Very limited exercises, focused only for western/latin-based languages. If you're looking for an app to help learn Chinese, Japanese, Korean or other non-western languages, then this is a BAD choice. There is NO grammar lesson at all for ANY languages. No spaced-repetition review. No character writing exercise, which is crucial to learn any languages with different characters than westerns'. Exercises are repetitive and boring. Most of them require you to TYPE long sentences. Lots of ads!