# UN Number vs Chemdata

The clearest difference is in-app purchases: Chemdata at none against UN Number's 5. UN Number's advantage is update cadence (every 3 months vs every 19 months) and iOS requirement (11.0 vs 14.0). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. UN Number sells 5 in-app purchases, starting at $1.99 per month. Chemdata asks for nothing beyond the download.

UN Number ships an update every 3 months, Chemdata every 19 months. The most recent releases landed on October 15, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | UN Number | Chemdata |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (54 ratings)](https://appshunter.io/ios/app/un-number/id307373793/reviews)** | — |
| Number of ratings | **54** | — |
| Positive reviews | 63.0% of reviews | **66.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 19 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 44 MB | 49 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [ZWEIDENKER Holding GmbH](https://appshunter.io/developer/307356444) | [Ricardo-AEA ltd](https://appshunter.io/developer/691094634) |

## What reviewers say

### UN Number

[App page](https://appshunter.io/ios/app/un-number/id307373793)

Quickly access essential information for hazardous materials emergencies. This reference guide provides detailed data based on established emergency response cards, usable even without an internet connection. It's designed for rapid retrieval of critical details in critical situations.

**Highlights:** Enter UN numbers via keypad, Quick information retrieval, Based on ERI-Cards, Offline functionality, Categorized data display, User-friendly interface

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| UN⁺ Monthly | $1.99 | per month |
| UN⁺ Yearly | $17.99 | per year |
| ADR Label | $0.99 | one-time |
| Hazard Diamond | $0.99 | one-time |
| Hommel | $2.99 | one-time |


### Chemdata

[App page](https://appshunter.io/ios/app/chemdata/id849758854)

Access a comprehensive chemical hazard database offline for incident management. Provides detailed information on over 62,000 chemicals, including safety, transport, and emergency response guidance. Offers multilingual support and regular updates.

**Highlights:** Offline chemical database access, Hazardous chemical identification, Incident command support, Transport classification, Personal Protective Equipment (PPE) guidance, Multilingual support (EN, NL, FR, DE, ES)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is UN Number free?

UN Number is free to download, with in-app purchases available.

### Is Chemdata free?

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

### Do UN Number or Chemdata have ads?

Neither UN Number nor Chemdata shows ads.

### Which is updated more often, UN Number or Chemdata?

UN Number ships an update every 3 months, and Chemdata every 19 months. Most recently, UN Number was updated on October 15, 2026 and Chemdata on October 4, 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.*