# AskRail vs Decon Field Guide

The clearest difference is review sentiment: AskRail at 58% against Decon Field Guide's 0%. AskRail also leads on ads (none vs shown) and monetization model (free vs ad-supported). Decon Field Guide's advantage is rating (4.6 vs 4.1). 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.

Decon Field Guide holds the better App Store score, 4.6 against 4.1. Both are backed by a comparable volume of ratings — 37 and 8 respectively. Written reviews complicate that: 58% of AskRail's written reviews are positive against 0% of Decon Field Guide's, so the app with the better star average is not the one people write more warmly about.

AskRail ships an update every 4 months, Decon Field Guide every 2 months. The most recent releases landed on July 21, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | AskRail | Decon Field Guide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (37 ratings)](https://appshunter.io/ios/app/askrail/id1142325064/reviews) | **[4.6 (8 ratings)](https://appshunter.io/ios/app/decon-field-guide/id1388378944/reviews)** |
| Number of ratings | **37** | 8 |
| Positive reviews | **58.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | **Free** | Ad-supported |
| Size | 44 MB | 73 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [Association of American Railroads](https://appshunter.io/developer/1142325063) | [First Line Technology, LLC](https://appshunter.io/developer/1388378943) |

## What reviewers say

### 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


### Decon Field Guide

[App page](https://appshunter.io/ios/app/decon-field-guide/id1388378944)

This reference app provides quick and efficient decontamination methods for hundreds of threats. It features a classic Threat Index, pictorial instructions, and an in-app dwell timer to guide users through mission execution. Designed for approved users, it aims to make anyone an instant decontamination expert.

**Highlights:** Threat Index for decontamination methods, Pictorial instructions, In-app dwell timer, Covers hundreds of threats, Designed for approved users

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is AskRail free?

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

### Is Decon Field Guide free?

Decon Field Guide is free to download, with no in-app purchases.

### Which has better reviews, AskRail or Decon Field Guide?

Decon Field Guide is rated higher. AskRail averages 4.1 out of 5 from 37 ratings, while Decon Field Guide averages 4.6 from 8 ratings.

### Do AskRail or Decon Field Guide have ads?

Decon Field Guide shows ads; AskRail does not.

### Which is updated more often, AskRail or Decon Field Guide?

AskRail ships an update every 4 months, and Decon Field Guide every 2 months. Most recently, AskRail was updated on July 21, 2026 and Decon Field Guide on June 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.*