Starting out with Heroku is free. Each app you create has free access to 750 dyno-hours per month and a starter-tier database. From there, you can extend your application with add-ons from our Add-ons Marketplace. To use any add-on, even free ones, you must first verify your account — we require this to prevent abuse. Also, some add-ons such as Heroku Scheduler are free to install, but may have charges for dyno-hour usage.
Unverified accounts are limited to 5 apps.