# Mental Abacus vs Logical Fallacy Memory

The clearest difference is price: Logical Fallacy Memory at Free against Mental Abacus's $8.99. Logical Fallacy Memory also leads on update cadence (every 2 weeks vs every 13 months). Mental Abacus's advantage is rating (3.9 vs 1.0) and in-app purchases (none vs 2). On ads there is nothing between them.

Logical Fallacy Memory is free to download; Mental Abacus costs $8.99 up front. Logical Fallacy Memory sells 2 in-app purchases, starting at $1.99 per month. Mental Abacus asks for nothing beyond the download.

Mental Abacus holds the better App Store score, 3.9 against 1.0. That said, the two scores are not equally well evidenced: Mental Abacus has 7 ratings behind it against 1, so its average is the more settled of the two.

Mental Abacus ships an update every 13 months, Logical Fallacy Memory every 2 weeks. The most recent releases landed on October 8, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Mental Abacus | Logical Fallacy Memory |
| --- | --- | --- |
| Price | $8.99 | **Free** |
| Rating | **[3.9 (7 ratings)](https://appshunter.io/ios/app/mental-abacus/id489127101/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/logical-fallacy-memory/id6484316242/reviews) |
| Number of ratings | **7** | 1 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 2 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 17 MB | 7 MB |
| Requires iOS | **15.0** | 17 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hamster Force Multimedia Ltd.](https://appshunter.io/developer/443416476) | [山 汪](https://appshunter.io/developer/1740449088) |

## What reviewers say

### Mental Abacus

[App page](https://appshunter.io/ios/app/mental-abacus/id489127101)

Master abacus mental arithmetic with illustrated tutorials and a step-by-step demonstrator. Practice calculations on a virtual abacus and learn the two-hands fingering method to enhance right brain functions. Ideal for self-learning addition and subtraction.

**Highlights:** Illustrated tutorials, Step-by-step demonstrator, Virtual abacus practice, Two hands fingering method, Addition and subtraction, Rapid calculation exercises

**Features:** Vision Pro support

**In-app purchases:** none


### Logical Fallacy Memory

[App page](https://appshunter.io/ios/app/logical-fallacy-memory/id6484316242)

Master common logical fallacies and enhance your critical thinking skills. This app uses active recall and spaced repetition to help you identify reasoning errors in real-world situations. Track your progress with a personalized mastery map and learn over 60 unique fallacies.

**Highlights:** Active recall testing, Spaced repetition learning, Personalized mastery map, Identify over 60 fallacies, Real-world scenario analysis

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access (1 Month) | $1.99 | per month |
| All Access (1 Year) | $11.99 | per year |


## Frequently asked questions

### Is Mental Abacus free?

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

### Is Logical Fallacy Memory free?

Logical Fallacy Memory is free to download, with in-app purchases available.

### Which has better reviews, Mental Abacus or Logical Fallacy Memory?

Mental Abacus is rated higher. Mental Abacus averages 3.9 out of 5 from 7 ratings, while Logical Fallacy Memory averages 1.0 from 1 ratings.

### Do Mental Abacus or Logical Fallacy Memory have ads?

Neither Mental Abacus nor Logical Fallacy Memory shows ads.

### Which is updated more often, Mental Abacus or Logical Fallacy Memory?

Mental Abacus ships an update every 13 months, and Logical Fallacy Memory every 2 weeks. Most recently, Mental Abacus was updated on October 8, 2026 and Logical Fallacy Memory on October 2, 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.*