When comparing Pure CSS from Yahoo! vs Flutter, the Slant community recommends Pure CSS from Yahoo! for most people. In the question“What is the best CSS framework?” Pure CSS from Yahoo! is ranked 15th while Flutter is ranked 25th. The most important reason people chose Pure CSS from Yahoo! is:
Has an extremely minimalist look that is super-easy to customize since it basically gives designers just a foundation on which they can easily build their design.
Specs
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Pros
Pro Easy to customize
Has an extremely minimalist look that is super-easy to customize since it basically gives designers just a foundation on which they can easily build their design.
Pro Cross-Browser compatibility
A solid base built on Normalize.css to fix cross-browser compatibility issues.
Pro Lightweight
Extremely small file size: 4.5KB minified + gzip.
Pro Responsive
A responsive grid that can be customized to your needs.
Pro Works well with Bootstrap
Easily use Bootstrap CSS and JS elements within the framework.
Pro Open source
Pro Great developer tools debug/hotreload/analyser
Pro Based on Dart language
Dart is a Java like language, easy to learn and startup fast for millions of Java developers.
Pro A single codebase for iOS AND Android
Pro Fast
The developer's goal is to allow people to make apps running at 120 FPS.
Cons
Con Not suitable for beginners
Since Pure CSS only carries a minimum number of styles out of the box, it might not be great for beginners who want a complete style that looks good out of the box without having to customize it.
Con Still in development
According to the website, Flutter is still in its early stages of development.
Con Based on Dart language
Dart is a Java like language, easy to learn and startup fast for millions of Java developers. BUT if you have to learn it ... it's a con.
Con Dart is unpopular and never gained serious community traction like Kotlin or Java
Con Does not support 32-bit iOS devices
If you plan on targeting iPhone 5, 5C or earlier, you can forget about Flutter.