Flash Fluency: Korean

Flash Fluency is a Korean-learning app built around personalized, level-appropriate practice. It combines vocabulary and grammar lessons with reading, listening, pronunciation, recall, and sentence-building exercises, using spaced repetition to reinforce what you learn.

A particularly useful feature for Korean learners is detailed pronunciation feedback that identifies problems at the individual sound and syllable level rather than simply marking pronunciation right or wrong. The app also tracks vocabulary and grammar proficiency to adapt exercises to your level.

Flash Fluency includes thousands of vocabulary lessons, 300+ grammar lessons, 100+ vocabulary topics, and instruction covering Korean pronunciation and sound-change rules. It is available on iOS and Android, with a free tier and optional paid plans.