Flat UI vs Primer: What are the differences?
What is Flat UI? Free Bootstrap Framework and Theme. Flat UI is a beautiful theme for Bootstrap. We have redesigned many of its components to look flat in every pixel.
What is Primer? CSS toolkit and guidelines that power GitHub. Primer is the basecoat of GitHub, made by nerds just like you who share a passion for HTML and CSS.
Flat UI and Primer can be categorized as "Front-End Frameworks" tools.
Flat UI and Primer are both open source tools. Flat UI with 14.5K GitHub stars and 2.46K forks on GitHub appears to be more popular than Primer with 8.42K GitHub stars and 621 GitHub forks.