Sadly, this app isn't a type of bike which works in sync with your mobile. Instead it's a language learning tool which allows you to practice any language, at any time, with people from around the world who share your interests - It's a bit like Tinder but for linguists. There's three key points to Tandem, firstly you can use the app to 'immerse' yourself in a language. It's designed to teach you what you need to know in real life situations. The second is that it's a stress-free way to quickly meet amazing 'Tandem partners'. These partners are basically just other people learning either the same language as you or they may be learning your language so will have real life conversations with you to fast-track your learning. And finally, the app takes a bit of a relaxed approach in how you learn. Tandem is all about having fun while developing a new language. The languages on Tandem so far are English, Spanish, French, German, Portuguese, Japanese and Chinese. And with more than 300,000 active learners across the app, you can never go too far without getting some form of support.