Monoco: JavaScript Library for Squircles and Custom Element Corners

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Monoco is a lightweight JavaScript library that brings smooth squircle corners and alternative corner shapes to HTML elements using dynamically generated SVGs applied via CSS backgrounds or clip paths.

Key points

  1. Supports shapes including smooth squircles, round inverse, flat, inset, and custom corners.
  2. Generates dynamic SVGs applied as CSS background images or clip paths to ensure compatibility across modern browsers.
  3. Tracks element dimension changes and automatically redraws corner shapes.
  4. Available for vanilla JavaScript, Svelte components, and React components.

Why it matters

Standard CSS border-radius is limited to circular curves until CSS Houdini reaches universal browser support, even though design tools like Figma natively support squircles. Monoco bridges this gap between modern UI design systems and web implementation.

Analysis

Monoco offers a clean solution for UI developers seeking smooth corner curvature without waiting for browser-level CSS Houdini implementations. Its integration packages for React and Svelte combined with dynamic resizing make it practical for production component libraries.

Found in

Summary generated by AI (Gemini 3.8 Flash, 6 October 2026). It may contain errors – the original source is authoritative.

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Locations

  • Mattersburg
    Johann Nepomuk Bergerstraße 7/2/14
    7210 Mattersburg, Austria
  • Vienna
    Ungargasse 64-66/3/404
    1030 Wien, Austria

Parts of this content were created with the assistance of AI.