I have purchased Tailwind UI in the past, but for Rails developers, Rails UI goes the extra mile as this sentence on the JavaScript page explains:

Rails defaults use Stimulus.js and Turbo from the Hotwire ecosystem. Rails UI follows these conventions and includes pre-built Stimulus controllers for common UI patterns.

oh yea I absolutely understand the niche this Rails UI fits in. I was just drawing parallels to Tailwind UI. Rails is a more "opinionated" version.

For comparison sake, TW Plus appears to be the same price for life as Rails UI is for one year.