# Abacus vs Flash

The clearest difference is price: Flash at Free against Abacus's $2.99. Flash also leads on update cadence (every 4 months vs every 9 months). Abacus's advantage is iOS requirement (15.6 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Flash is free to download; Abacus costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Abacus ships an update every 9 months, Flash every 4 months. The most recent releases landed on September 4, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Abacus | Flash |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Positive reviews | 15.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 4 months** |
| Monetization | Paid | — |
| Size | 12 MB | 16 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [俊 姜](https://appshunter.io/developer/974809005) | [yeeun seo](https://appshunter.io/developer/1634215603) |

## What reviewers say

### Abacus

[App page](https://appshunter.io/ios/app/abacus-dancing-fingers/id1153561673)

This educational app combines ancient calculation wisdom with modern technology. It features a beautiful interface with large beads, supports decimal points and negative numbers, and offers multilingual support for a fun and engaging learning experience.

**Highlights:** Beautiful interface with large beads, Support for decimal points and negative numbers, 21-column abacus, Multilingual support (19 languages), Interactive calculation examples

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

**In-app purchases:** none


### Flash

[App page](https://appshunter.io/ios/app/flash-mental-math/id1634215601)

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

**In-app purchases:** none


## Frequently asked questions

### Is Abacus free?

Abacus costs $2.99, with no in-app purchases.

### Is Flash free?

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

### Do Abacus or Flash have ads?

Neither Abacus nor Flash shows ads.

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

Abacus ships an update every 9 months, and Flash every 4 months. Most recently, Abacus was updated on September 4, 2026 and Flash on September 18, 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.*