# Piggy Knowledge vs Structured Outliner

The clearest difference is ads: Piggy Knowledge at none against Structured Outliner's shown. Piggy Knowledge also leads on iOS requirement (11.0 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Piggy Knowledge sells 1 one-off in-app purchase and Structured Outliner sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Piggy Knowledge | Structured Outliner |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Every 9 days |
| Size | 50 MB | 6 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Rolling Pig Studio](https://appshunter.io/developer/1039625108) | [Felipe Carraro](https://appshunter.io/developer/1887606432) |

## What reviewers say

### Piggy Knowledge

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

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

**In-app purchases (1)**

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


### Structured Outliner

[App page](https://appshunter.io/ios/app/structured-outliner/id6761066639)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $7.99 | one-time |


## Frequently asked questions

### Is Piggy Knowledge free?

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

### Is Structured Outliner free?

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

### Do Piggy Knowledge or Structured Outliner have ads?

Structured Outliner shows ads; Piggy Knowledge does not.

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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.*