# Strongbox Pro vs Möbius Sync

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.

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.

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.

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.

## The numbers

| Metric | Strongbox Pro | Möbius Sync |
| --- | --- | --- |
| Price | $99.99 | **Free** |
| Rating | **[4.7 (338 ratings)](https://appshunter.io/ios/app/strongbox-pro/id1481853033/reviews)** | [3.8 (140 ratings)](https://appshunter.io/ios/app/mobius-sync/id1539203216/reviews) |
| Number of ratings | **338** | 140 |
| Positive reviews | **85.8% of reviews** | 55.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 136 MB | 23 MB |
| Requires iOS | 15.0 | **14.1** |
| Devices | **iPhone, iPad, iPod, Mac, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Phoebe Code Limited](https://appshunter.io/developer/897283734) | [Pickup Infinity Limited](https://appshunter.io/developer/1118833408) |

## What reviewers say

### Strongbox Pro

[App page](https://appshunter.io/ios/app/strongbox-pro/id1481853033)

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:** Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Tip | $2.99 | per month |
| Annual Tip | $19.99 | per year |
| Little Tip | $4.99 | one-time |
| Small Tip | $9.99 | one-time |
| Medium Tip | $19.99 | one-time |
| Large Tip | $99.99 | one-time |
| Huge Tip | $199.99 | one-time |


### Möbius Sync

[App page](https://appshunter.io/ios/app/mobius-sync/id1539203216)

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:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited file sync | $4.99 | one-time |

**What reviewers like**

- ✅ 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

**What reviewers complain about**

- 🐛 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

**Reported bugs**

- 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

**Requested features**

- 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


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*