Bulma is a modern CSS framework based on Flexbox. It is open-source and easy to use for designing responsive web interfaces.
Best Open Props Alternatives ranked by AI · updated Aug 2026
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Open Props is an open-source collection of CSS custom properties for spacing, colors, typography, layout, and visual effects. It is for developers who want a reusable design-token foundation with optional utility classes and minimal framework overhead.
Top 6 Open Props alternatives
Bootstrap is a popular front-end framework for building responsive and mobile-first websites.
Foundation is a responsive front-end framework that helps you build beautiful, responsive websites quickly and easily.
A utility-first CSS framework for rapidly building custom designs.
Free and open-source
Spacers.js is a small JavaScript utility for adding configurable spacing elements to web pages. It is intended for front-end developers who need...
Pros
- Much smaller scope than a full CSS framework
- Can add spacing dynamically with JavaScript
- Free and suitable for lightweight web projects
Cons
- Less capable than modern CSS layout and utility systems
- Adds runtime JavaScript for a task CSS can often handle
- Smaller ecosystem and fewer integrations than major frameworks
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