It's growing in popularity in the Rails community (probably because Rails now requires both Ruby and Node). Previously I recommended chruby in my installation guide for Ruby [0] and Rails [1], but after doing an informal survey of Rails users, I now show how to use asdf.
Actually I should add, I wrote a bit more nuanced recommendation in the installation guide. I say:
Install with Homebrew if you’re building only one project with Ruby (especially if you are a student learning Ruby). If you’re a solo developer and you're juggling multiple projects that can't be updated all at once, use asdf or chruby or rbenv. Choose asdf if you're using multiple languages such as Ruby, Node, and Python; otherwise chruby or rbenv are fine for just managing Ruby versions. Finally, use Docker or Nix if you’re on a team with a complex project environment (for example, Ruby, Node, Redis, and PostgreSQL all in one project).
[0]: [https://mac.install.guide/ruby/index.html] [1]: [https://learn-rails.com/install-rails-mac/index.html]