Learn anything.The second brain for self-learners.
Tell Polyz what you want to learn. It sizes you up with a quick diagnostic, then builds a course made for you, and rewrites tomorrow's lesson based on how today went.
One place to learn it and one place to use it.
A tutor that builds the course, and a writing environment serious enough to do the work in.
A course built for you
Tell it a goal in plain language. It designs the syllabus unit by unit, grounded in real course material rather than whatever the model recalls.
It sizes you up first
A short adaptive diagnostic finds what you already know, so lesson one starts at your edge instead of the beginning.
Lessons that adapt
Each lesson watches where you struggle and rewrites the next one. Ask the tutor anything without leaving the page.
Your knowledge, connected
Notes and lessons link to each other and surface as a graph you can actually navigate. That's the second brain part.
A real manuscript editor
Not a chat box bolted to a text area. Binder, corkboard, outliner, snapshots, an AI that knows your characters and facts, and export to DOCX, PDF or EPUB.
Graded practice, not passive video
Every exercise is marked against a rubric with feedback on what to fix, and each lesson ends with a quiz that tells the course what to reteach.
Tell us what you want
Type it in plain language, the messy version. No course catalog to browse, no level to pick.
We size you up
A 90-second adaptive diagnostic finds what you already know and exactly where your edge is.
Learn, and it adapts
A course built for you. Each lesson watches where you struggle and rewrites the next one.
A professional AI writing app
Manuscript editor, an AI that knows your characters and facts, a writing coach that grades every exercise. In your browser or on your desktop.
Pro, $25.99/month
7-day free trial. $17.33/month billed annually. Cancel anytime.
- Up to 2 new personal courses every month
- AI tutor, graded practice, and writing feedback in every lesson
- The full Writing Studio, in your browser and on desktop
- Claude Sonnet, Haiku, and Opus across every feature
- A generous monthly AI quota, sized for typical heavy use
- Cloud sync, story bible, and every export format
What do you want to learn?
Free to start. The diagnostic, your course, and the entire first lesson cost nothing. You only add a card to keep going.
Start learning