When comparing Flutter vs Flat Remix CSS, the Slant community recommends Flat Remix CSS for most people. In the question“What is the best CSS framework?” Flat Remix CSS is ranked 18th while Flutter is ranked 25th. The most important reason people chose Flat Remix CSS is:
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.
Specs
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Pros
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.
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 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.
Con Google has a bad history with product loyalty
Con Flat design is not modern
Con Nothing new
No features making it out of the box.