[SippinLean]

Bulma seems much more limited in scope than BS4. Are there any JS components or Sass mixins?

>an open source CSS framework based on Flexbox and built with Sass

So, like BS4?

Spectre seems to lift most of the components directly from Boostrap, the grid system and naming conventions appear identical.

In some cases they are using some terrible practices, like the "CSS only" carousel that involves hidden radio buttons!