Comparison

Strongbox 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

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.

Highlights
  • 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
Features
Read 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/

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

Strongbox4 screens
Möbius Sync1 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Strongbox ships an update fortnightly, Möbius Sync every 2 months. The most recent releases landed on October 14, 2026 and October 3, 2026 respectively.

Scorecard5 real differences · 5 level
Strongbox versus Möbius Sync: the parameters behind the verdict, then further details
ParameterStrongboxMöbius Sync
PriceFreeFree
Rating4.7 (4.1K ratings) — better3.8 (140 ratings)
Positive reviews83.7% of reviews — better55.0% of reviews
Number of ratings4.1K — better140
Update frequencyFortnightly — betterEvery 2 months
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac, Apple Watch — betteriPhone, iPad, iPod
Requires iOS15.014.1 — better
Further details — not scored
Size145 MB23 MB
Age rating4+4+
DeveloperPhoebe Code LimitedPickup Infinity Limited

Customer experience

Strongbox

All ratings4,065 ratings
Positive94.1%
Neutral1.8%
Negative4.1%
Written reviews565 reviews
Positive83.7%
Neutral4.2%
Negative12.0%

Möbius Sync

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

User reviews

Strongbox

From 4.1K App Store ratings

What 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 ratings

What 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 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

14 purchases

Strongbox

Subscriptions8
  • Strongbox Pro (Monthly)2 variants$2.991 Month
  • Monthly Tip$2.991 Month
  • Strongbox Pro (Yearly)3 Months trial$19.991 Year
Show 5 more
  • 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
One-time6
  • Little Tip$4.99
  • Small Tip$9.99
  • Medium Tip$19.99
Show 3 more
  • Large Tip$99.99
  • Strongbox Pro (Lifetime)$99.99
  • Huge Tip$199.99
1 purchases

Möbius Sync

One-time1
  • Unlimited file sync$4.99

Questions

Is Strongbox free?
Strongbox is free to download, with in-app purchases available.
Is Möbius Sync free?
Möbius Sync is free to download, with in-app purchases available.
Which has better reviews, Strongbox or Möbius Sync?
Strongbox is rated higher. Strongbox averages 4.7 out of 5 from 4.1K ratings, while Möbius Sync averages 3.8 from 140 ratings.
Do Strongbox or Möbius Sync have ads?
Neither Strongbox nor Möbius Sync shows ads.
Which is updated more often, Strongbox or Möbius Sync?
Strongbox ships an update fortnightly, and Möbius Sync every 2 months. Most recently, Strongbox was updated on October 14, 2026 and Möbius Sync on October 3, 2026.

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