Personally I'd rather use Grape over Sinatra. I also wrote Modern[0] to provide a really nice, functionally-oriented OpenAPI server for Ruby that is very much N

Personally I'd rather use Grape over Sinatra. I also wrote Modern[0] to provide a really nice, functionally-oriented OpenAPI server for Ruby that is very much Not Rails. (Looking at porting it to TypeScript soon to provide a similar-feeling API.) [0]: https://github.com/modern-project/modern-ruby https://github.com/modern-project/modern-ruby