Primer vs Topcoat: What are the differences?
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.
What is Topcoat? CSS for clean and fast web apps. TopCoat is made up of base controls, platform specific styles, themes and a build script to stitch them all together.
Primer and Topcoat can be primarily classified as "Front-End Frameworks" tools.
"simple" is the primary reason why developers consider Primer over the competitors, whereas "Open source" was stated as the key factor in picking Topcoat.
Primer and Topcoat are both open source tools. Primer with 8.42K GitHub stars and 621 forks on GitHub appears to be more popular than Topcoat with 4.31K GitHub stars and 417 GitHub forks.