# FlashAnzan vs Abacus

The clearest difference is in-app purchases: Abacus at none against FlashAnzan's 1. FlashAnzan's advantage is ads (none vs shown) and update cadence (every 3 days vs every 10 days). On price and device support there is nothing between them.

Both are free to download. FlashAnzan sells 1 one-off in-app purchase. Abacus asks for nothing beyond the download.

FlashAnzan ships an update every 3 days, Abacus every 10 days. The most recent releases landed on October 29, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | FlashAnzan | Abacus |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Every 10 days |
| Size | 8 MB | 19 MB |
| Requires iOS | **18.0** | 26 |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Haruhiko Kishi](https://appshunter.io/developer/942468714) | [Aleksandr Govorukhin](https://appshunter.io/developer/1729392672) |

## What reviewers say

### FlashAnzan

[App page](https://appshunter.io/ios/app/flashanzan-mental-math/id6799545041)

**Features:** Family Sharing, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Grades | $3.99 | one-time |


### Abacus

[App page](https://appshunter.io/ios/app/abacus-mental-arithmetic/id6819154039)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is FlashAnzan free?

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

### Is Abacus free?

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

### Do FlashAnzan or Abacus have ads?

Abacus shows ads; FlashAnzan does not.

### Which is updated more often, FlashAnzan or Abacus?

FlashAnzan ships an update every 3 days, and Abacus every 10 days. Most recently, FlashAnzan was updated on October 29, 2026 and Abacus on November 6, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*