Based on our record, Simple Grid seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on Reddit, HackerNews and some other platforms. They can help you identify which product is more popular and what people think of it.
From my experience with Bootstrap I can tell you the only thing you really need is the grid part of it and there are so many lightweight "frameworks" that have just that and its only 250 lines of css in the example of simple grid: https://simplegrid.io/ Everything else, buttons, modals, sliders, chords are super simple anyway you can just make them yourself or use a way more featurerich separate slider or modal... - Source: Hacker News / 2 months ago
a lightweight css grid is https://simplegrid.io/. - Source: Reddit / 4 months ago
Webflow Flexbox UI Builder - Build flexible, responsive layouts — without writing code
CSS Gridish - Automatically build your grid design's CSS code ✨
Fluid for Sketch - Sketch plugin to make your responsive designs more efficient
Dimensions Toolkit - Chrome Extension for designers to test responsive websites.
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Flexbox Grid - Grid based on CSS3 flexbox