What is the difference between Bootstrap and Materialize CSS?

Bootstrap is a general-purpose CSS framework that leaves visual style up to the developer, while Materialize CSS implements Google's Material Design specification, giving every project built on it a shared card-and-shadow look out of the box. Both frameworks use a 12-column responsive grid, but they start from opposite assumptions about how much a project should look like anything else.

When does each framework fit best?

When Bootstrap fits

Bootstrap fits projects that need their own visual identity: marketing sites, admin panels, and products with an existing brand system. Its component set, including navbars, modals, forms, and cards, is meant to be overridden with custom Sass variables or CSS, and its size and age mean most edge cases already have a documented solution.

When Materialize fits

Materialize fits projects that want a consistent, Google-style interface without hiring a designer to define one. Elevation shadows, ripple effects on buttons, and card layouts come built in, which shortens the path from prototype to a polished-looking screen. The tradeoff is less freedom to deviate from that look without fighting the framework's defaults.

Who fits what?

• Teams with an existing design system or brand guidelines: Bootstrap, because its components are meant to be restyled rather than used as-is.
• Small teams or solo developers who want a finished-looking UI fast: Materialize, since Material Design decisions are already made for them.
• Projects that need long-term community support and frequent updates: Bootstrap, given its larger, more active maintainer base.