# memoryOS vs Master Any Stack

The clearest difference is price: memoryOS at Free against Master Any Stack's $14.99. memoryOS also leads on rating (4.9 vs 3.0) and ratings volume (16K vs 4). Master Any Stack's advantage is in-app purchases (none vs 28) and iOS requirement (13.0 vs 15.2). On update cadence, ads and device support there is nothing between them.

memoryOS is free to download; Master Any Stack costs $14.99 up front. memoryOS sells 20 in-app purchases, starting at $3.99 per 7 days. Master Any Stack asks for nothing beyond the download.

memoryOS holds the better App Store score, 4.9 against 3.0. That said, the two scores are not equally well evidenced: memoryOS has 16K ratings behind it against 4, 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 67% of Master Any Stack's.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 3, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | memoryOS | Master Any Stack |
| --- | --- | --- |
| Price | **Free** | $14.99 |
| Rating | **[4.9 (16K ratings)](https://appshunter.io/ios/app/memoryos-memory-games/id1553283646/reviews)** | [3.0 (4 ratings)](https://appshunter.io/ios/app/master-any-stack/id1639475883/reviews) |
| Number of ratings | **16K** | 4 |
| Positive reviews | **80.5% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | **#44** | — |
| Size | 248 MB | 22 MB |
| Requires iOS | 15.2 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Encoder Inc.](https://appshunter.io/developer/1524669695) | [The Daily Magician Ltd.](https://appshunter.io/developer/1650401526) |

## What reviewers say

### memoryOS

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

**Currently charting:** #44 Top Grossing · Education, #106 Top Free · Education (US App Store)

Enhance your memory and focus with interactive lessons and a virtual mind palace game. Learn scientifically proven techniques to improve knowledge retention and recall a wide range of information, from names and numbers to complex data and entire books.

**Highlights:** Interactive bite-sized lessons, Virtual Mind Palaces game, Spaced repetition system, Scientifically proven techniques, Improve knowledge retention, Memorize diverse information

**Features:** Vision Pro support

**In-app purchases (20)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Student Weekly Plan | $3.99 | per 7 days |
| Student Monthly Plan | $4.99 | per month |
| Expert Weekly Plan | $6.99 | per 7 days |
| Essential Weekly Plan | $6.99 | per 7 days |
| Essential Monthly Plan | $14.99 | per month |
| Essential Monthly Plan | $14.99 | per month |
| Student 3 Months Plan | $19.99 | per 3 months |
| Expert Monthly Plan | $24.99 | per month |
| Expert 3 Months Plan | $49.99 | per 3 months |
| Expert 3 Months Plan | $69.99 | per 3 months |
| Expert 6 Months Plan | $89.99 | per 6 months |
| Essential Annual Plan | $89.99 | per year |
| Essential Annual Plan | $89.99 | per year |
| Essential Annual Plan | $89.99 | per year |
| Expert Annual Plan | $148.99 | per year |
| Expert Annual Plan | $149.99 | per year |
| Expert Annual Plan | $149.99 | per year |
| 10 Hearts | $0.99 | one-time |
| 10 Loci Coins | $2.99 | one-time |
| 50 Loci Coins | $14.99 | one-time |

**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


### Master Any Stack

[App page](https://appshunter.io/ios/app/master-any-stack/id1639475883)

Learn to memorize the order of a deck of cards with this user-friendly app. It offers video and text training on a unique memorization method, allows customization of stacks, and provides various practice modes to help you master card sequences.

**Highlights:** Learn memorization method via video and text, Create and practice custom card stacks, Practice specific sections of the deck, Utilize P.A.O. (Person, Action, Object) method, Timed and free play practice modes, Track daily practice streaks

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

**In-app purchases:** none


## Frequently asked questions

### Is memoryOS free?

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

### Is Master Any Stack free?

Master Any Stack costs $14.99, with no in-app purchases.

### Which has better reviews, memoryOS or Master Any Stack?

memoryOS is rated higher. memoryOS averages 4.9 out of 5 from 16K ratings, while Master Any Stack averages 3.0 from 4 ratings.

### Do memoryOS or Master Any Stack have ads?

Neither memoryOS nor Master Any Stack shows ads.

### Which is updated more often, memoryOS or Master Any Stack?

memoryOS ships an update every 3 weeks, and Master Any Stack every 3 weeks. Most recently, memoryOS was updated on October 3, 2026 and Master Any Stack on September 20, 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.*