Notifications are a typical cross-cutting concern shared by many web applications. The Noticed gem makes developing notifications fantastically easy by providing a database-backed model and pluggable delivery methods for your Ruby on Rails application. It comes with built-in support for mailers, websockets, and a couple of other delivery methods. We'll also examine the merits of using the CableReady gem for triggering system notifications in your Ruby on Rails application. Let's get into it!