# Chemdata vs AskRail

The clearest difference is update cadence: AskRail at every 4 months against Chemdata's every 19 months. Chemdata's advantage is review sentiment (67% vs 58%) and iOS requirement (14.0 vs 16.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Chemdata ships an update every 19 months, AskRail every 4 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Chemdata | AskRail |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.1 (37 ratings)](https://appshunter.io/ios/app/askrail/id1142325064/reviews)** |
| Number of ratings | — | **37** |
| Positive reviews | **66.7% of reviews** | 58.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 4 months** |
| Monetization | Free | Free |
| Size | 49 MB | 44 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 12+ |
| Developer | [Ricardo-AEA ltd](https://appshunter.io/developer/691094634) | [Association of American Railroads](https://appshunter.io/developer/1142325063) |

## What reviewers say

### 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


### AskRail

[App page](https://appshunter.io/ios/app/askrail/id1142325064)

This app provides hazardous materials safety information for first responders dealing with rail incidents. It allows authorized personnel to query railcar contents and offers critical data for emergency response. Access to advanced features requires verification and railroad sponsorship.

**Highlights:** Hazardous materials safety information, Rail incident support, Query railcar contents, Emergency response data, First responder tool

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

**In-app purchases:** none


## Frequently asked questions

### Is Chemdata free?

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

### Is AskRail free?

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

### Do Chemdata or AskRail have ads?

Neither Chemdata nor AskRail shows ads.

### Which is updated more often, Chemdata or AskRail?

Chemdata ships an update every 19 months, and AskRail every 4 months. Most recently, Chemdata was updated on November 1, 2026 and AskRail on November 2, 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.*