# BrainTrainingCalculator vs Onikeisan

The clearest difference is ads: Onikeisan at none against BrainTrainingCalculator's shown. Onikeisan also leads on iOS requirement (12.0 vs 15.5). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

BrainTrainingCalculator ships an update weekly, Onikeisan every 9 days. The most recent releases landed on November 8, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | BrainTrainingCalculator | Onikeisan |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 9 days |
| Size | 4 MB | 37 MB |
| Requires iOS | 15.5 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ryo muranaka](https://appshunter.io/developer/1606480078) | [iori kojima](https://appshunter.io/developer/1493044568) |

## What reviewers say

### BrainTrainingCalculator

[App page](https://appshunter.io/ios/app/braintrainingcalculatorsimple/id1644516996)

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

**In-app purchases:** none


### Onikeisan

[App page](https://appshunter.io/ios/app/onikeisan-n-back/id6745093026)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is BrainTrainingCalculator free?

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

### Is Onikeisan free?

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

### Do BrainTrainingCalculator or Onikeisan have ads?

BrainTrainingCalculator shows ads; Onikeisan does not.

### Which is updated more often, BrainTrainingCalculator or Onikeisan?

BrainTrainingCalculator ships an update weekly, and Onikeisan every 9 days. Most recently, BrainTrainingCalculator was updated on November 8, 2026 and Onikeisan on October 30, 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.*