I used this to learn Hangul and it was effective. It took me 5,2 hours of study - over a period of 15 days. I wanted to go very slowly and ensure that all the characters truly stuck in my brain. I made sure I achieved gold on all of the practise exercises, and I did each of them at least three times. I am now starting to study Korean directly with my textbooks, and having worked through this application has made that process far easier. I do not struggle to read Korean words and I'm able to study without romanisation at all - which I find immensely helpful for actually adapting to the Korean language. I would highly recommend this application to anyone looking to learn Hangul. It is effective if you take your time and reenforce what you learn with extra reading practise.