# Second Brain Vault vs Stacks

The clearest difference is in-app purchases: Stacks at none against Second Brain Vault's 1. On price, ads, device support and iOS requirement there is nothing between them.

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

## The numbers

| Metric | Second Brain Vault | Stacks |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Size | 2 MB | 7 MB |
| Requires iOS | 26.0 | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Byoungho Kim](https://appshunter.io/developer/1888452963) | [Gerard Rodriguez](https://appshunter.io/developer/1882259709) |

## What reviewers say

### Second Brain Vault

[App page](https://appshunter.io/ios/app/second-brain-vault/id6782200821)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Second Brain Vault (Lifetime) | $17.99 | 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 Vault free?

Second Brain Vault 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 Vault or Stacks have ads?

Neither Second Brain Vault 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.*