Duolingo for Leetcode
AlgoFox breaks full problems into the skills underneath them. Practice spotting patterns, tracing code, catching edge cases, and debugging mistakes without giving up your evening.
Quick Play
Daily review
Open Today's Practice and get 10–20 short exercises with feedback after every answer. You can finish a session over lunch, on the train, or before bed.
A Quick Play questionIs ([)] valid? Pick from four answers, then see why the tempting choice is wrong.
Multiple choiceTraceShort answer
AlgoFox Pro includes company practice tracks - common patterns / questions get asked in FAANG interviews.
Inside the Amazon trackTake apart Trapping Rain Water, Number of Islands, and Koko Eating Bananas before rebuilding the optimal approach.
AmazonGoogleMetaApple
Wrong answers return in later sessions instead of disappearing into a completion score. Your pattern map shows where to spend the next ten minutes.
The six review categoriesTrack your progress across Arrays & Strings, Linear Structures, Trees, Graphs, Heaps & Intervals, and DP & Backtracking.
Mistake reviewPattern mapDSA Foundations
Space complexity
Unit 1Capstone
By patternReview
I used to save interview prep for the weekend, then skip it. Ten minutes after lunch is a much lower bar, and I have finally stopped restarting from zero every few weeks.
The code tracing drills exposed something I had been hiding with pattern memorization. I could name DFS, but I could not always tell you what the stack was doing.
Mistake review is the part I keep coming back to. It does not let a lucky guess quietly count as understanding.
Open AlgoFox, continue today's practice, and spend ten focused minutes getting better.
TraceDebugApproach
