DATARAKU - Data Structures

An educational visualization app that lets you UNDERSTAND data structures by watching them - not by reading.
Abstract concepts like stacks, queues, trees, and hash tables come alive as animations where the structure itself deforms in response to your operations.

[ Basics - 4 structures ]
- Stack (LIFO) - Feel "last in, first out" through stacking motion
- Queue (FIFO) - Watch the entry and exit ends of a queue
- Array - Visualize random access and the shifting of elements on insert / delete
- Linked List - Nodes connected by arrows, rewired on insert and delete

[ Advanced - 4 structures ]
- Binary Search Tree - Values drop into place after branching left or right by comparison
- Heap - Up-heap and down-heap motion in a complete binary tree
- Hash Table - Keys travel through a hash function and land in a bucket
- Graph - Nodes and edges showing adjacency

[ Features ]
- Every operation animates as a continuous deformation (no instant teleporting)
- Operation log to review the meaning of each step
- Each structure includes complexity notes (access / search / insert / delete), pros and cons, and real-world usage examples
- Ads are never shown while an animation is playing - designed to preserve focus
- Universal app for iPhone and iPad
- Japanese and English (follows OS language)

[ Who is this for ]
- Students learning programming for the first time
- Anyone preparing for IT exams
- Engineers who want to re-grasp data structures visually
- Curious minds who love watching things move

[ Companion to ARURAKU ]
The second information-systems title of the Raku Series, sibling to ARURAKU (algorithm visualization). The two apps cross-link, so the heap screen here links to ARURAKU's heap sort, and the graph screen here links to ARURAKU's BFS / DFS. Learn the "motion of computation" and the "structures that carry it" side by side.

[ Note on pricing ]
This app is completely free with no in-app purchases or subscriptions. To support development and maintenance we display Google AdMob banner and interstitial advertising. Ads are never shown while an animation is playing.