# USFS Risk Calculator vs DisabilityLog

The clearest difference is in-app purchases: USFS Risk Calculator at none against DisabilityLog's 2. USFS Risk Calculator also leads on iOS requirement (13.0 vs 17.0). DisabilityLog's advantage is update cadence (monthly vs every 32 months). On price, ads and device support there is nothing between them.

Both are free to download. DisabilityLog sells 2 in-app purchases, starting at $3.99 per month. USFS Risk Calculator asks for nothing beyond the download.

USFS Risk Calculator ships an update every 32 months, DisabilityLog monthly. The most recent releases landed on September 10, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | USFS Risk Calculator | DisabilityLog |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 32 months | **Monthly** |
| Size | 42 MB | 4 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [US Forest Service](https://appshunter.io/developer/949583790) | [慧慧 高](https://appshunter.io/developer/1887721875) |

## What reviewers say

### USFS Risk Calculator

[App page](https://appshunter.io/ios/app/usfs-risk-calculator/id1496807580)

**Features:** macOS Compatibility

**In-app purchases:** none


### DisabilityLog

[App page](https://appshunter.io/ios/app/disabilitylog/id6764089395)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $3.99 | per month |
| Pro Annual | $29.99 | per year |


## Frequently asked questions

### Is USFS Risk Calculator free?

USFS Risk Calculator is free to download, with no in-app purchases.

### Is DisabilityLog free?

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

### Do USFS Risk Calculator or DisabilityLog have ads?

Neither USFS Risk Calculator nor DisabilityLog shows ads.

### Which is updated more often, USFS Risk Calculator or DisabilityLog?

USFS Risk Calculator ships an update every 32 months, and DisabilityLog monthly. Most recently, USFS Risk Calculator was updated on September 10, 2026 and DisabilityLog on September 14, 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.*