# IMPACT vs 衞生署DH

The clearest difference is ads: IMPACT at none against 衞生署DH's shown. IMPACT also leads on monetization model (free vs ad-supported) and iOS requirement (13.0 vs 15.1). 衞生署DH's advantage is review sentiment (100% vs 67%). On price, update cadence, 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.

IMPACT ships an update every 3 months, 衞生署DH every 2 months. The most recent releases landed on June 25, 2026 and June 7, 2026 respectively.

## The numbers

| Metric | IMPACT | 衞生署DH |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Ad-supported |
| Size | 114 MB | 44 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Infection Control Branch, Centre for Health Protection, Department Of Health, HKSAR](https://appshunter.io/developer/592326133) | [Department of Health, HKSARG](https://appshunter.io/developer/1710352553) |

## What reviewers say

### IMPACT

[App page](https://appshunter.io/ios/app/impact/id592326130)

This medical reference app provides health professionals with guidelines on appropriate antimicrobial drug use. It incorporates the latest scientific evidence and local pathogen data to combat antimicrobial resistance and improve patient care.

**Highlights:** Antimicrobial drug usage guidelines, Empirical therapy for infections, Treatment of infections with known pathogens, Surgical prophylaxis data, Pathogen prevalence and sensitivity patterns, Safe antibiotic use tips, Penicillin allergy management

**Features:** macOS Compatibility

**In-app purchases:** none


### 衞生署DH

[App page](https://appshunter.io/ios/app/dh/id6468657794)

This app offers a comprehensive public health information portal with e-services and resources. It features license validation, mental health support, health tips, event calendars, and various health tools. It's designed for healthcare professionals, institutions, and the general public seeking health information and services.

**Highlights:** License scanner and validation, Mental health chatbot support, Public health tips and updates, Event calendar for health programs, Access to e-forms and health tools, Information on vaccination and dental services

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is IMPACT free?

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

### Is 衞生署DH free?

衞生署DH is free to download, with no in-app purchases.

### Do IMPACT or 衞生署DH have ads?

衞生署DH shows ads; IMPACT does not.

### Which is updated more often, IMPACT or 衞生署DH?

IMPACT ships an update every 3 months, and 衞生署DH every 2 months. Most recently, IMPACT was updated on June 25, 2026 and 衞生署DH on June 7, 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.*