# Fire Behaviour Calculator vs ERG for iOS

The clearest difference is review sentiment: ERG for iOS at 100% against Fire Behaviour Calculator's 0%. ERG for iOS also leads on rating (4.8 vs 2.0) and ratings volume (65 vs 1). Fire Behaviour Calculator's advantage is iOS requirement (9.0 vs 12.0). On price, update cadence, ads and in-app purchases there is nothing between them.

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

ERG for iOS holds the better App Store score, 4.8 against 2.0. That said, the two scores are not equally well evidenced: ERG for iOS has 65 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Fire Behaviour Calculator's written reviews are positive against 100% of ERG for iOS's.

Fire Behaviour Calculator ships an update every 9 months, ERG for iOS every 4 months. The most recent releases landed on October 3, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Fire Behaviour Calculator | ERG for iOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/fire-behaviour-calculator/id665759541/reviews) | **[4.8 (65 ratings)](https://appshunter.io/ios/app/erg-for-ios/id1597142669/reviews)** |
| Number of ratings | 1 | **65** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 4 months** |
| Monetization | Free | Free |
| Best chart rank | — | **#135** |
| Size | 4 MB | 27 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Scion](https://appshunter.io/developer/665759544) | [Pipeline and Hazardous Materials Safety Administration](https://appshunter.io/developer/954888820) |

## What reviewers say

### Fire Behaviour Calculator

[App page](https://appshunter.io/ios/app/fire-behaviour-calculator/id665759541)

This app provides calculations for fire behavior based on established fuel and fire models. It's a useful tool for understanding fire dynamics, developed with support from the NZ fire service commission.

**Highlights:** Fuel and fire behavior models, Scion Rural Fire Research models, NZ fire service commission support, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases:** none


### ERG for iOS

[App page](https://appshunter.io/ios/app/erg-for-ios/id1597142669)

**Currently charting:** #135 Top Free · Reference (US App Store)

This app provides first responders with quick access to critical information for hazardous materials transportation incidents. It features an indexed list of dangerous goods, including ID numbers, hazards, and safety precautions, aiding in effective response.

**Highlights:** Indexed list of dangerous goods, ID number lookup, General hazard information, Recommended safety precautions, Multi-language support (English, French, Spanish)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fire Behaviour Calculator free?

Fire Behaviour Calculator is free to download, with no in-app purchases.

### Is ERG for iOS free?

ERG for iOS is free to download, with no in-app purchases.

### Which has better reviews, Fire Behaviour Calculator or ERG for iOS?

ERG for iOS is rated higher. Fire Behaviour Calculator averages 2.0 out of 5 from 1 ratings, while ERG for iOS averages 4.8 from 65 ratings.

### Do Fire Behaviour Calculator or ERG for iOS have ads?

Neither Fire Behaviour Calculator nor ERG for iOS shows ads.

### Which is updated more often, Fire Behaviour Calculator or ERG for iOS?

Fire Behaviour Calculator ships an update every 9 months, and ERG for iOS every 4 months. Most recently, Fire Behaviour Calculator was updated on October 3, 2026 and ERG for iOS on October 21, 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.*