# Mental Math vs (Open Source) Mental Math

The clearest difference is rating: (Open Source) Mental Math at 3.0 against Mental Math's 1.0. (Open Source) Mental Math also leads on in-app purchases (none vs 2). Mental Math's advantage is update cadence (fortnightly vs every 2 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Mental Math sells 2 one-off in-app purchases. (Open Source) Mental Math asks for nothing beyond the download.

(Open Source) Mental Math holds the better App Store score, 3.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

Mental Math ships an update fortnightly, (Open Source) Mental Math every 2 months. The most recent releases landed on September 26, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Mental Math | (Open Source) Mental Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/mental-math-kalc/id6764098294/reviews) | **[3.0 (2 ratings)](https://appshunter.io/ios/app/open-source-mental-math/id6788418444/reviews)** |
| Number of ratings | 1 | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 17 MB | 40 MB |
| Requires iOS | 17.6 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [LMT Digital Creations](https://appshunter.io/developer/640455461) | [AHMET EMRE DEDELER](https://appshunter.io/developer/1870913629) |

## What reviewers say

### Mental Math

[App page](https://appshunter.io/ios/app/mental-math-kalc/id6764098294)

Sharpen your mental math skills with daily practice. This app uses spaced repetition to help you master concepts like fractions, percentages, and algebra. It offers two modes for flexible learning and provides real-life examples of how math is used every day.

**Highlights:** Spaced repetition system (SRS), Covers multiplication, division, fractions, percentages, algebra, Zen and Chrono practice modes, Visible progress tracking, Real-life math examples, Home screen widgets, Customizable reminders

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plan Annuel | $17.99 | one-time |
| Accès à vie | $29.99 | one-time |


### (Open Source) Mental Math

[App page](https://appshunter.io/ios/app/open-source-mental-math/id6788418444)

This application offers a free, open-source platform for practicing mental arithmetic. It features timed tests, custom drills, and a comprehensive library of mental math tricks. All content is available offline without ads or paywalls.

**Highlights:** Timed arithmetic tests, Customizable drills, Mental math tricks library, Offline progress tracking, Multiple operation types, Fast session interface

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

**In-app purchases:** none


## Frequently asked questions

### Is Mental Math free?

Mental Math is free to download, with in-app purchases available.

### Is (Open Source) Mental Math free?

(Open Source) Mental Math is free to download, with no in-app purchases.

### Which has better reviews, Mental Math or (Open Source) Mental Math?

(Open Source) Mental Math is rated higher. Mental Math averages 1.0 out of 5 from 1 ratings, while (Open Source) Mental Math averages 3.0 from 2 ratings.

### Do Mental Math or (Open Source) Mental Math have ads?

Neither Mental Math nor (Open Source) Mental Math shows ads.

### Which is updated more often, Mental Math or (Open Source) Mental Math?

Mental Math ships an update fortnightly, and (Open Source) Mental Math every 2 months. Most recently, Mental Math was updated on September 26, 2026 and (Open Source) Mental Math on September 19, 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.*