Learn data structures by watching them run
Structura is a free, interactive visualizer for data structures. Instead of only reading how a linked list or a heap behaves, you press a button and watch each step: pointers moving, items shifting, nodes being compared and rotated. People look for it as a data structure visualizer, visualiser or visualization tool, and this is all three: free, in your browser and step by step.
Every operation explains what happened in plain language, prints results in an output box and states its time complexity, so you learn the behavior and the cost together. It works in any modern browser on phones, tablets, laptops and large screens, with nothing to install.
Data structures you can explore
- ArrayFixed slots, instant access by index, shifting on insert and delete.
- Linked listNodes and pointers: singly, doubly and circular lists.
- StackLast in, first out: push, pop, peek.
- QueueSimple, circular and priority queues, plus the deque.
- TreeBST and self-balancing AVL trees with all four traversals.
- HeapMin-heaps and max-heaps shown as a tree and an array.
- Hash tableHashing, buckets, collisions and load factor.
- GraphNodes, edges, adjacency lists, BFS and DFS.
- TriePrefix trees for autocomplete and prefix search.
Common questions
- Is Structura free to use?
- Yes. Every visualization is free and runs in your browser with no sign-up.
- Which data structures are covered?
- Arrays, singly, doubly and circular linked lists, stacks, simple, circular and priority queues, deques, binary search trees, AVL trees, min and max heaps, hash tables, graphs with BFS and DFS, and tries.
- Who is it for?
- Students preparing for data structures and algorithms courses, anyone practicing for coding interviews, and teachers who want a visual aid in class.