iPad app with support for Apple Pencil and offline reading

This is a pretty big feature especially for an open-source project, but here it is.

It would be great to have an iPad app where one could find a synced copy of their library to read offline, and annotate with the Apple Pencil (and have those annotations by synced). This is the one thing keeping me using ReadCube still.

[The poll was here but I did not have permission to make one]