Möbius Sync vs Karakeep App
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
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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).
Karakeep App
Effortlessly save links, notes, and images with automatic AI-powered tagging for quick retrieval. Search through all your saved content, including link contents, at blazing fast speeds. Organize your saved items into custom lists and share content from any app.
- Automatic AI tagging
- Full-text search
- Custom lists
- Sharing extension
- Save links, notes, and images
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Quickly save links, notes, and images and karakeep will automatically tag them for you using AI for faster retrieval. Content (including link contents) are indexed for blazing fast full text search. Organize you items into custom lists. Sharing extension to hoard items from any other apps.
Screenshots
Verdict
The clearest difference is rating: Karakeep App at 4.6 against Möbius Sync's 3.8. Karakeep App also leads on in-app purchases (none vs 1) and review sentiment (69% vs 55%). Möbius Sync's advantage is ratings volume (140 vs 43) and iOS requirement (14.1 vs 16.4). On price, update cadence, 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. Karakeep App asks for nothing beyond the download.
Karakeep App holds the better App Store score, 4.6 against 3.8. Both are backed by a comparable volume of ratings — 140 and 43 respectively. Written reviews point the same way: 55% of Möbius Sync's written reviews are positive against 69% of Karakeep App's.
Möbius Sync ships an update every 2 months, Karakeep App every 6 weeks. The most recent releases landed on September 20, 2026 and September 21, 2026 respectively.
| Parameter | Möbius Sync | Karakeep App |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (140 ratings) | 4.6 (43 ratings) — better |
| Positive reviews | 55.0% of reviews | 68.8% of reviews — better |
| Number of ratings | 140 — better | 43 |
| Update frequency | Every 2 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 14.1 — better | 16.4 |
| Further details — not scored | ||
| Size | 23 MB | 64 MB |
| Age rating | 4+ | 17+ |
| Developer | Pickup Infinity Limited | Mohamed Bassem |
Customer experience
Möbius Sync
Karakeep App
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
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- 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
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- 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
Karakeep App
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Möbius Sync
- Unlimited file sync$4.99
Karakeep App
No in-app purchases
