Chronos Authenticator vs Synctrain
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Chronos Authenticator
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.
- Open-source
- End-to-end encrypted token storage
- Optional iCloud backup and sync
- Token export and import
- Anonymous usage (no account required)
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Chronos is an open-source two-factor authentication (2FA) app designed to deliver robust security and reliable backup features. It supports both time-based (TOTP) and counter-based (HOTP) authentication methods. Features: • Open-source • End-to-end encrypted: Only encrypted token data is stored on the device and in iCloud • Backup & Sync (optional): Effortlessly backup and sync your data with iCloud • Export Tokens: Easily export your tokens for backup or transfer • Import Tokens: Easily import your tokens from other authenticators • Anonymous: No telemetry & app account required
Synctrain
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.
- Secure file synchronization
- Full folder synchronization
- Specific file selection
- Audio and video streaming
- Cross-device file mirroring
- Customizable sharing permissions
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With Synctrain you can securely synchronize files with other devices that have Syncthing installed. You can choose to synchronize full folders, or choose specific files. With Synctrain you can also stream audio and video files from other devices. When you synchronize files, all changes, including deleting files, also happen on your other devices. Do not use Synctrain for back-up purposes, and always keep a back-up of your data. You decide with which devices you share which files. This also means the app makers cannot help you access or recover any lost files. This app is powered by Syncthing. This app is however not associated with or endorsed by Syncthing nor its developers. Please do not expect support from the Syncthing developers. Instead, contact the maker of this app if you have questions.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Chronos Authenticator | Synctrain |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | 4.9 (123 ratings) |
| Positive reviews | 100.0% of reviews — better | 89.5% of reviews |
| Number of ratings | 3 | 123 — better |
| Update frequency | Every 6 days — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone | iPhone, iPad, Mac — better |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 11 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | Joel-David Wong | T-Shaped |
Customer experience
Chronos Authenticator
Synctrain
Bugs and requests
Chronos Authenticator
Not enough reviews yet to summarise bugs or requests.
Synctrain
Reported bugs
2 issues- Occasional app crashes
- Sync delays on some devices
Requested features
2 requests- Direct photo/video sync to remote devices
- Faster initial connection to server
In-app purchases
Chronos Authenticator
No in-app purchases
Synctrain
No in-app purchases
Questions
Is Chronos Authenticator free?
Is Synctrain free?
Which has better reviews, Chronos Authenticator or Synctrain?
Do Chronos Authenticator or Synctrain have ads?
Which is updated more often, Chronos Authenticator or Synctrain?
Other comparisons
