# CDT VN vs VTC VSS

The clearest difference is update cadence: CDT VN at every 2 days against VTC VSS's every 6 weeks. On price, ads, in-app purchases and device support there is nothing between them.

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

CDT VN ships an update every 2 days, VTC VSS every 6 weeks. The most recent releases landed on October 19, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | CDT VN | VTC VSS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 15.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 6 weeks |
| Monetization | Free | — |
| Size | 70 MB | 253 MB |
| Requires iOS | 15.5 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [GEOGRAPHY SOFTWARE JOINT STOCK COMPANY](https://appshunter.io/developer/1148381187) | [VTC Telecom](https://appshunter.io/developer/1419367682) |

## What reviewers say

### CDT VN

[App page](https://appshunter.io/ios/app/cdt-vn/id1469180146)

This system helps fishermen manage their catch logs, transfers, and port permits. It also assists processing plants in obtaining origin certificates for seafood products and enables authorities to oversee fishing and export activities.

**Highlights:** Catch log management, Fishing transfer tracking, Port entry/exit permits, Seafood origin certificates, Fishing and export data management

**Features:** Vision Pro support

**In-app purchases:** none


### VTC VSS

[App page](https://appshunter.io/ios/app/vtc-vss/id6752933075)

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

**In-app purchases:** none


## Frequently asked questions

### Is CDT VN free?

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

### Is VTC VSS free?

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

### Do CDT VN or VTC VSS have ads?

Neither CDT VN nor VTC VSS shows ads.

### Which is updated more often, CDT VN or VTC VSS?

CDT VN ships an update every 2 days, and VTC VSS every 6 weeks. Most recently, CDT VN was updated on October 19, 2026 and VTC VSS on October 28, 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.*