Eunoia

Eunoia

Area-Proportional Euler and Venn Diagrams

Fit set sizes and intersections with circles, ellipses, squares, and rectangles. A Rust engine shared by JavaScript, Python, Julia, and R.

Try it in the browserRead the docs

See It in Action

A three-set diagram, fitted in your browser by the same WASM core the packages ship. Drag the region sizes or switch the shape and watch it re-solve live.

Eunoia fits shapes to the sizes of sets and their intersections. Use the diagram builder to explore your own data, or follow a quickstart to use Eunoia in your preferred language.

Install

Rust

cargo add eunoia

Read the Rust quickstart or the full Rust API reference.

JavaScript

npm install @jolars/eunoia

Read the JavaScript quickstart. The WASM bindings power the web app and every interactive example on this site.

Python

pip install eunoia

Read the Python quickstart. The Python package provides bindings to the Rust core and plotting with matplotlib.

Julia

using Pkg
Pkg.add("Eunoia")

Read the Julia quickstart. Eunoia.jl provides bindings to the Rust core and plotting with Makie.

R

install.packages("eulerr")

Read the R quickstart or the eulerr documentation.

Why Eunoia?

  • Exact n-way intersection geometry for circles and ellipses, with analytical gradients and efficient optimizers.

  • Circles, ellipses, squares, rectangles, and rotated rectangles.

  • Multiple loss functions and selectable optimizers, including CMA-ES, Levenberg–Marquardt, L-BFGS, and Nelder–Mead.

  • Optional bounding containers for fitting the complement of the named sets.

  • Customizable labels, glyphs, colors, and exports.

  • A pure Rust core with bindings for JavaScript, Python, Julia, and R.

Citing Eunoia

If you use Eunoia or its language bindings in academic work, please cite:

Larsson, J., & Lee, N. M. (2026). Eunoia: Area-Proportional Euler and Venn Diagrams in Rust, Julia, Python, R, and JavaScript (arXiv:2611.02198). arXiv. doi:10.48550/arXiv.2611.02198.

The citation page provides BibTeX, BibLaTeX, CSL, APA, Vancouver, and Chicago formats, along with software-release citations.