through its system to find you compatible matches. 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. 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. 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. Make me a match: Tinder Mysinglefriend has a search function. 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.
You can sign up for free but you have to pay if you want to respond to write personal messages to other users. Happn Happn, a dating app, is purely based on users who you pass on the street. So it's essentially luck. 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. 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.
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.
Would you trust a dating site's algorithm to find you your perfect match? OkCupid Under a section titled "Math in the name of Love" it says: Algorithms, formulas, heuristics — we do a lot of crazy math stuff to help people connect faster.
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. 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. Is an algorithm the key to love?
Getty Images 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. The study found that while the computer-based algorithms could match up people with similar preferences they can't predict what sparks desire.