# Mnemo Major System Trainer vs Skim

The clearest difference is price: Skim at Free against Mnemo Major System Trainer's $12.99. Skim also leads on rating (5.0 vs 4.4) and update cadence (every 2 weeks vs every 2 months). Mnemo Major System Trainer's advantage is in-app purchases (none vs 4) and ratings volume (18 vs 3). On ads there is nothing between them.

Skim is free to download; Mnemo Major System Trainer costs $12.99 up front. Skim sells 4 in-app purchases, starting at $6.99 per month. Mnemo Major System Trainer asks for nothing beyond the download.

Skim holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Mnemo Major System Trainer has 18 ratings behind it against 3, so its average is the more settled of the two.

Mnemo Major System Trainer ships an update every 2 months, Skim every 2 weeks. The most recent releases landed on October 20, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Mnemo Major System Trainer | Skim |
| --- | --- | --- |
| Price | $12.99 | **Free** |
| Rating | [4.4 (18 ratings)](https://appshunter.io/ios/app/mnemo-major-system-trainer/id649905769/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/skim-micro-learning-cards/id6764439998/reviews)** |
| Number of ratings | **18** | 3 |
| Positive reviews | 88.1% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Paid | **Freemium** |
| Size | 54 MB | 10 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Gerald Reindl](https://appshunter.io/developer/649905772) | [DORUK SAVASAN](https://appshunter.io/developer/1895781498) |

## What reviewers say

### Mnemo Major System Trainer

[App page](https://appshunter.io/ios/app/mnemo-major-system-trainer/id649905769)

Learn and master the Major System, a powerful mnemonic technique for remembering numbers. This app offers an integrated training program with visual aids and statistics to help you create and optimize your personalized number-to-image encoding system.

**Highlights:** Personalized Major System creation, Integrated training program, Reaction time analysis, Number sequence to image generator, Pre-installed Major System (0-99), Customizable terms and images, CSV Import/Export

**Features:** Vision Pro support

**In-app purchases:** none


### Skim

[App page](https://appshunter.io/ios/app/skim-micro-learning-cards/id6764439998)

Transform documents into bite-sized learning cards with AI. Choose from four learning modes, ask questions about terms, and track your progress. Ideal for students, researchers, and professionals.

**Highlights:** AI-generated learning cards, Multiple learning modes (Deep Understanding, ELI5, Memorize, Quick Review), Ask AI questions about document terms, Progress tracking (streak, mastery, accuracy), Supports PDF, Word, PowerPoint, text, and Markdown, No ads or data tracking

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $6.99 | per month |
| Ultra Monthly | $13.99 | per month |
| Pro Annual | $69.99 | per year |
| Ultra Annual | $139.99 | per year |


## Frequently asked questions

### Is Mnemo Major System Trainer free?

Mnemo Major System Trainer costs $12.99, with no in-app purchases.

### Is Skim free?

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

### Which has better reviews, Mnemo Major System Trainer or Skim?

Skim is rated higher. Mnemo Major System Trainer averages 4.4 out of 5 from 18 ratings, while Skim averages 5.0 from 3 ratings.

### Do Mnemo Major System Trainer or Skim have ads?

Neither Mnemo Major System Trainer nor Skim shows ads.

### Which is updated more often, Mnemo Major System Trainer or Skim?

Mnemo Major System Trainer ships an update every 2 months, and Skim every 2 weeks. Most recently, Mnemo Major System Trainer was updated on October 20, 2026 and Skim on October 7, 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.*