

The app also works for Spanish speakers who want to learn Catalan, or French speakers who want to learn German, for example. You don't even have to speak English to use it. One of the great things about Duolingo is that it has made language learning accessible to everyone.

It's by far the most popular language learning program for smartphones and is used by 300 million people all over the world. If you've ever searched for language learning apps to use on your smartphone, you've almost certainly come across Duolingo.
