One Self-Hosted Place That Syncs Reading Progress, Highlights, And Notes Across KOReader, Kindle, And The Web Instead Of Duct-Taping Four Tools Together
People who self-host their ebook library with Calibre-Web and read on KOReader can finally sync reading position, but highlights and notes still live on-device or require a separate desktop app plus manual plugins, and progress desyncs across different file formats of the same book. The niche wants one system where annotations and progress follow the reader everywhere and surface back in the web library, without a cloud subscription.
Do not rebuild progress sync, KOSync already won that. The real gap is a normalized annotation model that survives a book changing formats and renders in the web reader. Build the highlights layer on top of the existing KOSync protocol rather than forking it.
landscape (4 existing solutions)
Reading-position sync is basically a solved, commodity piece now. Unified highlights and notes sync that survives format changes and surfaces inside a self-hosted web library is not, so readers still glue together three or four separate tools to approximate it.