Bootstrap Email

Bootstrap Email compiles Bootstrap-style markup into table-based HTML with inlined styles, so emails render in email clients. The gem runs from the command line or inside a Ruby or Rails project, where the Rails route calls bootstrap_mail in place of mail. The documentation names Bootstrap and Tailwind as its sources of inspiration.

Worth knowing

Ruby has to be installed on the machine that runs the compiler. A hosted online editor is offered as another way to use Bootstrap Email, and the docs describe it as less integrated and less customizable than the gem.