When comparing Skeleton vs UiKit, the Slant community recommends Skeleton for most people. In the question“What is the best CSS framework?” Skeleton is ranked 5th while UiKit is ranked 6th.
Ranked in these QuestionsQuestion Ranking
Pro Responsive grid
Pro Style agnostic
Pro Vanilla CSS
No bells and whistles for Skeleton, it's just CSS.
Pro Media queries
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 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 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 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 Not maintained anymore
No active development for two years.
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.