# Rounding Unlocked vs (Open Source) Mental Math

The clearest difference is in-app purchases: (Open Source) Mental Math at none against Rounding Unlocked's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Rounding Unlocked sells 1 one-off in-app purchase. (Open Source) Mental Math asks for nothing beyond the download.

Rounding Unlocked ships an update every 3 weeks, (Open Source) Mental Math every 5 weeks. Both last shipped on October 31, 2026.

## The numbers

| Metric | Rounding Unlocked | (Open Source) Mental Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/open-source-mental-math/id6788418444/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | — | Free |
| Size | 50 MB | 41 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [One On One Tutoring Service](https://appshunter.io/developer/1886746583) | [AHMET EMRE DEDELER](https://appshunter.io/developer/1870913629) |

## What reviewers say

### Rounding Unlocked

[App page](https://appshunter.io/ios/app/rounding-unlocked/id6780656864)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Worlds | $2.99 | 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 Rounding Unlocked free?

Rounding Unlocked 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.

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

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

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

Rounding Unlocked ships an update every 3 weeks, and (Open Source) Mental Math every 5 weeks. Most recently, Rounding Unlocked was updated on October 31, 2026 and (Open Source) Mental Math on October 31, 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.*