# Combo the NUMBER vs MentalCalculation & Abacus Pro

The clearest difference is price: Combo the NUMBER at Free against MentalCalculation & Abacus Pro's $0.99. Combo the NUMBER also leads on ads (none vs shown) and update cadence (every 2 weeks vs monthly). On in-app purchases, device support and iOS requirement there is nothing between them.

Combo the NUMBER is free to download; MentalCalculation & Abacus Pro costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Combo the NUMBER ships an update every 2 weeks, MentalCalculation & Abacus Pro monthly. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Combo the NUMBER | MentalCalculation & Abacus Pro |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | — | Paid |
| Size | 45 MB | 144 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Choong-Ji Kim](https://appshunter.io/developer/665712494) | [Park Jisang](https://appshunter.io/developer/995438886) |

## What reviewers say

### Combo the NUMBER

[App page](https://appshunter.io/ios/app/combo-the-number/id6464404840)

**Features:** macOS Compatibility

**In-app purchases:** none


### MentalCalculation & Abacus Pro

[App page](https://appshunter.io/ios/app/mentalcalculation-and-abacus-pro/id6474296462)

Engage in a fun and challenging mental calculation and abacus game. Practice with diverse questions and learn the abacus with an easy tutorial. This pro version offers an enhanced experience without frequent forced ads.

**Highlights:** Mental calculation practice, Abacus learning tutorial, Variety of practice questions, Pro version benefits, No forced ads

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

**In-app purchases:** none


## Frequently asked questions

### Is Combo the NUMBER free?

Combo the NUMBER is free to download, with no in-app purchases.

### Is MentalCalculation & Abacus Pro free?

MentalCalculation & Abacus Pro costs $0.99, with no in-app purchases.

### Do Combo the NUMBER or MentalCalculation & Abacus Pro have ads?

MentalCalculation & Abacus Pro shows ads; Combo the NUMBER does not.

### Which is updated more often, Combo the NUMBER or MentalCalculation & Abacus Pro?

Combo the NUMBER ships an update every 2 weeks, and MentalCalculation & Abacus Pro monthly. Most recently, Combo the NUMBER was updated on October 27, 2026 and MentalCalculation & Abacus Pro on October 30, 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.*