Interactive learning

See algorithms work, not just read about them

Live, step-through visualizers that draw how a data structure changes state — and why it behaves the way it does.

Try the Linked Lists visualizer Open a topic →

Topics

Interactive tutorials with live visualizers and runnable examples.

Problem Walkthroughs

Whiteboard-style animated solutions to classic problems. Watch the array, pointers, and pseudocode move together, one narrated step at a time.

step-by-stepsynced codenarrated

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Linked Lists

Animated node chains: build, insert, delete, break the chain on purpose, race the tortoise and hare, and drive a playlist.

nodes & pointersdoubly linkedFloyd's cycle

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Bitwise & Number Systems

A byte as 8 light switches: flip bits, watch decimal→binary conversion animate, and compare bytes in a live AND/OR/XOR/shift playground.

place valuedecimal → binarybitwise ops

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Recursion & Big-O

Step through the call stack frame by frame, watch a Fibonacci tree explode with repeated work, compare Big-O growth live, and learn a 6-step method for any problem.

call stackFibonacci treeBig-O

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Sorting Algorithms

Step through bubble, selection and insertion bar by bar, replay merge and quick sort's recursion, compare growth rates live, and see why stable, in-place and adaptive matter.

O(n²)O(n log n)sort by key

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How these lessons help

Step-by-step

Advance one operation at a time to build clear mental models of algorithms.

Built-in examples

Ready test cases and edge cases so you can practice without setup.

No setup

Open in any browser—no account or install required.