# Structured Outliner vs Second Brain

The clearest difference is ads: Second Brain at none against Structured Outliner's shown. Second Brain also leads on iOS requirement (15.0 vs 17.0). Structured Outliner's advantage is update cadence (every 9 days vs every 3 months). On price, in-app purchases and device support there is nothing between them.

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

Structured Outliner ships an update every 9 days, Second Brain every 3 months. The most recent releases landed on October 7, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Structured Outliner | Second Brain |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 9 days** | Every 3 months |
| Size | 6 MB | 25 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Felipe Carraro](https://appshunter.io/developer/1887606432) | [Selahattin Bozat](https://appshunter.io/developer/1895293163) |

## What reviewers say

### 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 |


### Second Brain

[App page](https://appshunter.io/ios/app/second-brain-notes-and-knowledge/id6775839727)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Second Brain Premium | $9.99 | one-time |


## Frequently asked questions

### Is Structured Outliner free?

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

### Is Second Brain free?

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

### Do Structured Outliner or Second Brain have ads?

Structured Outliner shows ads; Second Brain does not.

### Which is updated more often, Structured Outliner or Second Brain?

Structured Outliner ships an update every 9 days, and Second Brain every 3 months. Most recently, Structured Outliner was updated on October 7, 2026 and Second Brain on October 1, 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.*