Why Buildings Don't Fall Down
A beginner-friendly structural engineering Quiz about forces, load paths, and design trade-offs. It focuses on mental models: how bridges, towers, arches, floors, columns, and...
Quizbun gives you quizzes where every answer comes with an explanation, so you learn something even when you guess wrong. Browse the Catalog, bring your own quizzes, or ask your AI to write one for you.
Learn, don’t grade
Learning before testing
This is not an exam. Pick an answer (right or wrong) and the explanation opens immediately. The score is a side effect; the “aha” is the point.
- Pick an answer
- Explanation opens
- The “aha”
Local-first
Private by design
Your own quizzes and your progress stay on your device. There’s no account and no backend, so your data has nowhere else to go.
- On your device
- In your browser
- Never uploaded
How it works, technically
Quizbun bakes the public Catalog into the site at build time; your private quizzes and progress live in your browser’s IndexedDB. What happens in IndexedDB stays in IndexedDB.
Where quizzes come from
Three ways to begin
Take one, make one, share one. Every quiz you add sticks around for the next person, and sometimes the next person is future you.
Browse the Catalog
43 ready-to-take quizzes, every answer explained.
Pick a quizBring your own
Import a quiz you made (or one a friend shared) straight into your library.
Import a quizGenerate with AI
Copy our ready-made prompt into your favorite chatbot and watch a quiz appear.
Open the prompt
For quiz makers
A quiz is a single JSON file that follows the published standard, the same schema the AI prompt teaches a chatbot. Anything that validates can be imported.
Featured quizzes
English for Code Reviews
Practical English for pull requests and code reviews, organized as a small curriculum: commit subjects and PR titles, PR descriptions, the grammar that trips up non-native...
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Algorithms You Already Ship: A Frontend Engineer's Guide to Sorting, Windows, DP, Edit Distance & CSS Internals
A 50-question deep dive built to help frontend engineers better understand algorithms by grounding every concept in code you already write. Five techniques you already ship...
Auth & Sessions at Scale
Authentication is where security and system design collide. This quiz contrasts stateful sessions with stateless JWTs, then digs into the consequences: where to store tokens...
Behavioral Economics: Loss Aversion, the Decoy Effect, and the Power of Free
Forty questions on the most famous findings in behavioral economics — why losses hurt about twice as much as equivalent gains, how a useless third option (the decoy) can flip...
Big Numbers in the Economy: Estimate GDP, Inflation Math, and Compound Interest
Sixty-three questions that turn the economy's most quoted numbers into math you can actually do in your head. Three pillars: estimating GDP (the C + I + G + (X − M) identity,...
Big-O You Can Feel: Complexity Through Re-renders and DOM Work
Algorithms for frontend engineers — taught entirely through the costs you actually pay in the browser, so you feel asymptotic complexity instead of memorizing it. Three...
What the Cache Forgets: LRU & Eviction in SWR/React Query
You reach for TanStack Query and SWR every day — but do you know when they evict, and why a hand-rolled memo Map quietly leaks memory? Trace LRU eviction (hash map + doubly...
Caching at Every Layer
Follow one request from the browser outward through every cache it can hit — the HTTP cache (Cache-Control, ETag, Last-Modified, revalidation), the CDN edge, the client query...
Counterintuitive Probability
Monty Hall, the birthday paradox, the gambler's fallacy, and other places where careful probability overturns gut instinct. Each question pairs a tempting wrong answer with an...
CSS Cascade, Specificity & Inheritance
Read CSS conflicts the way the engine does: specificity by column, why @layer order outranks specificity (and how !important reverses it), unlayered-beats-layered, inherited...
The CSS Rendering Pipeline: Reflow vs Repaint & Why transform Is Cheap
Follow a pixel from CSS to screen: Style → Layout → Paint → Composite. See exactly what makes the browser re-run Layout (reflow) versus just Paint (repaint), why transform and...