# Fire Behaviour Calculator vs IRPG App (2025)

The clearest difference is review sentiment: IRPG App (2025) at 57% against Fire Behaviour Calculator's 0%. IRPG App (2025) also leads on rating (4.3 vs 2.0) and update cadence (every 5 weeks vs every 9 months). Fire Behaviour Calculator's advantage is in-app purchases (none vs 1) and iOS requirement (9.0 vs 14.0). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. IRPG App (2025) sells 1 one-off in-app purchase. Fire Behaviour Calculator asks for nothing beyond the download.

IRPG App (2025) holds the better App Store score, 4.3 against 2.0. That said, the two scores are not equally well evidenced: IRPG App (2025) has 32 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 57% of IRPG App (2025)'s.

Fire Behaviour Calculator ships an update every 9 months, IRPG App (2025) every 5 weeks. The most recent releases landed on October 3, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Fire Behaviour Calculator | IRPG App (2025) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/fire-behaviour-calculator/id665759541/reviews) | **[4.3 (32 ratings)](https://appshunter.io/ios/app/irpg-app-2025/id1562135017/reviews)** |
| Number of ratings | 1 | **32** |
| Positive reviews | 0.0% of reviews | **57.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 4 MB | 44 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Scion](https://appshunter.io/developer/665759544) | [Twisted Kelp, LLC](https://appshunter.io/developer/1562135019) |

## 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


### IRPG App (2025)

[App page](https://appshunter.io/ios/app/irpg-app-2025/id1562135017)

This digital guide provides offline access to critical incident response information for wildland firefighters. It features full-text search, bookmarking, note-taking, and integrated checklists for radio communication and weather reporting. Optimized for speed and safety on the fireline.

**Highlights:** Full-text search, Bookmark chapters, In-app note-taking, Selectable radio checklists, GPS-enabled weather reporting, Offline capability

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is Fire Behaviour Calculator free?

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

### Is IRPG App (2025) free?

IRPG App (2025) is free to download, with in-app purchases available.

### Which has better reviews, Fire Behaviour Calculator or IRPG App (2025)?

IRPG App (2025) is rated higher. Fire Behaviour Calculator averages 2.0 out of 5 from 1 ratings, while IRPG App (2025) averages 4.3 from 32 ratings.

### Do Fire Behaviour Calculator or IRPG App (2025) have ads?

Neither Fire Behaviour Calculator nor IRPG App (2025) shows ads.

### Which is updated more often, Fire Behaviour Calculator or IRPG App (2025)?

Fire Behaviour Calculator ships an update every 9 months, and IRPG App (2025) every 5 weeks. Most recently, Fire Behaviour Calculator was updated on October 3, 2026 and IRPG App (2025) on October 24, 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.*