ePub Compatibility Checker

TL;DR

A technical diagnostic for authors whose ePubs work everywhere except Kobo because of Adobe's aging DRM and formatting standards.

Who is this actually for?

Self-published authors and small digital presses getting customer support complaints from Kobo users despite having 'valid' files.

The Good

• Stops you from losing your mind trying to fix code that isn't actually broken.
• Exposes the technical debt and proprietary mess hiding inside Adobe's digital publishing ecosystem.

The Catch (Potential Downsides)

It identifies the source of the headache but doesn't offer a one-click automated fix. You still have to do the manual labor of re-encoding or stripping metadata to appease specific hardware.