We measure what stays
A count of items answered only measures time spent sitting down. What we count is how often you get an item right when you meet it again after a gap — and that is where most of your XP comes from.
About
The courses and questions cost nothing
Our 30 courses and 43,528 questions are free. What costs money: an optional subscription for extras, one-to-one lessons with a teacher, and courses an instructor opens.
How it works
Three steps, and you cannot skip one.
- 1You read
Text, tables, audio and video in one flow. Drag over any line to highlight it, add a note, hear it, or look a word up.
- 2You try it
Type into the blank, press Enter, and it is marked on the spot. Typos are told apart from real mistakes, and a miss tells you where to look again — never the answer itself.
- 3Clear 80% and the next day opens
Your last answer on each item is the one that counts. So going back, rereading and retrying actually moves your score.
What is different here
Not a feature list — three things we decided differently.
We name your weak spot
“Writing 62%” is report-card language. Here it says “은/는 after a final consonant”, with a button next to it that gives you eight items on exactly that.
What you got wrong comes back
The item returns around the time you would forget it. Free — this is not a convenience, it is the learning itself.
What it costs
Free
Everything you need to learn
- 30 courses, every lesson
- 43,528 practice items
- Spaced review · retention score · weak-point diagnosis
- XP · levels · streaks · badges
$3.99 a month
Extras with a subscription
- Writing corrections — your sentence, changed as little as possible, and why
- “Why was I wrong?” — ask about your own answer
- 20 items picked for you every morning
$21.99 a year saves you 54%.
See the subscriptionThe material costs nothing. What costs money is what takes someone’s time.
Two kinds of language
The language of the screen
Menus, buttons and corrections are written in a language you already read. Telling a beginner “wrong answer” in the language they are learning is not feedback.
The language you are learning
A separate setting, changed from the same control in the header. So a Vietnamese speaker can learn Korean without a Vietnamese-to-Korean course ever having been written.