You were born curious.
Then came the syllabus.
Ask anything. Feynman builds you a hands-on quest: predict, experiment, break it, explain it, until the idea is yours.
No sign-in needed to play. Try the one on the right.
Flip a fair coin 10 times. How often do you get exactly 5 heads?
Commit to a guess to unlock the coin.
Why we exist
Learning got stuck in the syllabus.
Same course for everyone.
Fixed order, fixed pace, fixed examples. It can’t see where you went wrong, so it can’t help you get it right.
A chatbot stapled to the past.
Old content with a search box on top. It tells you things. It doesn’t make you curious.
Answers aren’t understanding.
Answers are free and everywhere now. That makes it easy to feel you understand what you only read.
From question to quest
Ask anything. Get a route, not a wall of text.
Your question becomes three to five ideas in an order that builds, each with one experiment that makes it click. The route appears first; each step is built while you work on the one before.
Pick a question to watch its route take shape
- 1Score every word against the query
- 2Turn scores into weights with softmax
- 3Blend the values by weight
- 4Watch temperature sharpen the focus
Live labs
Don’t take our word for it.
Touch it.
Each lab is the main experiment of a real quest our engine built: a live model running the actual maths, run and checked before you see it. Here’s a goal. Meet it.
A meter reads 232 Ω across a resistor network. Disconnect one resistor. Will the reading rise, fall or stay the same?
Open the full labOne goal, one model. Change the controls until it’s met.
How a quest works
Predict. Experiment. Explain. Apply.
Every idea asks you to think before it explains. Step through one on a real lab.
Commit before you see.
Every idea opens with a guess. A wrong prediction you can test beats a right answer you were told.
Your prediction
The valley is 8× steeper across (w₂) than along it (w₁). If you double η from 0.1 to 0.2, what happens across the valley?
Pick one. You’ll see if you were right.
Many ways in
Stuck? See the same idea another way.
Type a slash command in any quest and a new view of the same idea is built for the step you’re on.
/equation
the derivation, step by step
/diagram
how the parts connect
/code
a runnable program with tests
/experiment
a different lab
/simulate
run it over time
/compare
two cases on one chart
/example
the same idea, a new setting
/quiz
two to four quick graded items
Missions
Whatever you’re learning for.
Tell us why, and the route, examples and depth change with it.
How each mission worksBring your own source
Learn from the thing you’re actually reading.
Paste a YouTube lecture, an article or an arXiv link, or upload a PDF or an image. The quest follows what the source actually says.
- YouTube lecture
- Article
- arXiv paper
- Image
Showcase
Real quests our engine built from real questions.
What we believe
Understanding you can show.
- No homework vending machine.
- No guilt streaks.
- No leaderboards.
- No infinite feed.
- No ads.
- No selling your data.
- No fake “mastered” badges.
- 01
Evidence, not badges.
We keep what you predicted, tried and explained, and bring ideas back for review. We never claim you’ve mastered anything.
- 02
Ideas that come back.
What you learn returns at growing intervals, each time in a new situation, so it stays after the quest ends.
- 03
Real models only.
Every lab runs the actual mathematics or algorithm. Change a value and you see its true consequence.
- 04
Your learning is yours.
No ads and no selling data. Your quests and answers are private to your account.
Questions
Before you start.
What do you want to understand?
You can outsource your thinking. You can’t outsource your understanding.