Grounded & fact-checked
Every module is built from real, cited sources and fact-checked on its key claims. You see the sources — not a confident guess.
Nodebook✦ AI that makes it stickUnderstand anything.
Understand anything.
And actually remember it.
Type any topic or paste a link — Nodebook compiles a rigorous, cited, multi-modal lesson with spaced-repetition practice. Not a chatbot reply you forget in five minutes.
Grounded in real sources · fact-checked · free to startProfessional6 sources
Reinforcement learning
A precise synthesis of how an agent learns to act from reward — kept to what the sources agree on.
Fact-checked · 97% of claims grounded9 key claims verified against real sources — not made up.
en.wikipedia.orgarxiv.orgplato.stanford.eduocw.mit.edu+2
01
The core principle
At its heart, RL rests on one idea: small, repeated adjustments toward reward beat one big leap. Hold this and the rest follows.
The difference
ChatGPT explains it. Then you forget it.
Studies find that learners who lean on AI alone score about a full grade level lower on a surprise test weeks later — fast to read, quick to fade. Nodebook is engineered the opposite way: grounded, effortful, and spaced — so it sticks.
How it works
Topic in. Lasting understanding out.
1
Hand it a topic
Type anything — “the Krebs cycle,” “backpropagation” — or paste a link.
2
Get a real lesson
A clear, cited, illustrated module — built intuition-first, fact-checked.
3
Make it stick
Quiz and flip-cards on a spaced schedule move it into long-term memory.
Why Nodebook
Everything aimed at one thing: you keep it.
Built to actually stick
Quizzes and flip-cards on a spaced-repetition schedule resurface ideas right before you'd forget.
Story mode
Turn any lesson into a cinematic, scroll-through story — each idea revealed as you go.
Any topic, any depth
Beginner to field-level rigor. Explanations build the intuition first, then the precise idea.
Your learning brain
Every concept wires into a living graph of what you know — with streaks, levels, and a global leaderboard.
Master Tracks
Going deep? Nodebook plans a whole ordered curriculum for a goal — as a finishable path.
Your learning brain
Watch your knowledge connect.
Every topic you compile adds concepts to a living graph — and they wire together as ideas recur across what you read. The more something matters, the bigger its node.
Make it stick
Practice that beats the forgetting curve.
Every lesson comes with quizzes and flip-cards on a spaced-repetition schedule — the science-backed way to move what you learn into long-term memory.
QuestionWhat does the central trade-off in RL balance?
AnswerExploration — trying new actions — vs. exploitation of what already works.AgainHardGoodEasy
Pricing
Start free. Go deep for the price of a coffee.
Free
$0/ month
- ~30 modules a month
- Standard web sources
- Spaced-repetition practice
- Illustrations & formulas
Pro
$7.99/ month
- 10× the monthly modules
- Scholarly sources — real papers & DOIs
- Master Tracks (full curricula)
- Professional depth · Story mode · no ads
Learn something that lasts.
Get the app, or start on the web — free.
or open Nodebook on the web →