# Simple Zen vs SecondBrain AI Assistant

The clearest difference is update cadence: SecondBrain AI Assistant at daily against Simple Zen's every 2 weeks. SecondBrain AI Assistant also leads on device support (3 vs 1) and iOS requirement (15.0 vs 18.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Simple Zen sells 2 one-off in-app purchases and SecondBrain AI Assistant sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Simple Zen ships an update every 2 weeks, SecondBrain AI Assistant daily. The most recent releases landed on October 31, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Simple Zen | SecondBrain AI Assistant |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Daily** |
| Size | 110 MB | 24 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [立派 汪](https://appshunter.io/developer/1604350706) | [BUILD TO CONNECT LTD](https://appshunter.io/developer/6778076361) |

## What reviewers say

### Simple Zen

[App page](https://appshunter.io/ios/app/simple-zen-dumb-phone/id6760552860)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Simple Zen Premium_ | $3.99 | one-time |
| Simple Zen Premium | $3.99 | one-time |


### 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 |


## Frequently asked questions

### Is Simple Zen free?

Simple Zen is free to download, with in-app purchases available.

### Is SecondBrain AI Assistant free?

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

### Do Simple Zen or SecondBrain AI Assistant have ads?

Neither Simple Zen nor SecondBrain AI Assistant shows ads.

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

Simple Zen ships an update every 2 weeks, and SecondBrain AI Assistant daily. Most recently, Simple Zen was updated on October 31, 2026 and SecondBrain AI Assistant 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.*