Comparison

Strongbox Pro vs Möbius Sync

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Strongbox Pro

Securely store and protect all your passwords with one master password. Supports open-source formats and offers advanced security features like biometric unlock, hardware token protection, and cloud syncing.

Highlights
  • Master password protection
  • Biometric unlock (Face ID/Touch ID)
  • Passkey and YubiKey support
  • Military-grade encryption
  • Cloud sync (iCloud, Dropbox, etc.)
  • Password auditing (weak passwords, HIBP check)
  • Secure password generation
Features
Read full description

Strongbox Pro is available here for outright and upfront purchase instead of via an In-App Purchase upgrade. This version of Strongbox is identical to the much loved Strongbox application with all the Pro features and the same regular update schedule. 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. *** Supports Family Sharing *** *** Features *** - Face ID/Touch ID Unlock for the ultimate in convenience, security and speed. - PIN Code Unlock with a Duress PIN option for those tricky situations. - Passkey support - The latest, most convenient and most secure authentication method (passkeys). - 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 passwords 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. --------------------------------------------------------------------- • Payment will be charged to iTunes Account at confirmation of purchase • Strongbox Privacy Policy may be found here: https://strongboxsafe.com/privacy-policy/ • Strongbox Terms of Use may be found here: https://strongboxsafe.com/terms/

About

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.

Highlights
  • 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
Features
Read 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

Strongbox Pro4 screens
Möbius Sync1 screens

Verdict

The call

The clearest difference is price: Möbius Sync at Free against Strongbox Pro's $99.99. Strongbox Pro's advantage is rating (4.7 vs 3.8) and review sentiment (86% vs 55%). On ratings volume, ads, in-app purchases and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Möbius Sync is free to download; Strongbox Pro costs $99.99 up front. Strongbox Pro sells 7 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.

ReceptionRating · Positive reviews · Number of ratings

Strongbox Pro holds the better App Store score, 4.7 against 3.8. Both are backed by a comparable volume of ratings — 338 and 140 respectively. Written reviews point the same way: 86% of Strongbox Pro's written reviews are positive against 55% of Möbius Sync's.

UpkeepUpdate frequency

Strongbox Pro ships an update every 2 weeks, Möbius Sync every 2 months. The most recent releases landed on October 13, 2026 and October 3, 2026 respectively.

Scorecard6 real differences · 4 level
Strongbox Pro versus Möbius Sync: the parameters behind the verdict, then further details
ParameterStrongbox ProMöbius Sync
Price$99.99Free — better
Rating4.7 (338 ratings) — better3.8 (140 ratings)
Positive reviews85.8% of reviews — better55.0% of reviews
Number of ratings338 — better140
Update frequencyEvery 2 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesYesYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod, Mac, Apple Watch — betteriPhone, iPad, iPod
Requires iOS15.014.1 — better
Further details — not scored
Size136 MB23 MB
Age rating4+4+
DeveloperPhoebe Code LimitedPickup Infinity Limited

Customer experience

Strongbox Pro

All ratings338 ratings
Positive93.5%
Neutral0.9%
Negative5.6%
Written reviews225 reviews
Positive85.8%
Neutral3.6%
Negative10.7%

Möbius Sync

All ratings140 ratings
Positive67.9%
Neutral8.6%
Negative23.6%
Written reviews171 reviews
Positive55.0%
Neutral14.0%
Negative31.0%

Bugs and requests

Strongbox Pro

Not enough reviews yet to summarise bugs or 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 more
  • 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 more
  • 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

7 purchases

Strongbox Pro

Subscriptions2
  • Monthly Tip$2.991 Month
  • Annual Tip$19.991 Year
One-time5
  • Little Tip$4.99
  • Small Tip$9.99
  • Medium Tip$19.99
Show 2 more
  • Large Tip$99.99
  • Huge Tip$199.99
1 purchases

Möbius Sync

One-time1
  • Unlimited file sync$4.99

Questions

Is Strongbox Pro free?
Strongbox Pro costs $99.99, and also offers in-app purchases.
Is Möbius Sync free?
Möbius Sync is free to download, with in-app purchases available.
Which has better reviews, Strongbox Pro or Möbius Sync?
Strongbox Pro is rated higher. Strongbox Pro averages 4.7 out of 5 from 338 ratings, while Möbius Sync averages 3.8 from 140 ratings.
Do Strongbox Pro or Möbius Sync have ads?
Neither Strongbox Pro nor Möbius Sync shows ads.
Which is updated more often, Strongbox Pro or Möbius Sync?
Strongbox Pro ships an update every 2 weeks, and Möbius Sync every 2 months. Most recently, Strongbox Pro was updated on October 13, 2026 and Möbius Sync on October 3, 2026.

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