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 various public social media platforms and blogs. 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 / almost 2 years ago
a lightweight css grid is https://simplegrid.io/. Source: almost 2 years ago
Invision - Prototyping and collaboration for design teams
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Axure RP - The prototyping and specification software used by 87% of the Fortune 100. Beyond mockups, design interactive prototypes for business solutions, websites, and applications.
CSS Gridish - Automatically build your grid design's CSS code ✨
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Bulma - Bulma is an open source CSS framework based on Flexbox and built with Sass. It's 100% responsive, fully modular, and available for free.