# SDM 2020 vs Mental Math

The clearest difference is in-app purchases: SDM 2020 at none against Mental Math's 2. SDM 2020 also leads on iOS requirement (10.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. Mental Math sells 2 one-off in-app purchases. SDM 2020 asks for nothing beyond the download.

## The numbers

| Metric | SDM 2020 | Mental Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/mental-math-kalc/id6764098294/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Fortnightly |
| Monetization | — | Free with in-app purchases |
| Size | 24 MB | 17 MB |
| Requires iOS | **10.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Christophe Auclair](https://appshunter.io/developer/1333526155) | [LMT Digital Creations](https://appshunter.io/developer/640455461) |

## What reviewers say

### SDM 2020

[App page](https://appshunter.io/ios/app/sdm-2020/id1498469308)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is SDM 2020 free?

SDM 2020 is free to download, with no in-app purchases.

### Is Mental Math free?

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

### Do SDM 2020 or Mental Math have ads?

Neither SDM 2020 nor Mental Math 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.*