# SOS Environment vs HPK BILL

The clearest difference is iOS requirement: HPK BILL at 13.0 against SOS Environment's 15.6. On price, update cadence, 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.

SOS Environment ships an update fortnightly, HPK BILL every 3 weeks. The most recent releases landed on October 11, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | SOS Environment | HPK BILL |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Free | — |
| Size | 74 MB | 29 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Vietnam Environmental Incident Response Center](https://appshunter.io/developer/1577527616) | [HPK TECHNOLOGY AND TRAINING JOINT STOCK COMPANY](https://appshunter.io/developer/1602033988) |

## 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


### HPK BILL

[App page](https://appshunter.io/ios/app/hpk-bill/id6476686160)

**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 HPK BILL free?

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

### Do SOS Environment or HPK BILL have ads?

Neither SOS Environment nor HPK BILL shows ads.

### Which is updated more often, SOS Environment or HPK BILL?

SOS Environment ships an update fortnightly, and HPK BILL every 3 weeks. Most recently, SOS Environment was updated on October 11, 2026 and HPK BILL on October 25, 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.*