How to remove your Heroku account
Be logged in, then go to https://dashboard.heroku.com/account.
Click “Close your account” at the bottom, and confirm
Direct removal link: https://dashboard.heroku.com/account
Helpful Trick: Removing online data
Helpful Trick: Remove third-party logins
If you signed up for Heroku using a third-party login such as Facebook or Twitter, you probably want to revoke all access from Heroku. Click here to find out how.