Quantum UI Kit by Spline.One is a large Bootstrap-grid web UI kit: 1,200+ UI cards and 200+ pages across categories like e-commerce, dashboard, social, and news, compatible with Sketch and Photoshop.
The card-based, drag-and-drop assembly across many pre-built page categories covers a wide range of common site types without designing each page's layout from scratch.
Good for agencies or freelancers who take on varied client projects and want one large kit that flexes across e-commerce, dashboards, and content sites alike.
Being built on a fixed Bootstrap grid (1170px) ties its layouts to that framework's conventions: less of a fit if your project isn't Bootstrap-based.
