I was trying to understand your question better.
There are two ways to build software for it:
One:
https://www.invisible-computers.com/invisible-calendar/image...
Two:
https://github.com/Invisible-Computers/image-gallery/blob/ma...
Both of these require rendering the content via an HTTP endpoint and both of these currently only work together with the device backend.
> I can buy an ESP32 e-ink screen and run esphome or any of several other open source projects and put a piece of wood on the front of it, too.
Yes, you can! And if you do this, you have absolutely no need to use my e-paper smart screen.
(Though, for the record, it's not just a piece of wood in front, it's a CNC'd frame)