# AnzanDojo vs Flash mental calculation

The clearest difference is in-app purchases: AnzanDojo at none against Flash mental calculation's 1. AnzanDojo also leads on ads (none vs shown) and update cadence (every 3 weeks vs every 5 months). On price and device support there is nothing between them.

Both are free to download. Flash mental calculation sells 1 one-off in-app purchase. AnzanDojo asks for nothing beyond the download.

AnzanDojo ships an update every 3 weeks, Flash mental calculation every 5 months. The most recent releases landed on December 5, 2025 and August 19, 2026 respectively.

## The numbers

| Metric | AnzanDojo | Flash mental calculation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/flash-mental-calculation/id1224937523/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 5 months |
| Monetization | — | Free with in-app purchases |
| Size | 4 MB | 11 MB |
| Requires iOS | **9.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ZOOMO Inc.](https://appshunter.io/developer/490112424) | [kenji kiuchi](https://appshunter.io/developer/553473005) |

## What reviewers say

### AnzanDojo

[App page](https://appshunter.io/ios/app/anzandojo/id490112421)

**Features:** macOS Compatibility

**In-app purchases:** none


### Flash mental calculation

[App page](https://appshunter.io/ios/app/flash-mental-calculation/id1224937523)

Practice mental arithmetic with this educational app. Review your calculation process, and easily re-challenge mistaken problems from your past logs. Upgrade to save more calculation history.

**Highlights:** Practice flash mental arithmetic, Review calculation process, Rechallenge mistaken problems, Save past calculation logs, Log history saved after purchase

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove AD & All function Release. | $9.99 | one-time |


## Frequently asked questions

### Is AnzanDojo free?

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

### Is Flash mental calculation free?

Flash mental calculation is free to download, with in-app purchases available.

### Do AnzanDojo or Flash mental calculation have ads?

Flash mental calculation shows ads; AnzanDojo does not.

### Which is updated more often, AnzanDojo or Flash mental calculation?

AnzanDojo ships an update every 3 weeks, and Flash mental calculation every 5 months. Most recently, AnzanDojo was updated on December 5, 2025 and Flash mental calculation on August 19, 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.*