Everything in the catalog

Design database schemas visually, then export SQL for PostgreSQL, MySQL, SQLite and others.

Draws an entity-relationship diagram from pasted CREATE TABLE statements, locally in the page.

Build line, bar, bubble, pie, donut, scatter and radar charts that are drawn locally in the browser.

Create, preview and export Mermaid diagrams as SVG or PNG in the browser.

Embeds sentences with Qwen3 in the browser and plots them on a 2D scatterplot by meaning.

Plots a JSON document as a physics-style graph where each node is an object, array or value, rendered locally.

Plots surfaces z = f(x, y) you can rotate.

Graphs equations in x and y, including implicit curves.

Shows how adding sine terms builds up a Fourier series.

Shades the region that satisfies one or more inequalities.

Drag a line on a graph to see its slope and equation change.

Renders DOT graph source as SVG as you type and stores the graph in the URL fragment for sharing.

Runs pandas, numpy and matplotlib in the browser via Pyodide to draw a bar chart.