# Abacus Deluxe vs ONE SKY FLAGS

The clearest difference is price: ONE SKY FLAGS at Free against Abacus Deluxe's $0.99. Abacus Deluxe's advantage is chart position (#169 vs unranked) and iOS requirement (13.2 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

ONE SKY FLAGS is free to download; Abacus Deluxe costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Abacus Deluxe | ONE SKY FLAGS |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | — |
| Monetization | Paid | — |
| Best chart rank | **#169** | — |
| Size | 31 MB | 4 MB |
| Requires iOS | **13.2** | 15.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [Ivo Wessel](https://appshunter.io/developer/300756460) |

## What reviewers say

### Abacus Deluxe

[App page](https://appshunter.io/ios/app/abacus-deluxe/id911913335)

**Currently charting:** #169 Top Paid · Education (US App Store)

This app simulates a Chinese abacus, offering an interactive and fun way for students to learn counting, place value, and basic arithmetic. It helps develop mental math skills, potentially making users faster than with electronic calculators.

**Highlights:** Chinese abacus simulation, Interactive counting and arithmetic, Place value concept teaching, Mental math skill development, Fun and engaging learning tool

**Features:** Vision Pro support

**In-app purchases:** none


### ONE SKY FLAGS

[App page](https://appshunter.io/ios/app/one-sky-flags/id6804215179)

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

**In-app purchases:** none


## Frequently asked questions

### Is Abacus Deluxe free?

Abacus Deluxe costs $0.99, with no in-app purchases.

### Is ONE SKY FLAGS free?

ONE SKY FLAGS is free to download, with no in-app purchases.

### Do Abacus Deluxe or ONE SKY FLAGS have ads?

Neither Abacus Deluxe nor ONE SKY FLAGS shows ads.

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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.*