# Smart Adding Machine vs SereniBrain

The clearest difference is price: SereniBrain at Free against Smart Adding Machine's $3.99. SereniBrain also leads on iOS requirement (14.0 vs 17.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

SereniBrain is free to download; Smart Adding Machine costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Smart Adding Machine ships an update every 3 weeks, SereniBrain every 4 weeks. The most recent releases landed on September 25, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Smart Adding Machine | SereniBrain |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | — | **[4.7 (13 ratings)](https://appshunter.io/ios/app/serenibrain/id6479871875/reviews)** |
| Number of ratings | — | **13** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 weeks |
| Monetization | — | Free |
| Size | 0 MB | 341 MB |
| Requires iOS | 17.0 | **14.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Harry Detrick](https://appshunter.io/developer/1698895959) | [华南脑控(广东)智能科技有限公司](https://appshunter.io/developer/1728613747) |

## What reviewers say

### Smart Adding Machine

[App page](https://appshunter.io/ios/app/smart-adding-machine/id6452400755)

**In-app purchases:** none


### SereniBrain

[App page](https://appshunter.io/ios/app/serenibrain/id6479871875)

This tool uses brain-computer interface technology to guide users through meditation scenarios. It helps individuals learn meditation techniques to achieve relaxation for both body and mind. The app provides assessments, real-time feedback, and detailed analysis reports.

**Highlights:** Meditation State Assessment, Real-time Neural Feedback, Meditation Analysis Reports, Premium Practice Content

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Smart Adding Machine free?

Smart Adding Machine costs $3.99, with no in-app purchases.

### Is SereniBrain free?

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

### Do Smart Adding Machine or SereniBrain have ads?

Neither Smart Adding Machine nor SereniBrain shows ads.

### Which is updated more often, Smart Adding Machine or SereniBrain?

Smart Adding Machine ships an update every 3 weeks, and SereniBrain every 4 weeks. Most recently, Smart Adding Machine was updated on September 25, 2026 and SereniBrain on October 6, 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.*