Strongbox vs Möbius Sync
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Strongbox
Securely store and manage all your passwords with one master password. Supports open-source formats and offers advanced security features like biometric unlock and YubiKey protection. Includes password auditing and cloud syncing for easy access.
- Biometric unlock (Face ID/Touch ID)
- Passkey support
- YubiKey protection
- Password auditing (Have I Been Pwned?)
- Cloud syncing (iCloud, Dropbox, Google Drive)
- Secure password generation
- TOTP Two Factor Authentication codes
Read full descriptionHide full description
Strongbox is an application for keeping all your passwords safely stored and protected by one master password. Supporting the open source Password Safe and KeePass formats. *** Features *** - Face ID/Touch ID Unlock for the ultimate in convenience, security and speed. - Passkey support - The latest, most convenient and most secure authentication method (passkeys). - PIN Code Unlock with a Duress PIN option for those tricky situations. - YubiKey protection - secure your databases with a hardware token. - Secure - protected by time tested military grade cryptography. - Private - Isolated In-App attachments viewer for your sensitive documents, photos & videos. - Audit your passwords - Automatically check your database for weak password including a 'Have I Been Pwned?' check. - Cloud Support, so you can access your cloud safes using iCloud, Dropbox, OneDrive, Google Drive, WebDAV or SFTP even when offline. Use the built in Files app for many other storage options or store them securely only on your local device. You choose your storage. - Search your entire set of passwords and secrets instantly and powerfully, with deep search. Autocomplete new entries, and auto generate secure passwords. - Compatible - Import/Export by Files app, Email, CSV, iTunes File Sharing or use cloud storage. - Standards compliant - using the time tested Password Safe and KeePass formats so you can import any existing password safe you have. - Features galore - Incredibly configurable password generation including Diceware (XKCD) & regular passwords. - Timed Auto Clear Clipboard. - Entry History. - KeePass Field References, Tags, Custom Icon & FavIcons (including automatic search & download). - Two Factor Authentication codes (TOTP) - QR Code, Steam & Manual. *** Strongbox is Freemium *** This means that Strongbox is free with a basic feature set, but if you like there are enhanced Pro features too. You can opt-in to a 90 day Free Trial of all the Pro features if you like, no obligations, but most find the Free version perfectly adequate. --------------------------------------------------------------------- • Strongbox provides In-App Purchases (both auto renewable subscriptions and one-off non-consumable) for Pro versions of the App • An outright/upfront (i.e. non In-App Purchase) option exists also, please see the Strongbox website for details. • Subscriptions are auto renewable with recurring billing. Cancel anytime. • The time period of the subscriptions are monthly, 3-monthly or yearly at users discretion • The user can also choose to purchase a 'Lifetime' one-off Pro version of the App • Payment will be charged to iTunes Account at confirmation of purchase • Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period • Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal • Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase • Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable • Strongbox Privacy Policy may be found here: https://strongboxsafe.com/privacy-policy/ • Strongbox Terms of Use may be found here: https://strongboxsafe.com/terms/
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).
Screenshots
Verdict
The clearest difference is rating: Strongbox at 4.7 against Möbius Sync's 3.8. Strongbox also leads on review sentiment (84% vs 55%) and update cadence (fortnightly vs every 2 months). On price, ads, in-app purchases and monetization model 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. Strongbox sells 14 in-app purchases, starting at $2.99 per month and Möbius Sync sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Strongbox holds the better App Store score, 4.7 against 3.8. That said, the two scores are not equally well evidenced: Strongbox has 4.1K ratings behind it against 140, so its average is the more settled of the two. Written reviews point the same way: 84% of Strongbox's written reviews are positive against 55% of Möbius Sync's.
Strongbox ships an update fortnightly, Möbius Sync every 2 months. The most recent releases landed on October 14, 2026 and October 3, 2026 respectively.
| Parameter | Strongbox | Möbius Sync |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (4.1K ratings) — better | 3.8 (140 ratings) |
| Positive reviews | 83.7% of reviews — better | 55.0% of reviews |
| Number of ratings | 4.1K — better | 140 |
| Update frequency | Fortnightly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Free with in-app purchases |
| Devices | iPhone, iPad, iPod, Mac, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 14.1 — better |
| Further details — not scored | ||
| Size | 145 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Phoebe Code Limited | Pickup Infinity Limited |
Customer experience
Strongbox
Möbius Sync
User reviews
Strongbox
From 4.1K App Store ratingsWhat we love
- 🚀 Seamless integration with iOS
- 🔒 Highly secure with end-to-end encryption
- 👍 Intuitive and user-friendly interface
- 🔒 Open-source and transparent
- 🚀 Reliable and stable performance
Room to improve
- 💰 Paid features can be expensive for some users
- 🐛 Occasional syncing and compatibility issues
- 💰 Lifetime license cost may be prohibitive
- 🐛 Bugs and crashes reported by some users
Möbius Sync
From 140 App Store ratingsWhat we love
- ✅ Effective Syncthing implementation for iOS
- 💰 Fair one-time purchase model (no subscription)
- 🔒 Privacy-focused peer-to-peer syncing
- 📱 Good Files app integration
- ⚡ Fast file synchronization when working
Room to improve
- 🐛 Outdated internal Syncthing version (1.28 vs 2.x)
- 💸 Aggressive paywall at 20MB free limit
- 🔌 No true background sync (iOS limitation)
- 🚫 Cannot sync iOS Photos app natively
- ⚠️ Inconsistent purchase restoration across devices
Bugs and requests
Strongbox
Reported bugs
2 issues- Crashes when using certain iOS versions
- Issues with database syncing and corruption
Requested features
4 requests- Ability to create custom templates and fields
- Improved organization and search functionality
- Tighter integration with Apple Keychain
- Support for more cloud storage providers
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
In-app purchases
Strongbox
- Strongbox Pro (Monthly)2 variants$2.991 Month
- Monthly Tip$2.991 Month
- Strongbox Pro (Yearly)3 Months trial$19.991 Year
Show 5 moreShow fewer
- Strongbox Pro (Yearly)1 Month trial$19.991 Year
- Yearly Tip$19.991 Year
- Strongbox Pro (Yearly)1 Year trial$24.991 Year
- Strongbox Pro (Yearly)3 Months trial$24.991 Year
- Strongbox Pro (Yearly)7 Days trial$24.991 Year
- Little Tip$4.99
- Small Tip$9.99
- Medium Tip$19.99
Show 3 moreShow fewer
- Large Tip$99.99
- Strongbox Pro (Lifetime)$99.99
- Huge Tip$199.99
Möbius Sync
- Unlimited file sync$4.99









