# Mental Abacus Book 3 vs Satellite Chasers

The clearest difference is price: Satellite Chasers at Free against Mental Abacus Book 3's $8.99. Satellite Chasers also leads on update cadence (monthly vs every 20 months). Mental Abacus Book 3's advantage is in-app purchases (none vs 2) and iOS requirement (8.0 vs 15.0). On ads and device support there is nothing between them.

Satellite Chasers is free to download; Mental Abacus Book 3 costs $8.99 up front. Satellite Chasers sells 2 one-off in-app purchases. Mental Abacus Book 3 asks for nothing beyond the download.

Mental Abacus Book 3 ships an update every 20 months, Satellite Chasers monthly. The most recent releases landed on October 26, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Mental Abacus Book 3 | Satellite Chasers |
| --- | --- | --- |
| Price | $8.99 | **Free** |
| Rating | — | **[4.6 (27 ratings)](https://appshunter.io/ios/app/satellite-chasers/id1505877457/reviews)** |
| Number of ratings | — | **27** |
| Positive reviews | — | 76.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 20 months | **Monthly** |
| Monetization | — | Free with in-app purchases |
| Size | 13 MB | 34 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hamster Force Multimedia Ltd.](https://appshunter.io/developer/443416476) | [Austin Griffith](https://appshunter.io/developer/1505877456) |

## What reviewers say

### Mental Abacus Book 3

[App page](https://appshunter.io/ios/app/mental-abacus-book-3/id1054868136)

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

**In-app purchases:** none


### Satellite Chasers

[App page](https://appshunter.io/ios/app/satellite-chasers/id1505877457)

Explore the cosmos with this app that tracks nearly 50,000 orbital objects using augmented reality. Discover when satellites will be overhead, read space news, and customize their appearance. Compete with friends on a leaderboard and personalize your viewing experience.

**Highlights:** Track 50,000+ orbital objects, Augmented Reality satellite viewing, Real-time satellite addition, Overhead pass notifications, Integrated space news, Satellite customization, Leaderboard and friend system

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |
| Remove Ads & Buy Me A Coffee | $4.99 | one-time |


## Frequently asked questions

### Is Mental Abacus Book 3 free?

Mental Abacus Book 3 costs $8.99, with no in-app purchases.

### Is Satellite Chasers free?

Satellite Chasers is free to download, with in-app purchases available.

### Do Mental Abacus Book 3 or Satellite Chasers have ads?

Neither Mental Abacus Book 3 nor Satellite Chasers shows ads.

### Which is updated more often, Mental Abacus Book 3 or Satellite Chasers?

Mental Abacus Book 3 ships an update every 20 months, and Satellite Chasers monthly. Most recently, Mental Abacus Book 3 was updated on October 26, 2026 and Satellite Chasers on November 3, 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.*