Launched BookKraft AI today-curious how other authors/makers handle KDP formatting rejections

Hey everyone — BookKraft AI launched on Product Hunt today.

It's a browser-based toolkit for indie authors that handles the part of publishing most people discover too late: getting a manuscript technically ready for KDP, Apple Books, and other stores. EPUB validation, Kindle formatting, metadata building, manuscript cleanup — it runs before tools like Vellum or Atticus, not instead of them. Five tools are free with no signup, rest is one-time payment (no subscription), and AI credits never expire. Genuinely curious — for those of you who've self-published or built tools in this space, what was the most annoying formatting/rejection issue you ran into with KDP? Trying to figure out what to build next.

https://www.producthunt.com/products/book-kraft-ai?launch=bookkraft-ai