# Mental Math Tricks vs The observatory

The clearest difference is in-app purchases: The observatory at none against Mental Math Tricks's 2. The observatory also leads on update cadence (weekly vs every 4 months). Mental Math Tricks's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

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

Mental Math Tricks ships an update every 4 months, The observatory weekly. The most recent releases landed on October 12, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Mental Math Tricks | The observatory |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mental-math-tricks-mathmind/id6763278096/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 38 MB | 100 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rouba Kiprianos](https://appshunter.io/developer/1895243777) | [Axel Jesus Gonzalez Alcibar](https://appshunter.io/developer/1004350529) |

## What reviewers say

### Mental Math Tricks

[App page](https://appshunter.io/ios/app/mental-math-tricks-mathmind/id6763278096)

Master mental math techniques to calculate faster than a calculator. Learn proven tricks for multiplication, division, percentages, and more through clear explanations, practice drills, and timed challenges. Track your progress and build a consistent learning habit.

**Highlights:** 30 proven mental math tricks, Techniques for multiplication, division, percentages, fractions, and more, Step-by-step explanations and 'why it works' sections, Infinite auto-generated practice problems, Timed challenges and daily challenges, Progress tracking with speed graphs and day streaks

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard Unlock | $2.99 | one-time |
| Pro Unlock | $4.99 | one-time |


### The observatory

[App page](https://appshunter.io/ios/app/the-observatory-daily-word/id6772073045)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mental Math Tricks free?

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

### Is The observatory free?

The observatory is free to download, with no in-app purchases.

### Do Mental Math Tricks or The observatory have ads?

The observatory shows ads; Mental Math Tricks does not.

### Which is updated more often, Mental Math Tricks or The observatory?

Mental Math Tricks ships an update every 4 months, and The observatory weekly. Most recently, Mental Math Tricks was updated on October 12, 2026 and The observatory on October 28, 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.*