# SecondBrain AI Assistant vs Walnut

The clearest difference is in-app purchases: Walnut at none against SecondBrain AI Assistant's 2. SecondBrain AI Assistant's advantage is update cadence (daily vs every 3 days) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. SecondBrain AI Assistant sells 2 in-app purchases, starting at $9.99 per month. Walnut asks for nothing beyond the download.

SecondBrain AI Assistant ships an update daily, Walnut every 3 days. The most recent releases landed on October 17, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | SecondBrain AI Assistant | Walnut |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Every 3 days |
| Size | 23 MB | 160 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [BUILD TO CONNECT LTD](https://appshunter.io/developer/6778076361) | [Rajesh Goel](https://appshunter.io/developer/6791231262) |

## What reviewers say

### SecondBrain AI Assistant

[App page](https://appshunter.io/ios/app/secondbrain-ai-assistant/id6778076359)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Second Brain Pro Monthly | $9.99 | per month |
| Second Brain Pro Annual | $69.99 | per year |


### Walnut

[App page](https://appshunter.io/ios/app/walnut-your-second-memory/id6791230870)

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

**In-app purchases:** none


## Frequently asked questions

### Is SecondBrain AI Assistant free?

SecondBrain AI Assistant is free to download, with in-app purchases available.

### Is Walnut free?

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

### Do SecondBrain AI Assistant or Walnut have ads?

Neither SecondBrain AI Assistant nor Walnut shows ads.

### Which is updated more often, SecondBrain AI Assistant or Walnut?

SecondBrain AI Assistant ships an update daily, and Walnut every 3 days. Most recently, SecondBrain AI Assistant was updated on October 17, 2026 and Walnut on October 24, 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.*