Kios, an iOS reader that syncs with a self-hosted Kobo library
An iOS reading app that loads books from a self-hosted Kobo or Calibre-Web server and syncs progress, built largely with Claude Code.
Credits
Earliest dated source:
The full story
The maker reads on a Kobo pointed at a self-hosted book server such as Calibre-Web, and wanted an iPhone app that could load the same books and sync reading progress over the Kobo protocol. Kios does that, and also supports kosync and OPDS with progress sync.
An experienced developer but new to iOS, they leaned heavily on Claude Code with Opus 4.8, and even had Claude write them a "book" on how iOS development works so they could review the code rather than just accept it. The app is in testing on TestFlight.
How it was done
Tools
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Sources
From a short post by the maker, so the details are as they tell them.
- Reddit: I built Kios — an iOS reader for your self-hosted Kobo/Calibre library, with progress syncReddit poster: raphi011Posted
The maker's post on r/ClaudeAI.
If it disappears: archived copy of Reddit: I built Kios — an iOS reader for your self-hosted Kobo/Calibre library, with progress sync (opens in a new tab)
- The project: kios.raphi011.dev
The project page.