Out of all the apps I’ve downloaded to study korean, this one is the best. It’s repetitive (which is good) and feels like a game, so it’s fun and enjoyable to use InfiniteKorean and study korean. I’ve found that the sound only works when I use earbuds, which is fine, but I’d still like to be able to charge my phone without earbuds and still be able to hear the sound. I like how it doesn’t show premium membership rewards until you buy it. My only concern is that, for the numbers section, it only teaches you 0-12 in Pure-Korean numbers only, not sino-korean. However, I’m not sure if you get more numbers with the membership upgrade, so it could be just that I’m using the free version. Overall, it’s a fun and helpful app for learning simple vocabulary words. Also, I like how it’s completely free and doesn’t limit your time. Thank you, Infinite Korean, very cool.