# Second Brain vs Outliner by codediary

The clearest difference is in-app purchases: Outliner by codediary at none against Second Brain's 1. Outliner by codediary also leads on update cadence (every 5 days vs every 3 months). Second Brain's advantage is iOS requirement (15.0 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. Second Brain sells 1 one-off in-app purchase. Outliner by codediary asks for nothing beyond the download.

Second Brain ships an update every 3 months, Outliner by codediary every 5 days. The most recent releases landed on October 1, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Second Brain | Outliner by codediary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Size | 25 MB | 7 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Selahattin Bozat](https://appshunter.io/developer/1895293163) | [jeong kyu lee](https://appshunter.io/developer/366597249) |

## What reviewers say

### 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 |


### Outliner by codediary

[App page](https://appshunter.io/ios/app/outliner-by-codediary/id6786943296)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Second Brain free?

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

### Is Outliner by codediary free?

Outliner by codediary is free to download, with no in-app purchases.

### Do Second Brain or Outliner by codediary have ads?

Neither Second Brain nor Outliner by codediary shows ads.

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

Second Brain ships an update every 3 months, and Outliner by codediary every 5 days. Most recently, Second Brain was updated on October 1, 2026 and Outliner by codediary on October 10, 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.*