LabArbyx: Stay balanced, no matter what you add

Arbyx is an interactive B-tree visualiser that stays balanced through every insert and delete while showing its structure live. The signature technique is the textbook B-tree mechanics - split-on-insert and borrow-or-merge-on-delete - backed by a live invariant validator and a 1000-operation fuzz test cross-checked against a reference set, with every invariant verified after each step. It is a from-scratch, dependency-light build you can download and run locally.