Its the only way I roll when it comes to ebooks

Actually its the only thing I’d like to find in an open comic reader for iOS (iPad, my only iOS device, work bought it for me). Panels supports it (paid version), but I have yet to find an open source solution for iOS that does (for comics specifically).

For android quite a few do out of the box. Definitely recommended.

I’d also recommend checking out a server that uses it to try it out. Calibre-server supports it if you want to check it out.

OPDS is the only real hard requirement for me in an eBook reader app.