They are free and do not count against your image limit.
Or bring your own
Name any image on a public registry and a box boots it — nothing to upload, build, or approve first:Use your own image
Start a box from any public registry, and see what gets recorded. Start here.
Pin a build
Make production boot the exact build you tested, and move it back when a release goes wrong.
Private images
Register a registry login once, then reference private images like any other.
The catalog
What is recorded when a box boots, and the limit it counts against.
Where to do what
Reach for the console to do something once. Reach for the SDK when it has to happen without you.

