John O'Keefe
3feb608d26
- sync-guide matching ladder was missing rung 8: Title only at 0.3 confidence, last-resort after title+author+size (book_matching.go priorities 1-8, file-path priority handled at the API layer). - library-browsing said the sort dropdown had 'more' options than it does: exactly five (Title A-Z/Z-A, Author A-Z, Date Added, Page Count). Sweep results, all verified against source: themes.md 24+13=37 exact (web/src/theme.ts union), reader-guide claims (corner zones, selection copy, comics annotations disabled - bookmarks only) present in web/src/reader/reader.ts, android-app.md strings (local-network permission, login error table) in bookhoard-app source, calibre dc:title/calibre:series parsing in media_scanner_calibre fixtures.
136 lines
5.6 KiB
Markdown
136 lines
5.6 KiB
Markdown
# Universal Sync — how your devices stay in step
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Sync is the promise that makes Bookhoard more than a web page: read on
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whatever is in your hands, and every other device catches up. One server
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holds the truth for each book — your position, bookmarks, highlights, and
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notes — and every registered device pushes and pulls against it.
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## Supported devices today
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| Platform | Status | How it syncs |
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| --- | --- | --- |
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| **Web browser** | ✅ Fully supported | Live, as you read — the reader saves position and annotations continuously |
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| **Android app** | ✅ Fully supported | The native client: progress, highlights, bookmarks, notes; reads offline and queues changes until you are back online |
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| **KOReader** (Kindle, Kobo, PocketBook) | ✅ Fully supported | The Bookhoard KOReader plugin, over Wi-Fi |
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| **Kobo, stock firmware** | 🚧 Server support complete | The native Kobo protocol is implemented and documented server-side; device-side enablement is the remaining piece — [Kobo Setup](devices/kobo-setup.md) has the details |
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Kindle and reMarkable are under consideration; KOReader already covers
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several of those devices today.
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## Getting a device into the circle
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1. Connect the device to your server (each guide above walks its own path)
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2. Approve the pending registration on the **Devices** page — the Android
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app registers itself on first login; KOReader asks from its plugin
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3. Done. Sync starts as soon as a device is approved
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The **Devices** page is mission control: see every registered device and
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when it was last seen, remove a device (revoking its access instantly), and
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work through **unlinked books** — device files that could not be matched to
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a library book yet.
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## Book matching
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When a device reports a book, Bookhoard tries to match it to your library
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by fingerprint, strongest first:
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1. **Bookhoard UUID** — 100% confidence
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2. **OPF UUID** — 95%
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3. **SHA-256 hash** — 90%
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4. **OPF identifier** — 85%
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5. **ISBN / ASIN** — 80%
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6. **Title + Author + file size** — 50%
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7. **Title only** — 30% (last resort, only tried when nothing else matched)
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Books that match automatically never bother you. The ones that can't
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(side-loaded files, converted formats like EPUB → KEPUB, mismatched
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metadata) land in the device's **unlinked books** list, where you can:
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- **Auto-link** everything above a confidence threshold
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- Review **suggestions** first, then link
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- **Link by hand** — pick the right library book yourself
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## What syncs
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**Reading progress** — page, percentage, chapter position, EPUB CFI, last
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read time. EPUBs sync by percentage and CFI, PDFs and comics by page, so
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the same book lines up on devices with different page counts.
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**Highlights and notes** — the highlighted text, your note, its color, and
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where it sits. Locations are stored in several forms at once (page, EPUB
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CFI, percentage, character offset), which is why a highlight made on your
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phone lands in the right place on an e-reader with different pagination.
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**Bookmarks** — location, title, and when you made them.
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Everything above is per-user and private: your devices see your data
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because you approved them, other users see theirs, and revoking a device
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ends its access on the spot.
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## Conflicts
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If the same book is read on two devices close together, Bookhoard does not
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silently pick a winner — it records a **sync conflict** and shows it to
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you:
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- The book's detail page grows a **Sync Progress** button (with a
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"Progress conflict detected" notice)
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- The **Conflicts** page (`/conflicts`) lists everything unresolved
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Resolving means choosing a strategy: keep one side's progress, keep the
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server's current value, or let the **furthest progress win**. Until you
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resolve, the conflict stays listed — nothing is lost, it just waits for
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your call.
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## Offline reading
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Devices keep working without the server. The Android app reads fully
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offline and queues your changes, draining the queue when you reconnect.
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E-readers push their progress on the next connection. The server holds a
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per-device queue for inbound work and retries failures automatically; if
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items pile up (a device offline for weeks), an admin can retry or clear a
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device's queue from the server side.
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## Reading history
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Every reading session is logged — when, how long, on which device — and
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feeds your [dashboard](dashboard.md) and stats. Your history is visible on
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the **Progress** page and on each book's detail page, and it is yours
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alone.
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## Troubleshooting
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**Progress not updating**
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Check the device is still on the **Devices** page and was approved; check
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the server URL in the device's settings; confirm the device can reach the
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server (open the server URL in the device's browser as a test).
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**"Device not found"**
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The device was removed or its token revoked — register it again and
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approve it.
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**A conflict keeps coming back**
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Two devices are genuinely fighting over the same book. Decide which device
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is the reader for that book, resolve with a strategy above, and avoid
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simultaneous reading of the same title.
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**High battery or data use**
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That is the cost of continuous sync on a chatty device; e-reader plugins
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let you space out their sync checks from the plugin's own settings.
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## Device limits
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Each account has a device limit — **10 by default**, and administrators can
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raise or lower it per user. Removing a device you no longer use frees a
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slot.
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---
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More detail on any device lives in its guide:
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[Android](devices/android-app.md) ·
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[KOReader](devices/koreader-setup.md) ·
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[Kobo](devices/kobo-setup.md) ·
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[Calibre import](calibre-integration.md) ·
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and the [filter rules](filters/index.md) that power matching-adjacent
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shelves like [smart collections](collections.md).
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