# Justo Sierra vs Mental Arithmetic Math

The clearest difference is ads: Justo Sierra at none against Mental Arithmetic Math's shown. Justo Sierra also leads on update cadence (fortnightly vs every 2 months) and monetization model (free vs ad-supported). Mental Arithmetic Math's advantage is review sentiment (90% vs 64%). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Justo Sierra ships an update fortnightly, Mental Arithmetic Math every 2 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Justo Sierra | Mental Arithmetic Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.4 (97 ratings)](https://appshunter.io/ios/app/mental-arithmetic-math/id1580847431/reviews)** |
| Number of ratings | — | **97** |
| Positive reviews | 63.6% of reviews | **90.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | **Free** | Ad-supported |
| Size | 55 MB | 105 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Centro Cultural Universitario Justo Sierra, A.C.](https://appshunter.io/developer/1536602690) | [Satoshi Konno](https://appshunter.io/developer/1565729374) |

## What reviewers say

### Justo Sierra

[App page](https://appshunter.io/ios/app/justo-sierra/id1536602688)

This app provides students with school services, including grade checking and digital identification. It also sends notifications for important school communications like attendance reports and medical visits.

**Highlights:** View grades, Access digital ID, Receive school notifications, Track attendance reports, Get medical visit alerts

**Features:** macOS Compatibility

**In-app purchases:** none


### Mental Arithmetic Math

[App page](https://appshunter.io/ios/app/mental-arithmetic-math/id1580847431)

Engage in fun arithmetic challenges suitable for all ages. Improve your math skills and concentration with adjustable difficulty levels. Play solo or with friends, even offline, for a quick and enjoyable brain workout.

**Highlights:** Arithmetic challenges, Adjustable difficulty, Suitable for all ages, Play with friends, Offline play, Improves concentration

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Justo Sierra free?

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

### Is Mental Arithmetic Math free?

Mental Arithmetic Math is free to download, with no in-app purchases.

### Do Justo Sierra or Mental Arithmetic Math have ads?

Mental Arithmetic Math shows ads; Justo Sierra does not.

### Which is updated more often, Justo Sierra or Mental Arithmetic Math?

Justo Sierra ships an update fortnightly, and Mental Arithmetic Math every 2 months. Most recently, Justo Sierra was updated on October 24, 2026 and Mental Arithmetic Math on October 24, 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.*