The original version of the Heroku command-line tool was available as a Ruby gem. This made it easy to install on all platforms with just one command:
gem install heroku. While we love this simplicity, it depends on a system install of Rubygems. To get this experience on widely varying development environments, we created the Heroku Toolbelt, a one-click installer for every major platform.
Going forward we will be sunsetting support for the
heroku gem in favor of the Toolbelt. If you're already using the Toolbelt, you're fine to stop reading now. To verify whether you're using the gem or Toolbelt, use
$ heroku version heroku-toolbelt/2.32.11...