# Synctrain vs Sealed Letter

The clearest difference is in-app purchases: Synctrain at none against Sealed Letter's 2. Sealed Letter's advantage is update cadence (fortnightly vs every 6 weeks) and iOS requirement (15.0.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Sealed Letter sells 2 in-app purchases, starting at $0.99 per month. Synctrain asks for nothing beyond the download.

Synctrain ships an update every 6 weeks, Sealed Letter fortnightly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Synctrain | Sealed Letter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (142 ratings)](https://appshunter.io/ios/app/synctrain/id6553985316/reviews)** | — |
| Number of ratings | **142** | — |
| Positive reviews | 89.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Fortnightly** |
| Monetization | Free | — |
| Size | 33 MB | 30 MB |
| Requires iOS | 17.0 | **15.0.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [T-Shaped](https://appshunter.io/developer/1758051723) | [Continuia OU](https://appshunter.io/developer/1864678999) |

## What reviewers say

### Synctrain

[App page](https://appshunter.io/ios/app/synctrain/id6553985316)

Securely synchronize files and folders between your devices. Stream audio and video directly from other devices.  Manage file sharing permissions to control access to your data.

**Highlights:** Secure file synchronization, Full folder synchronization, Specific file selection, Audio and video streaming, Cross-device file mirroring, Customizable sharing permissions

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Intuitive interface
- 🚀 Seamless sync between devices
- 🔓 Open-source and free
- 💡 Integrates with iOS Files app

**What reviewers complain about**

- 🐛 Occasional connection issues
- 🔍 Could use more Apple-like design

**Reported bugs**

- Occasional app crashes
- Sync delays on some devices

**Requested features**

- Direct photo/video sync to remote devices
- Faster initial connection to server


### Sealed Letter

[App page](https://appshunter.io/ios/app/sealed-letter/id6757117266)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sealed Letter Subscription | $0.99 | per month |
| Sealed Letter Subscription | $9.99 | per year |


## Frequently asked questions

### Is Synctrain free?

Synctrain is free to download, with no in-app purchases.

### Is Sealed Letter free?

Sealed Letter is free to download, with in-app purchases available.

### Do Synctrain or Sealed Letter have ads?

Neither Synctrain nor Sealed Letter shows ads.

### Which is updated more often, Synctrain or Sealed Letter?

Synctrain ships an update every 6 weeks, and Sealed Letter fortnightly. Most recently, Synctrain was updated on October 24, 2026 and Sealed Letter on October 24, 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.*