# SOS Environment vs HN CTV

The clearest difference is update cadence: SOS Environment at fortnightly against HN CTV'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.

SOS Environment ships an update fortnightly, HN CTV every 6 weeks. The most recent releases landed on November 3, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | SOS Environment | HN CTV |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 6 weeks |
| Monetization | Free | — |
| Size | 74 MB | 49 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Vietnam Environmental Incident Response Center](https://appshunter.io/developer/1577527616) | [HUNONIC VIET NAM JOINT STOCK COMPANY](https://appshunter.io/developer/1422372871) |

## What reviewers say

### SOS Environment

[App page](https://appshunter.io/ios/app/sos-environment/id1577527614)

This app allows citizens to quickly report oil and chemical spills to relevant authorities. It also helps manage incident response capabilities and provides access to legal documents and training resources.

**Highlights:** Report oil and chemical spills, Locate incident positions, Provide safety guidance, Manage response capabilities database, Integrate with real-time weather data, Access legal library for oil and chemical regulations, Online training for incident response

**Features:** macOS Compatibility

**In-app purchases:** none


### HN CTV

[App page](https://appshunter.io/ios/app/hn-ctv/id1582425827)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SOS Environment free?

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

### Is HN CTV free?

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

### Do SOS Environment or HN CTV have ads?

Neither SOS Environment nor HN CTV shows ads.

### Which is updated more often, SOS Environment or HN CTV?

SOS Environment ships an update fortnightly, and HN CTV every 6 weeks. Most recently, SOS Environment was updated on November 3, 2026 and HN CTV on October 27, 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.*