What it costs.
A concept is one idea Kairn has pulled out of what you drop in, and that it brings back to you at the right moment. You keep 50 a month without paying.
Free plan
50
concepts a month
Freeforever
Enough to find out whether it sticks.
Premium
Premium isn't available in English yet.
It raises the limit to 500 new concepts a month. Everything else is already in the free plan.
What the plan doesn't change.
Everything else is the same
Reviews, practice, question formats, the cairn: none of it depends on your plan. The only number that changes is how many concepts you can keep in a month.
Your month starts when you sign up
Not on the 1st. If you sign up on the 12th, your counter resets on the 12th. What you don't use doesn't carry over to the next month.
Start for free
No card, no commitment.