Data structures
Linked List
Follow next pointers, insert new neighbors, and reconnect the chain one step at a time.
NODES & POINTERS
AN INTERACTIVE LAB FOR CURIOUS MINDSDon’t just read it.
Don’t just read it.
See it happen.
Turn abstract ideas into something you can play with. Build a tree, follow a search, or teach a line to learn—one step at a time.
11 interactive visualizers4 areas to exploreNo setup needed
AN IDEA, MADE VISIBLE●
Big problems.
Small, simple steps.DIVIDE → SOLVE → COMBINE
Small, simple steps.DIVIDE → SOLVE → COMBINE
Explore divide & conquer
PICK SOMETHING. CHANGE SOMETHING. LEARN SOMETHING.
Your next “oh, I get it.”
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11 visualizers
Algorithms
Pathfinding
Watch a search spread through a maze, split into branches, and discover a route.
BFS · DFS · A*
Algorithms
Sorting Studio
Follow four sorting strategies, inspect each swap, and rewind to understand the difference.
COMPARE · SWAP · REPLAY
Algorithms
Merge Sort
Break an array into small groups, then watch their sorted answers merge back together.
DIVIDE & CONQUER
Data structures
Stack
Push onto the top, peek inside, and see why the newest value leaves first.
LAST IN, FIRST OUT
Data structures
Queue
Join at the rear and leave from the front. Follow the arrival order through every operation.
FIRST IN, FIRST OUT
Data structures
Binary Search Tree
Trace comparisons, explore traversals, and see how deletion reshapes a tree.
SMALLER LEFT · LARGER RIGHT
Data structures
Trie Explorer
See the tree behind autocomplete. Follow character branches and build a dictionary.
SHARED PREFIXES
Machine learning
Linear Regression
Plot data, inspect prediction errors, and watch gradient descent reduce the loss.
LEARN A LINE
Machine learning
Logistic Regression
Explore probabilities, label points, and discover what a linear classifier can—and cannot—learn.
LEARN A BOUNDARY
Chaos & emergence
Langton’s Ant
Follow one ant across an endless world and discover the pattern that emerges from its wandering.
SIMPLE RULES · SURPRISING ORDER
No matches yet.
Try “tree”, “sorting”, or “learning”, or explore all topics.
A GOOD PLACE TO BEGIN
Follow your curiosity.
Start small. Then connect the ideas.
BUILT FOR THE MOMENT IT CLICKS
A playground, not a slideshow.
Change the inputs. Test an edge case. Watch the result. Algo Playground makes room for the experiments that turn a definition into understanding.
Find your next experiment ↑