When comparing Bootstrap vs UiKit, the Slant community recommends Bootstrap for most people. In the question“What is the best CSS framework?” Bootstrap is ranked 2nd while UiKit is ranked 5th. The most important reason people chose Bootstrap is:
Ranked in these QuestionsQuestion Ranking
Pro Consistency across browsers
Pro Responsive design philosophy
Bootstrap is developed to be instantly compatible with all sizes of screens, so you don't have to worry about which device the user is accessing your site from. Yet if you prefer, you can disable responsiveness of Bootstrap.
Pro Well documented
Documentation is thorough, well organized and full of live examples and templates ready for use. Every component and every part of the framework is explained and covered in depth.
Pro Designed to get a site running quickly
Bootstrap is designed to get a site up and running quickly. Each of it's components is pre-configured to help with getting a site up and running quickly.
Pro Great community
Bootstrap is very popular and has a large community. As a result of this it is much easier to find help with anything you might need. This also gives you a treasure trove of prebuilt components to use and add to your site.
Pro Supports responsive embeds
Allows easily adding responsiveness to
Pro Easily make professional looking websites
Bootstrap makes it easy to learn how to make professional looking websites. It can even make code junkies semi-enjoy design.
Pro Custom builds
Bootstrap can be customized in a variety of ways. Either by overriding the default CSS styles with new CSS styles or by editing the
.scss Bootstrap files.
Pro A wide variety of themes available
To help you avoid the "Bootstrap look", there are many resources that provide a great selection of themes and templates for Bootstrap.
Pro One of the most popular ones
Ranked on GitHub as the most starred CSS repository.
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.
Con Large file size out of the box
Bootstrap has an out-of-the box filesize of ~276K, which is pretty large considering it's just CSS. Most of those styles aren't even used in 90% of web pages built with Bootstrap. By only including the required styles it can be trimmed by 70%-75%.
Con Websites can start to look the same
If the initial Bootstrap colors and styles are not changed or edited, different websites start looking the same even if they have nothing to do with each other and they are made by different developers.
Con Too many classes
Bootstrap's over-reliance on HTML classes for styling can get very messy very quickly. There's also an overabundance of DOM elements which have a lot of classes and are more often than not nested inside DOM elements with even more classes. This gets problematic down the line because the maintainability of the project gets harder when the project starts to get large.
Con Hard to customise
It's quite hard to customise Bootstrap using pre-processors like SASS and LESS, the only real flexibility is with typography and colours.
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 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.