" Preply is an online educational platform that pairs students with private tutors remotely via online chat. It features a ranking algorithm that uses machine learning for classification and recommendation of tutors. " Taken from Wikipedia Essentially it's a platform where a student learning a langauge can browse and select a tutor based on price, experience, dialect and whatever other factors are important.

You can find some really good priced tutors on Preply. I studied with a Mandarin teacher for just 3.65GBP for an hour - excellent value.

Are there group classes on Preply?

Yes, there are now group classes on Preply.

Are there many tutors available on Preply?

A great feature of Preply is simply the sheer mass of tutors available. There are so many and because of that you can get some excellent prices. You can use the filters to narrow down your options with criteria like price, languages spoken and time available.