Upload your notes, slides, or papers. Cognometrist — built on artificial intelligence models trained with reinforcement learning and structured fine-tuning — maps every concept your material contains, generates exams that surface what you’re missing before you feel it, and teaches the shortest path to complete understanding, cited line by line from your own sources. Cognitive psychology chooses what to teach you next; psychometric scoring decides whether it worked. Neither is guesswork.
Free to start — three full study days, no credit card.
Momentum is conserved in any closed system1 — which is why the cart’s velocity must fall as the mass increases.2
Every claim cited back to your own pages.
see it in motion
how a session works
Drop in PDFs, slides, or notes. Neural embedding models read every passage — page forty counts as much as page one.
Artificial intelligence models extract the concepts and prerequisites hiding in your sources and map them into a graph of what mastery requires.
A source-grounded exam locates what you already know, so teaching starts exactly where your understanding stops.
A large language model writes each lesson for the one concept you are ready for next — and cites the passages it drew from.
Spaced repetition schedules every mastered concept for review before you would forget it — daily, then weekly, then monthly.
retrieval-augmented generation
Generic AI tutors answer from everything they were ever trained on. Cognometrist retrieves the exact passages of your own material for every lesson and every graded answer, and marks each claim with a citation you can open. When it says you missed a point, it points you to the line.
Almost — conservation only holds when the system is closed, and your cart problem adds mass mid-run.
The exact line you missed, from your own notes.
where the gap is
Most tools can tell you the topic went badly, which leaves you rereading a chapter to find the one sentence you never understood. Because Cognometrist teaches a concept only after everything it depends on is proven, a wrong answer cannot mean the foundation underneath — that was already established. It means this idea, and it can say which.
None of these techniques are new. What makes them diagnostic is running them over a graph of your own material, where each one rules an explanation out until only the concept in front of you is left.
And when the problem is not one concept but the whole path, say so. Tell it what is not landing and a diagnostic runs three rounds of questions across the different routes through your graph, then carries on from whichever one you did best on — the thread you can actually pull, rather than the one the plan happened to open with.
mastery tracking · spaced repetition
Cognometrist will not teach a concept until everything it depends on is proven — so a gap has nowhere to hide. Its models keep generating exams that probe for what you may be missing, often before you feel it yourself. Slip on a concept you once mastered and it revokes that mastery and teaches the concept again. Highlight what confused you and the graph reshapes around your own questions. Completely lost? A diagnostic hunts down the missing foundation and starts there.
And it holds. Spaced repetition resurfaces every mastered concept just before you would forget it — daily, then weekly, then monthly — so understanding compounds instead of fading. This is not a cram tool: it builds a comprehensive understanding of your subject that persists long after the exam.
pricing
Three full study days free — days you actually study, not days on a calendar. When you want more, Pro is one subscription, billed on whichever schedule you choose.
A day counts the first time you put Cognometrist to work on it, so signing in to look around spends nothing and a week you skip costs nothing. The three days are counted for the life of the account, not from the date you sign up. No credit card to start.