# Second Brain vs Stacks

The clearest difference is in-app purchases: Stacks at none against Second Brain's 1. Second Brain's advantage is iOS requirement (15.0 vs 26.0). 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. Stacks asks for nothing beyond the download.

## The numbers

| Metric | Second Brain | Stacks |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Size | 25 MB | 7 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Selahattin Bozat](https://appshunter.io/developer/1895293163) | [Gerard Rodriguez](https://appshunter.io/developer/1882259709) |

## 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 |


### Stacks

[App page](https://appshunter.io/ios/app/stacks-save-anything/id6799384234)

**Features:** macOS Compatibility, 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 Stacks free?

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

### Do Second Brain or Stacks have ads?

Neither Second Brain nor Stacks 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.*