Babel is an Android app that offers extensive courses in 13 languages. This app includes entertaining listening, writing, and speaking exercises.
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Pro Offers explanations
When you aren't sure about tricky grammar, Babbel can refresh your memory.
Pro Thorough courses
Each course contains four stages: new words, a dialogue, grammar instruction, and review.
Pro High quality content
Since the content isn't user generated like other apps, each lesson is extremely high quality.
Con Monthly fee
This app costs $13 per month