About

watoolkit is a collection of small utilities that run entirely in your browser using WebAssembly. Nothing is uploaded to any server — all computation happens locally.

Venn Diagram

Paste up to four lists and instantly see how they overlap. Click any region to list the elements that fall into that intersection. Hover over a region to see a quick count tooltip.

The intersection algorithm is written in Rust and compiled to WebAssembly. The diagram is rendered entirely in the browser using the HTML5 Canvas API — no images are generated server-side.