# Decon Field Guide vs EPA RSL/RML

The clearest difference is review sentiment: EPA RSL/RML at 50% against Decon Field Guide's 0%. EPA RSL/RML also leads on monetization model (free vs ad-supported) and iOS requirement (11.0 vs 15.1). Decon Field Guide's advantage is rating (4.6 vs 4.0). On price, ratings volume, update cadence and ads 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 4.0. Both are backed by a comparable volume of ratings — 8 and 3 respectively. Written reviews complicate that: 0% of Decon Field Guide's written reviews are positive against 50% of EPA RSL/RML's, so the app with the better star average is not the one people write more warmly about.

Decon Field Guide ships an update every 2 months, EPA RSL/RML every 5 months. The most recent releases landed on October 25, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Decon Field Guide | EPA RSL/RML |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (8 ratings)](https://appshunter.io/ios/app/decon-field-guide/id1388378944/reviews)** | [4.0 (3 ratings)](https://appshunter.io/ios/app/epa-rslrml/id1461247823/reviews) |
| Number of ratings | **8** | 3 |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | Ad-supported | **Free** |
| Size | 74 MB | 23 MB |
| Requires iOS | 15.1 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [First Line Technology](https://appshunter.io/developer/1388378943) | [United States Environmental Protection Agency (USEPA)](https://appshunter.io/developer/466052690) |

## What reviewers say

### 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


### EPA RSL/RML

[App page](https://appshunter.io/ios/app/epa-rslrml/id1461247823)

This app provides chemical-specific concentrations for contaminants in air, water, and soil. These levels help determine if further investigation or cleanup is needed. It is updated twice a year.

**Highlights:** Regional Screening Levels (RSLs), Removal Management Levels (RMLs), Chemical-specific concentrations, Risk-based levels, Updated twice a year

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Decon Field Guide free?

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

### Is EPA RSL/RML free?

EPA RSL/RML is free to download, with no in-app purchases.

### Which has better reviews, Decon Field Guide or EPA RSL/RML?

Decon Field Guide is rated higher. Decon Field Guide averages 4.6 out of 5 from 8 ratings, while EPA RSL/RML averages 4.0 from 3 ratings.

### Do Decon Field Guide or EPA RSL/RML have ads?

Neither Decon Field Guide nor EPA RSL/RML shows ads.

### Which is updated more often, Decon Field Guide or EPA RSL/RML?

Decon Field Guide ships an update every 2 months, and EPA RSL/RML every 5 months. Most recently, Decon Field Guide was updated on October 25, 2026 and EPA RSL/RML on October 13, 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.*