And with so much choice, choosing on the right one for you can be a tough job, as can finding one to suit your budget - but how much should you spend on your quest for love?
Here are 10 of the biggest websites in the UK and how much they cost a month.
UK members: 3 million Top features: Advanced 'smart search' which allows you to filter matches by location and personality traits.
Price per month: £29.99 Website: members: 3 million Top features: Complete their free affinity questionnaire and you'll be matched with compatible and like-minded members.
Inbuilt personalised location features, and weekly dating tips, to help you find that special someone.
Price per month: £14.95, a month or £9.98 a month when you subscribe for 3 months. Website: UK members: 27 million Top features: Inbuilt behavioural matchmaking engine which learns as you click to pair you with singles you're likely to be mutually attracted to.
Price per month: £44.95 per month or £11.95 per month for a 12 month membership Website: members: 475,000 Top features: Personality profile based on the ''Big Five'' personality models - gender, age, residence, profession and level of education to help create long term relationships.
Price per month: £79.95 a month or £19.95 a month when you subscribe for 12 months Website: UK members: 370,000 Top features: Lovestruck.com's behavioural recommendation engine assesses your search history, like page views, winks and favourites to help you find what you're actually looking for - and not what you say you're looking for.