turn off a heroku app code example

Example 1: how to stop a heroku app

$ heroku ps:scale web=0
Scaling web processes... done, now running 0
//once ready to go back online:
heroku ps:scale web=1

Example 2: turn off heroku app

From The Heroku Webpage
Dashboard => Your App Name => Resources => Pencil icon=> Flip the switch => Confirm