Möbius Sync vs Bibliocapsa
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Möbius Sync
Synchronize files between your iOS devices and other Syncthing-supported platforms without relying on cloud storage. Manage multiple folders and remote devices, with options for sandbox or experimental cross-app sandbox syncing.
- File synchronization between iOS and other Syncthing devices
- No cloud service required
- Supports multiple folders and remote devices
- Sync within app sandbox or other app sandboxes (paid)
- Uses open-source Syncthing engine
Read full descriptionHide full description
Möbius Sync brings Syncthing to your iPhone or iPad, allowing you to synchronize selected files between iOS devices and other devices supported by Syncthing, without the need for any cloud service. Supports multiple folders and multiple remote devices. Synchronized folders can be created either: 1. in the Möbius Sync sandbox and files can be added to and retrieved from shared folders via the iOS Files app; or 2. (PAID feature) by accessing other apps' sandboxes. This feature is EXPERIMENTAL and may break other app's functionality. Uses the open-source Syncthing engine internally. Usage within the Möbius Sync sandbox is free up to 20MB. Unlimited file sync, including files in other apps' sanboxes is available for a one-time purchase. NOTE: The functionality unlocked by in-app purchase is identical to that in Möbius Sync Pro (which is purchased up-front).
Bibliocapsa
Organize your physical and digital book collection with this private library app. Easily catalog books by scanning covers or barcodes, track reading progress, and manage your collection with custom shelves and stats. Enjoy a clean interface with customizable themes and icons.
- Catalog books via barcode scan or cover snap
- Track physical and digital copies
- Organize with custom shelves
- Search entire library
- View reading statistics
- Optional server connection for advanced users
Read full descriptionHide full description
Bibliocapsa is a beautiful, private home for your books, both the ones on your shelves and the ones on your devices. CATALOG EVERYTHING • Scan a barcode or snap a cover to add a book in seconds. Bibliocapsa identifies it and fills in the details. • Track physical and digital copies, and mark the same book as both. • Organize with shelves, search your whole library, and follow your reading stats. • A clean cover grid, multiple app icons, and themes. YOURS AND PRIVATE • Your library lives on your device, optionally synced across your devices through your own private iCloud. • No accounts. No ads. No tracking. Ever. CONNECT YOUR SERVER (optional, for power users) • Pair Bibliocapsa with your own self-hosted Bibliocapsa/Calibre library to read EPUBs in the app, sync your digital catalog, and keep KOReader reading progress in step. Whether you just want to remember what's on your shelf or you run a full self-hosted library, Bibliocapsa keeps your books organized and entirely yours.
Screenshots
Verdict
The clearest difference is review sentiment: Bibliocapsa at 100% against Möbius Sync's 55%. Bibliocapsa also leads on rating (5.0 vs 3.8) and in-app purchases (none vs 1). Möbius Sync's advantage is ratings volume (140 vs 1) and iOS requirement (14.1 vs 17.0). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Möbius Sync sells 1 one-off in-app purchase. Bibliocapsa asks for nothing beyond the download.
Bibliocapsa holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: Möbius Sync has 140 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 55% of Möbius Sync's written reviews are positive against 100% of Bibliocapsa's.
Möbius Sync ships an update every 2 months, Bibliocapsa fortnightly. The most recent releases landed on October 3, 2026 and September 30, 2026 respectively.
| Parameter | Möbius Sync | Bibliocapsa |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (140 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 55.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 140 — better | 1 |
| Update frequency | Every 2 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 23 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Pickup Infinity Limited | John Worthington |
Customer experience
Möbius Sync
Bibliocapsa
Bugs and requests
Möbius Sync
Reported bugs
16 issues- Syncthing version incompatibility with v2.x devices
- Device discovery limited to 1 of 5 paired devices
- Insufficient space errors despite available storage
- Purchase dialog rendering issues on older devices
- Purchase not persisting after app reinstall
Show 11 moreShow fewer
- Settings reset after app updates
- External folder bookmark path cannot be changed
- .stfolder sync failures and naming conflicts
- Sync hangs at intermediate percentages
- Files not appearing in designated folders despite sync confirmation
- App crashes and becomes unresponsive
- Language preference not saved between sessions
- Syncthing disabled errors with no explanation
- Quick Sync feature not working reliably
- Accessibility issues with VoiceOver
- App storage consuming excessive disk space (10GB+)
Requested features
15 requests- Update internal Syncthing to version 2.x or higher
- iOS Photos app sync capability (at least one-way upload)
- True background synchronization
- Selective folder sync to save storage space
- File Provider extension for deeper iOS integration
Show 10 moreShow fewer
- Widget for continuous background operation
- Photo library backup functionality
- Family sharing support for purchases
- Better UI/UX with custom frontend instead of web interface
- Automatic sync without manual app opening
- Support for untrusted devices
- Folder encryption support
- Location-based sync triggers
- More frequent Syncthing core updates
- Better documentation and setup guides
Bibliocapsa
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Möbius Sync
- Unlimited file sync$4.99
Bibliocapsa
No in-app purchases
