When comparing MUI CSS vs UiKit, the Slant community recommends MUI CSS for most people. In the question“What are the best lightweight responsive CSS frameworks?” MUI CSS is ranked 3rd while UiKit is ranked 4th.
Ranked in these QuestionsQuestion Ranking
Pro No external dependencies
11KB minified and gzipped
Pro Grid system - the same as Bootstrap
Pro WebComponents library
Pro HTML Email library
Pro React library
Pro Customizable using SASS
The MUI CSS can be easily customized by using the SASS files available on GitHub and via Bower. Customize breakpoints, font-settings and use Material Design colors.
Simple animations without too much fanciness keep the performance high and size small.
Pro Well architected
The code is pretty clean and follows well-defined conventions.
Pro Great style even out of the box
UiKit has a pretty good and clean style even out of the box without any customization needed.
Pro Extremely modular
Every aspect of the framework is designed to be modular, this way designers can easily choose which components to add to their stylesheet without risking to damage the overall style.
Pro Very customizable
UiKit's rather minimal style can be easily customizable to create an entirely new look to fit the needs of the designer.
Pro Built-in animation capabilities
UiKit has some built-in animation features which can be used to animate various components.
Pro Ready to use themes available
There are plenty of ready to use themes available from the official website. You can choose the theme that you want to use from the dropdown menu and then download the CSS, LESS or SASS file for that theme to use for the website.
Con Messy code classes
Nested classes become complicated to read to obtain desired result.
Con Pre-built starter templates are now behind a paywall
Easier to use Joomla! or Wordpress starter templates without paying money for it.
Con Not very popular
UiKit is not a very popular framework, especially compared to other options. As such it may be hard to find learning resources other than the official documentation or it may be more likely for development of UiKit to be dropped than for another more popular framework
Con Closed development
Development is mostly done in-house and not publicly available.