# Brain Training Calculation Master vs Retro N

The clearest difference is in-app purchases: Brain Training Calculation Master at none against Retro N's 4. Brain Training Calculation Master also leads on update cadence (every 3 months vs every 8 months) and iOS requirement (7.0 vs 13.0). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Retro N sells 4 one-off in-app purchases. Brain Training Calculation Master asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Brain Training Calculation Master against 5.0 for Retro N. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Brain Training Calculation Master ships an update every 3 months, Retro N every 8 months. The most recent releases landed on October 17, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Brain Training Calculation Master | Retro N |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/brain-training-calculation-master/id702231884/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/retro-n-back-memory-rangers/id1160120514/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 months** | Every 8 months |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 16 MB | 74 MB |
| Requires iOS | **7.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Takahiro Iwatani](https://appshunter.io/developer/702231887) | [TELULU LLC](https://appshunter.io/developer/1160120513) |

## What reviewers say

### Brain Training Calculation Master

[App page](https://appshunter.io/ios/app/brain-training-calculation-master/id702231884)

Enhance your mathematical skills with engaging practice sessions. This app offers customizable drills for addition, subtraction, and multiplication, with options for digit count and question quantity. It also features unique numeral systems to further challenge your brain.

**Highlights:** Addition, subtraction, and multiplication practice, Selectable digit count (1-4 digits), Customizable question quantity (10, 30, 50, 100), Adjustable button arrangement, Multiple numeral systems (standard, Chinese, Japanese, English)

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

**In-app purchases:** none


### Retro N

[App page](https://appshunter.io/ios/app/retro-n-back-memory-rangers/id1160120514)

Engage in retro-style brain training that makes the N-back task enjoyable. Improve memory, focus, and emotional control through a superhero-themed game. Suitable for all ages, it offers a free, ad-supported experience with optional in-app purchases.

**Highlights:** Retro 8-bit N-back gameplay, Improves memory and focus, Superhero Ranger theme, Up to 3 players on one device, No login or personal data collection, Minimal ads, child-safe

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support for this app (100) | $0.49 | one-time |
| Remove Ads | $2.99 | one-time |
| Support for this app (500) | $2.99 | one-time |
| Support for this app (1000) | $5.99 | one-time |


## Frequently asked questions

### Is Brain Training Calculation Master free?

Brain Training Calculation Master is free to download, with no in-app purchases.

### Is Retro N free?

Retro N is free to download, with in-app purchases available.

### Which has better reviews, Brain Training Calculation Master or Retro N?

Brain Training Calculation Master and Retro N are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Brain Training Calculation Master or Retro N have ads?

Both Brain Training Calculation Master and Retro N show ads.

### Which is updated more often, Brain Training Calculation Master or Retro N?

Brain Training Calculation Master ships an update every 3 months, and Retro N every 8 months. Most recently, Brain Training Calculation Master was updated on October 17, 2026 and Retro N on September 29, 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.*