# FDR Calculator vs PDF Scanner

The clearest difference is ads: FDR Calculator at none against PDF Scanner's shown. FDR Calculator also leads on update cadence (every 4 months vs every 9 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. FDR Calculator sells 1 in-app purchase, starting at $1.99 per month and PDF Scanner sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

FDR Calculator ships an update every 4 months, PDF Scanner every 9 months. The most recent releases landed on November 1, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | FDR Calculator | PDF Scanner |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 months** | Every 9 months |
| Monetization | Free with in-app purchases | — |
| Size | 35 MB | 37 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alan Richert](https://appshunter.io/developer/527055673) | [Raheel Shareef](https://appshunter.io/developer/1707591149) |

## 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 (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weather Pro (Monthly) | $1.99 | per month |


### PDF Scanner

[App page](https://appshunter.io/ios/app/pdf-scanner-edit-scanner-app/id6466659435)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Ads free inapps | $3.99 | per 7 days |
| Monthly Ads free | $7.99 | per month |
| Lifetime Ads Free | $14.99 | one-time |


## Frequently asked questions

### Is FDR Calculator free?

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

### Is PDF Scanner free?

PDF Scanner is free to download, with in-app purchases available.

### Do FDR Calculator or PDF Scanner have ads?

PDF Scanner shows ads; FDR Calculator does not.

### Which is updated more often, FDR Calculator or PDF Scanner?

FDR Calculator ships an update every 4 months, and PDF Scanner every 9 months. Most recently, FDR Calculator was updated on November 1, 2026 and PDF Scanner on October 27, 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.*