# FDR Calculator vs FWAS

The clearest difference is in-app purchases: FWAS at none against FDR Calculator's 2. FWAS also leads on review sentiment (25% vs 0%) and iOS requirement (10.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. FDR Calculator sells 2 in-app purchases, starting at $1.99 per month. FWAS asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | FDR Calculator | FWAS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.3 (10 ratings)](https://appshunter.io/ios/app/fwasfire-weather-alert-system/id6445856411/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | 0.0% of reviews | **25.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 35 MB | 200 MB |
| Requires iOS | 15.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alan Richert](https://appshunter.io/developer/527055673) | [US Forest Service](https://appshunter.io/developer/949583790) |

## What reviewers say

### FDR Calculator

[App page](https://appshunter.io/ios/app/fdr-calculator/id527055670)

Instantly calculate fire danger ratings with professional-grade algorithms. Offers real-time weather data integration, visual danger level displays, and detailed action recommendations for informed fire prevention and management.

**Highlights:** Instant Fire Danger Index calculations, Real-time weather data integration, Visual color-coded danger levels, Detailed action recommendations, Manual calculator for offline use, Automatic location detection

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weather Pro (Monthly) | $1.99 | per month |
| Enable Local Weather | Free | one-time |


### FWAS

[App page](https://appshunter.io/ios/app/fwasfire-weather-alert-system/id6445856411)

This app provides critical weather information and custom alerts for firefighters to anticipate dangerous fire behavior. It offers map-based access to fire-specific weather data, including RAWS, NWS forecasts, and radar, helping to prevent entrapments.

**Highlights:** Custom weather alerts, RAWS/ASOS station data, Fire-specific weather forecasts, Satellite hotspot mapping, Incident location and fire perimeters, NWS watches, warnings, and advisories, NEXRAD radar data

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is FDR Calculator free?

FDR Calculator is free to download, with in-app purchases available.

### Is FWAS free?

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

### Do FDR Calculator or FWAS have ads?

Neither FDR Calculator nor FWAS shows ads.

### Which is updated more often, FDR Calculator or FWAS?

FDR Calculator ships an update every 4 months, and FWAS every 4 months. Most recently, FDR Calculator was updated on October 23, 2026 and FWAS 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.*