# Donna vs Second Brain

The clearest difference is in-app purchases: Donna at none against Second Brain's 2. Donna also leads on iOS requirement (15.1 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Second Brain sells 2 in-app purchases, starting at $7.99 per 7 days. Donna asks for nothing beyond the download.

Donna ships an update every 8 days, Second Brain every 5 days. The most recent releases landed on November 5, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Donna | Second Brain |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 5 days** |
| Size | 40 MB | 55 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Kishan Sagathiya](https://appshunter.io/developer/1824853698) | [Terra Innovations](https://appshunter.io/developer/1789492814) |

## What reviewers say

### Donna

[App page](https://appshunter.io/ios/app/donna-best-ai-second-brain/id6776987368)

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

**In-app purchases:** none


### Second Brain

[App page](https://appshunter.io/ios/app/second-brain-ai-assistant/id6792532203)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $7.99 | per 7 days |
| Monthly | $29.99 | per month |


## Frequently asked questions

### Is Donna free?

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

### Is Second Brain free?

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

### Do Donna or Second Brain have ads?

Neither Donna nor Second Brain shows ads.

### Which is updated more often, Donna or Second Brain?

Donna ships an update every 8 days, and Second Brain every 5 days. Most recently, Donna was updated on November 5, 2026 and Second Brain on November 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.*