# aira vs Second Brain Vault

The clearest difference is in-app purchases: aira at none against Second Brain Vault's 1. aira also leads on iOS requirement (17.0 vs 26.0). On price, ads and device support there is nothing between them.

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

## The numbers

| Metric | aira | Second Brain Vault |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Size | 56 MB | 2 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [John Lim](https://appshunter.io/developer/1886852946) | [Byoungho Kim](https://appshunter.io/developer/1888452963) |

## What reviewers say

### aira

[App page](https://appshunter.io/ios/app/aira-private-second-brain/id6760924946)

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is aira free?

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

### Is Second Brain Vault free?

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

### Do aira or Second Brain Vault have ads?

Neither aira nor Second Brain Vault 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.*