For people who need to be sure
Find out what you actually know.
Study a step from named sources, then explain it out loud in one take. You get a level, the things to unlearn, and reviews that keep it.
Sign-up is by invitation: tell us what you want to learn, and we email you when your invitation is ready.
- 1An early product, built in the open. Tell us what you want to learn; subjects are built from public sources, and the catalogue is small and growing.
- 2Every course says Verified while a check by a person who knows the field is current, and Beta otherwise.
How it works
- 01 · Read
Study one step
A lesson built from public sources you can check. Take as long as you like: there is no countdown.
- 02 · Explain
Say it out loud
Three questions, one take each, no re-records. Like explaining it to a colleague.
- 03 · Level
Get your level
A level from 1 to 5, the claims you got wrong, and what is actually true.
What you get back
Example · a result
Explained it yourself
Level 3 of 5
Substantially correct and carried by you, with gaps. This passes the step.
“Compound interest is interest on the money you put in.”
That is simple interest. Compound interest is also paid on the interest already earned, so the balance grows faster the longer you leave it.
No points, streaks or badges. Your reviews are counted by the week, so a missed day never resets anything.