Memrise offers user-generated content on a wide range of other subjects. The Memrise app has courses in 16 languages and its combinations, while the website has a great many more languages available.
Memrise was founded by Ed Cooke, a Grand Master of Memory, and Greg Detre, a Princeton neuroscientist specializing in the science of memory and forgetting. The website launched in private beta after winning the Princeton Entrepreneurship Club 2009 TigerLaunch competition.
Memrise is funded by 12 investors: Korelya Capital, Balderton Capital, Avalon Ventures, Octopus Ventures, Future Fifty, and others.
Memrise makes language studying a game, like its competitor Duolingo. Memrise uses spaced repetition to accelerate language acquisition. Spaced repetition is an evidence-based learning technique that incorporates increasing intervals of time between subsequent reviews of previously learned material to exploit the psychological spacing effect. The use of spaced repetition has been shown to increase the rate of memorization.
Although the principle is useful in many contexts, spaced repetition is commonly applied in contexts in which a learner must acquire a large number of items and retain them indefinitely in memory. It is, therefore, well suited for the problem of vocabulary acquisition in the course of second language learning, due to the size of the target language's inventory of open-class words.
According to en.wikipedia.org