Source: fetlife/rollout: Feature flippers.

Definitely an option worth considering over a database table.

There are quite a few options, like:

$rollout.activate_group(:chat, :all)
$rollout.activate_group(:chat, :admins)
$rollout.activate_user(:chat, @user)
$rollout.activate_percentage(:chat, 20)
$rollout.active?(:chat, User.first)

One question I have, though: Is there a drop-in Rails UI for Rollout feature toggles?

Edit: I clearly did not read the README closely enough. There are two linked: