Trailblazer Cells and Stimulus Reflex are great tools, but one big advantage of matestack (https://matestack.io) is to write UI components in pure Ruby, giving you the possibility to use Ruby's language features creating a really dry and clean UI implementation while having a lot of fun doing so! Adding the reactive core components on top saving you a lot of time and effort creating reactive UIs in pure Ruby. Compared to Stimulus Reflex, you have to write less code and manage less added complexity. That's at least my experience. But as said: Cells and Stimulus Reflex are great projects, don't get me wrong. I just love the pure Ruby thing ;)