# Biorisk External vs Piggy Knowledge

The clearest difference is in-app purchases: Biorisk External at none against Piggy Knowledge's 1. Piggy Knowledge's advantage is iOS requirement (11.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Piggy Knowledge sells 1 one-off in-app purchase. Biorisk External asks for nothing beyond the download.

## The numbers

| Metric | Biorisk External | Piggy Knowledge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | — |
| Size | 60 MB | 50 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [pigchamp](https://appshunter.io/developer/1518568682) | [Rolling Pig Studio](https://appshunter.io/developer/1039625108) |

## What reviewers say

### Biorisk External

[App page](https://appshunter.io/ios/app/biorisk-external/id1612622528)

**Features:** Vision Pro support

**In-app purchases:** none


### Piggy Knowledge

[App page](https://appshunter.io/ios/app/piggy-knowledge/id6466038846)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee | $0.99 | one-time |


## Frequently asked questions

### Is Biorisk External free?

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

### Is Piggy Knowledge free?

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

### Do Biorisk External or Piggy Knowledge have ads?

Neither Biorisk External nor Piggy Knowledge shows ads.

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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.*