# memoryOS vs Mahj Trainer

The clearest difference is ads: memoryOS at none against Mahj Trainer's shown. memoryOS also leads on ratings volume (17K vs 36) and rating (4.9 vs 4.7). On price, review sentiment, update cadence and in-app purchases there is nothing between them.

Both are free to download. memoryOS sells 9 in-app purchases, starting at $5.99 per month and Mahj Trainer sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

memoryOS holds the better App Store score, 4.9 against 4.7. That said, the two scores are not equally well evidenced: memoryOS has 17K ratings behind it against 36, so its average is the more settled of the two. Written reviews point the same way: 80% of memoryOS's written reviews are positive against 75% of Mahj Trainer's.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | memoryOS | Mahj Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (17K ratings)](https://appshunter.io/ios/app/memoryos-memory-games/id1553283646/reviews)** | [4.7 (36 ratings)](https://appshunter.io/ios/app/mahj-trainer-mahjong-practice/id6790052126/reviews) |
| Number of ratings | **17K** | 36 |
| Positive reviews | **80.2% of reviews** | 75.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#63** | — |
| Size | 232 MB | 32 MB |
| Requires iOS | **15.2** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Encoder Inc.](https://appshunter.io/developer/1524669695) | [Jack Wallner](https://appshunter.io/developer/1891233967) |

## What reviewers say

### memoryOS

[App page](https://appshunter.io/ios/app/memoryos-memory-games/id1553283646)

**Currently charting:** #63 Top Grossing · Education, #76 Top Free · Education (US App Store)

Enhance your memory with interactive lessons and a 3D virtual mind palace game. This app uses scientifically proven techniques like spaced repetition to boost long-term memory storage and knowledge retention. It's designed to make memorization skills joyful and effective for everyone.

**Highlights:** Interactive memory lessons, 3D Virtual Mind Palaces, Spaced repetition system, Gamified learning, Memorize names, lists, numbers, and more, Advanced study techniques

**Features:** Vision Pro support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Student Monthly Plan | $5.99 | per month |
| Essential Weekly Plan | $6.99 | per 7 days |
| Essential Monthly Plan | $15.99 | per month |
| Expert Monthly Plan | $27.99 | per month |
| Essential Annual Plan | $89.99 | per year |
| Expert Annual Plan | $148.99 | per year |
| Expert Annual Plan | $149.99 | per year |
| Expert Annual Plan | $159.99 | per year |
| Expert Annual Plan | $159.99 | per year |

**What reviewers like**

- 🚀 Effective memory techniques
- 👍 Interactive and engaging
- 💡 Innovative use of memory palaces
- 🤩 Impressive results in a short time
- 🎉 Fun and enjoyable to use

**What reviewers complain about**

- 💰 Expensive subscription model
- 🐛 Buggy and crashes frequently
- 🤔 Confusing navigation and UI
- 🔒 Lack of transparency around pricing
- 🙄 Aggressive upselling and marketing tactics

**Reported bugs**

- Login issues and account management problems
- Frequent crashes and app instability
- Navigation and UI elements not working as expected
- Syncing issues between devices and lost progress
- Connectivity problems when using cellular data

**Requested features**

- More free content and lessons
- Ability to create custom memory palaces
- Better progress tracking and analytics
- Integration with other learning/productivity apps
- Offline mode for lessons and memory palaces


### Mahj Trainer

[App page](https://appshunter.io/ios/app/mahj-trainer-mahjong-practice/id6790052126)

This app offers focused drills to help new players learn American Mah Jongg. Practice tile recognition, card reading, Charleston strategy, and judgment calls in short, interactive sessions. It provides a pressure-free environment to build essential skills before playing with others.

**Highlights:** Tile recognition drills, Card section learning, Charleston strategy practice, Keep-or-throw judgment calls, Interactive rack reading, Spaced repetition for weak spots

**Features:** iPhone Duo support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mahj+ Monthly | $9.99 | per month |
| Mahj+ Yearly | $39.99 | per year |
| Mahj+ Lifetime | $89.99 | one-time |


## Frequently asked questions

### Is memoryOS free?

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

### Is Mahj Trainer free?

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

### Which has better reviews, memoryOS or Mahj Trainer?

memoryOS is rated higher. memoryOS averages 4.9 out of 5 from 17K ratings, while Mahj Trainer averages 4.7 from 36 ratings.

### Do memoryOS or Mahj Trainer have ads?

Mahj Trainer shows ads; memoryOS does not.

### Which is updated more often, memoryOS or Mahj Trainer?

memoryOS ships an update fortnightly, and Mahj Trainer fortnightly. Most recently, memoryOS was updated on November 8, 2026 and Mahj Trainer on November 5, 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.*