# Chronos Authenticator vs Synctrain

The clearest difference is update cadence: Chronos Authenticator at every 6 days against Synctrain's every 6 weeks. Chronos Authenticator also leads on review sentiment (100% vs 89%). Synctrain's advantage is ratings volume (123 vs 3) and device support (3 vs 1). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Chronos Authenticator against 4.9 for Synctrain. That said, the two scores are not equally well evidenced: Synctrain has 123 ratings behind it against 3, so its average is the more settled of the two. Written reviews are what separate them: 100% of Chronos Authenticator's written reviews are positive against 89% of Synctrain's.

Chronos Authenticator ships an update every 6 days, Synctrain every 6 weeks. The most recent releases landed on September 16, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Chronos Authenticator | Synctrain |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/chronos-authenticator/id6503929490/reviews)** | [4.9 (123 ratings)](https://appshunter.io/ios/app/synctrain/id6553985316/reviews) |
| Number of ratings | 3 | **123** |
| Positive reviews | **100.0% of reviews** | 89.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 11 MB | 33 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Joel-David Wong](https://appshunter.io/developer/1750409239) | [T-Shaped](https://appshunter.io/developer/1758051723) |

## What reviewers say

### Chronos Authenticator

[App page](https://appshunter.io/ios/app/chronos-authenticator/id6503929490)

This open-source app provides secure two-factor authentication using time-based and counter-based methods. It offers end-to-end encryption for token data and optional iCloud backup and sync for convenience. Easily import and export your authentication tokens.

**Highlights:** Open-source, End-to-end encrypted token storage, Optional iCloud backup and sync, Token export and import, Anonymous usage (no account required)

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Chronos Authenticator free?

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

### Is Synctrain free?

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

### Which has better reviews, Chronos Authenticator or Synctrain?

Chronos Authenticator is rated higher. Chronos Authenticator averages 5.0 out of 5 from 3 ratings, while Synctrain averages 4.9 from 123 ratings.

### Do Chronos Authenticator or Synctrain have ads?

Neither Chronos Authenticator nor Synctrain shows ads.

### Which is updated more often, Chronos Authenticator or Synctrain?

Chronos Authenticator ships an update every 6 days, and Synctrain every 6 weeks. Most recently, Chronos Authenticator was updated on September 16, 2026 and Synctrain on September 28, 2026.

---

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