# Johne's Risk Assessor vs USDA PPRL

The clearest difference is price: USDA PPRL at Free against Johne's Risk Assessor's $4.99. USDA PPRL also leads on update cadence (every 2 months vs every 9 months) and device support (3 vs 1). Johne's Risk Assessor's advantage is iOS requirement (12.1 vs 15.0). On ads and in-app purchases there is nothing between them.

USDA PPRL is free to download; Johne's Risk Assessor costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Johne's Risk Assessor ships an update every 9 months, USDA PPRL every 2 months. The most recent releases landed on September 28, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Johne's Risk Assessor | USDA PPRL |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[4.8 (4 ratings)](https://appshunter.io/ios/app/usda-pprl/id6444455958/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 10 MB | 42 MB |
| Requires iOS | **12.1** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [University of Wisconsin - Madison School of Veterinary Medicine](https://appshunter.io/developer/871872159) | [Utah State University](https://appshunter.io/developer/408732147) |

## What reviewers say

### Johne's Risk Assessor

[App page](https://appshunter.io/ios/app/johnes-risk-assessor/id938353605)

**Features:** macOS Compatibility

**In-app purchases:** none


### USDA PPRL

[App page](https://appshunter.io/ios/app/usda-pprl/id6444455958)

This app helps livestock owners identify poisonous plants to prevent animal loss. It provides a searchable database of toxic flora and allows users to report livestock poisonings to the research lab.

**Highlights:** Identify poisonous plants, Searchable plant database, Prevent livestock loss, Report livestock poisonings, Awareness of toxic flora

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Johne's Risk Assessor free?

Johne's Risk Assessor costs $4.99, with no in-app purchases.

### Is USDA PPRL free?

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

### Do Johne's Risk Assessor or USDA PPRL have ads?

Neither Johne's Risk Assessor nor USDA PPRL shows ads.

### Which is updated more often, Johne's Risk Assessor or USDA PPRL?

Johne's Risk Assessor ships an update every 9 months, and USDA PPRL every 2 months. Most recently, Johne's Risk Assessor was updated on September 28, 2026 and USDA PPRL on October 18, 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.*