While the title promises mastery in 21 days, here is how the experience usually unfolds for learners:

Users on Reddit have noted it is a "brilliantly set up" supplemental piece that helps you feel "accessible" to the language within days.

Excellent for those who studied German years ago and need to quickly "re-activate" their dormant vocabulary.

The first chapter is dedicated entirely to phonetic rules, which is crucial for German’s unique sounds. The "Interesting" Reality Check