Duolingo is a free language learning app that is fun and simple to use. Duolingo is designed like a game making it an excellent tool for visual learners. Duolingo users set personal goals, track their progress and are awarded for completing lessons. The app allows you to select your first language and the language you want to learn. The reviews of Duolingo remind that it is an excellent language learning tool to use in combination with other resources that strengthen conversation skills.