# Flash Anzan Brain Training vs Abacus Slash

The clearest difference is in-app purchases: Flash Anzan Brain Training at none against Abacus Slash's 1. Flash Anzan Brain Training also leads on iOS requirement (13.0 vs 17.4). Abacus Slash's advantage is update cadence (every 2 days vs every 22 months). On price, ads and device support there is nothing between them.

Both are free to download. Abacus Slash sells 1 one-off in-app purchase. Flash Anzan Brain Training asks for nothing beyond the download.

Flash Anzan Brain Training ships an update every 22 months, Abacus Slash every 2 days. The most recent releases landed on October 19, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Flash Anzan Brain Training | Abacus Slash |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/abacus-slash/id6770142318/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 22 months | **Every 2 days** |
| Monetization | — | Free with in-app purchases |
| Size | 75 MB | 13 MB |
| Requires iOS | **13.0** | 17.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [TSUBASA MIZUNO](https://appshunter.io/developer/888522562) | [POPPO STUDIO](https://appshunter.io/developer/304529440) |

## What reviewers say

### Flash Anzan Brain Training

[App page](https://appshunter.io/ios/app/flash-anzan-brain-training/id6476837041)

**Features:** macOS Compatibility

**In-app purchases:** none


### Abacus Slash

[App page](https://appshunter.io/ios/app/abacus-slash/id6770142318)

A fast-paced game where you quickly input numbers on a virtual abacus to match on-screen prompts before your health depletes. Progress through 30 stages and 10 chapters, improving your mental math speed and abacus skills.

**Highlights:** Lightning-fast abacus calculation, 30 stages with increasing difficulty, Chapter-based story progression, Best time and star ratings, Multiple player profiles, Practice stages for basics

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Stages & Remove Ads | $3.99 | one-time |


## Frequently asked questions

### Is Flash Anzan Brain Training free?

Flash Anzan Brain Training is free to download, with no in-app purchases.

### Is Abacus Slash free?

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

### Do Flash Anzan Brain Training or Abacus Slash have ads?

Both Flash Anzan Brain Training and Abacus Slash show ads.

### Which is updated more often, Flash Anzan Brain Training or Abacus Slash?

Flash Anzan Brain Training ships an update every 22 months, and Abacus Slash every 2 days. Most recently, Flash Anzan Brain Training was updated on October 19, 2026 and Abacus Slash on October 14, 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.*