Drill CS until it's in your bones.
Spaced repetition tuned to how software engineers forget — fast before interviews, slow after promotions. Pick your persona. Start drilling.
Real users. Real streaks.
Explain amortized O(1) for dynamic arrays. Why does doubling capacity work?
Each element is copied at most twice on average. The doubling strategy ensures total work across n insertions is O(n), giving O(1) amortized per insert.
cards reviewed globally in the last 24h
Current Streak
47 days
15 weeks · 312 sessions
Priya Nair
Cohort Lead · App Academy SF
"Our entire cohort used Cram for the last 3 weeks before interviews. 11 of 14 students landed offers — including 4 at FAANG. The spaced repetition actually works."
Free Decks
Browse all →How Cram Actually Works
Not another flashcard app. A precision drilling system tuned to the exact curve of engineer memory decay.
01 / Pick Your Track
02 / Drill with Spaced Repetition
03 / See Your Gap Analysis
Pick Your Track
Choose from Algorithms, System Design, or CS Fundamentals. Cram's algorithm reads your existing knowledge gaps from a 5-question diagnostic and builds a deck weighted toward what you're most likely to blank on under pressure.
Drill with Spaced Repetition
Cards resurface at the exact moment you're about to forget them — not a day early, not a day late. The algorithm tightens intervals before interviews (7 days out: daily review) and widens them after you've proven mastery.
See Your Gap Analysis
After each session, your radar chart updates across 5 domains: Arrays/Strings, Trees/Graphs, DP, System Design, and Concurrency. Share your profile with study groups or import it into your FAANG prep spreadsheet.
Built for how engineers
actually forget things.
The forgetting curve hits hardest 72 hours after you learn something. Cram schedules exactly there.
Interview-Mode Tightening
7 days before your scheduled interview, Cram automatically shifts every due card to daily review. No manual configuration needed.
CS-Specific Cards
Cards include runnable pseudocode, Big-O annotations, and edge-case callouts. Not generic Q&A.
Shared Deck Builder
Professors and cohort leads can push decks directly to student accounts. Version control for flashcards.
Radar Gap Analysis
After each session your radar chart updates across Arrays, Trees, DP, System Design, and Concurrency — showing exactly where to drill next.
Streak Accountability
Daily streaks with heatmaps. Share your 30-day chart in Discord study servers.
Offline on Mobile
Download your deck. Review on the subway. Syncs when you reconnect.
What engineers say after their loops
"I crammed 400 cards in the 2 weeks before my Google loop. Nailed the tree traversal question cold."
Marcus Webb
SWE II → Google
"My entire cohort used the shared deck feature. Profs can push cards directly — game changer for midterms."
Aisha Okonkwo
CS Professor · Howard University
"The interview-mode tightening is genius. 7 days out and every card shows up daily. Felt prepared, not panicked."
Ravi Krishnamurthy
Staff Eng. → Meta
Find Your
Weak Spots
5 questions. 3 minutes. You'll get a personalized radar chart showing exactly which CS domains to drill before your next interview.
No signup required to start