Ace the coding interview —
and actually remember how.
You solve it once, then blank three weeks later. crackpad turns the grind into lasting memory with spaced repetition, story-varied problems, and company-specific mock interviews.
Free forever tier · No credit card required
Never forget a pattern
FSRS spaced repetition resurfaces each problem right before you'd forget it. What you grind actually sticks — for the interview and beyond.
Beat memorization
The same pattern arrives as a different story every time. You learn the idea, not the wording — so new problems don't catch you off guard.
Practice by company
Company-tagged problem sets and auto-built mock interviews. Prep for exactly the questions your target company asks.
Real interview pressure
Timed mock interviews — no hints, no editorial, just the clock. Walk in calm because you've already done it.
A judge you can trust
Deterministic validation across 9 languages — C#, Python, JS, TS, Go, C++, C, Java, Rust. Cross-checked test sets, no flaky verdicts.
SQL, not just coding
A full SQL track with its own multi-dialect judge (SQLite & Postgres) — and SQL-only mock interviews for database-heavy roles.
The questions that matter
Curated Top 75 / 150 / 250 lists — the most-asked interview problems, ranked by real company frequency.
Explore by topic
Drill the most-used algorithms directly — Arrays, DP, Hashing, Graphs, Trees and more, each with its own problem set.
A guided roadmap
Every pattern connected by its prerequisites, foundations up — an interactive map of the whole path to mastery.
Learning courses
Guided lessons with diagrams — like the System Design course — for the concepts raw problem-grinding won't teach.
Know what to drill
A weakness map and readiness estimate turn 2,600+ problems into a focused plan — so you prep smart, not just hard.
Free to start
A free-forever tier with spaced repetition included. No credit card to begin. Upgrade only when you want more.
Built for FAANG-style interviews. Nine languages plus SQL, a deterministic judge, and a weakness map that tells you exactly what to drill next — so you prep smart, not just hard.
Grind less. Remember more. Get the offer.
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