The prof who
explains it again.
You lose the thread somewhere in the middle, and spend the next ten minutes writing down words you don't follow. Mark the moment — one tap, nothing to type. Afterwards, My Prof teaches you that exact passage: plainly first, then properly, then the thing you were probably missing before it started.
macOS 15 or later, Apple Silicon. Free to use; Pro is a subscription.
“…so the residual is just what the projection leaves behind, which is why it's orthogonal to the column space.”
I'm lost marked as you went — nothing to type, nothing to interrupt
Afterwards
- Plainly. The shadow a vector casts, and the bit of it that misses.
- Properly. The projection, the residual, and why their dot product is zero.
- What you were missing. Column space — from two weeks ago, where you also got lost.
How a pin works
Mark it once. Move on.
It marks a passage, not a point
You notice you're lost after the explanation went past, so a pin reaches backwards as well as forwards. It catches the part you missed, not the part where you realised.
It answers from your course, not the internet
The explanation is built from your own material — what your course actually covered, in the order it covered it — rather than a general answer about the subject.
Everything you get out leads with your pins
The notes, the flashcards, the quiz, the cram sheet. They are weighted toward the moments you marked, not toward whatever the course spent longest on.
Your material, not a generic syllabus
Give it the slides, the chapter and the handout.
Add the deck your professor posted, the chapter the reading list points at, a handout, a scan, your own notes. My Prof reads all of it and treats it as one course, so everything it gives you back is grounded in what you were actually set.
It reads pages properly
Documents are read by macOS's own text recognition — the engine behind Live Text. Measured across 89 test images of real slides: 95% of words read correctly, against 83% and 77% for the open-source readers we compared with.
PDFs keep their own text
A PDF that already has a text layer is read directly, with nothing sent anywhere and nothing to guess at. Only a scanned page — one that is really a picture — goes to the reader.
What you get back
Notes you didn't write, from the course you did take.
Course notes
Structured, with the visual material that belongs beside each part pulled in.
Explanations
Every moment you pinned, taught back three ways.
Flashcards
From your own material, not from a generic deck.
Practice quizzes
Questions your professor could plausibly set.
Study guides & concept maps
How the pieces of a course connect, drawn from the course.
Exam-cram summaries
The night-before version, weighted to what you struggled with.
And an assistant that has actually read your course
Ask it something and it answers from your own material — the Course Brain it has been building since your first upload. It is not a chatbot that has heard of your subject. It is one that went through your version of it.
The part most study apps are vague about
Your material stays on your Mac.
This is not a phrase in a privacy policy; it is how the thing is built. The work happens on your own machine. Search runs against a database inside the app's folder. There is no upload step, because there is nowhere to upload to.
Never leaves your computer
- The files you add — slides, PDFs, scans, notes
- Everything produced from them on this machine
- Your search, which never touches a network
You can delete any of it at any time, and deleting the app's folder removes all of it at once.
Goes out, when you use an AI feature
- The prepared text a model needs to answer
- On Pro, selected page images, so handwriting, diagrams and equations can be read
It goes to My Prof's own server, which holds the model key so your Mac never has to. That server keeps no course text — only which account, which model, how many tokens and when.
Start with the course you're least sure about.
Free covers adding your material, reading your files, your class calendar and generated notes. Pro opens the explanations, the study tools and the assistant.