When comparing UiKit vs Flat Remix CSS, the Slant community recommends UiKit for most people. In the question“What is the best CSS framework?” UiKit is ranked 9th while Flat Remix CSS is ranked 18th. The most important reason people chose UiKit is:
The code is pretty clean and follows well-defined conventions.
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Pros
Pro Well architected
The code is pretty clean and follows well-defined conventions.
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.
Pro Easy to use.
When using UIKit classes, it is used with the ui- prefix which is very good. Components are explained straight-forward.
Pro Built-in animation capabilities
UiKit has some built-in animation features which can be used to animate various components.
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 Simple and lightweight
Simple CSS library that provides a set of predefined elements for a rapid web applications development. It follows a modern design using "flat" colors with high contrasts and sharp borders.
Pro Very lightweight
Minified, it only weights 7.5KB.
Pro No JS needed
No javascript code is needed. It only uses css so importing it is so much easier.
Pro Modern design
It follows the latest design trends but also shows its own personality.
Cons
Con Messy code classes
Nested classes become complicated to read to obtain desired result.
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 Slow development
New features and updates trickle out over 6-12 month development cycles, bug fixes are more frequent but very slow and selective as well.
Con Pre-built starter templates are now behind a paywall
Easier to use Joomla! or Wordpress starter templates without paying money for it.
Con Closed development
Development is mostly done in-house and not publicly available.
Con Flat design is not modern
Con Nothing new
No features making it out of the box.