slightlyoff/cassowary.js

Health v2 · maintenance only

Flags: no_releases no_license

Adoption not part of the score

1732 stars · 107 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A JavaScript port of the Cassowary incremental constraint-solving toolkit, used to compute flexible, responsive layouts from weighted constraints. It powers constraint-based UI layout systems similar to Apple's Auto Layout and runs in browsers, web workers, and Node.js.

Use cases

• solve weighted constraint systems in JavaScript
• build responsive UI layouts from declarative constraints
• implement Auto Layout-style layout engines
• incrementally re-solve constraints when inputs change
• run a simplex-based constraint solver in a web worker

When to choose

• you need incremental, weighted constraint solving for UI layout
• you want a dependency-free, fast Cassowary solver in JS
• you're building a layout system or design tool driven by constraints

When to avoid

• you need general-purpose optimization beyond linear constraints
• you need an actively maintained library with recent updates
• you just need CSS flexbox/grid for standard layouts

Facets

library · maturity maintenance

math developer-tools web-development frontend graphics browser cli constraint-solver cassowary layout-engine simplex-method ui-layout algorithms nodejs javascript

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