# memoryOS vs Zetamac problems

The clearest difference is in-app purchases: Zetamac problems at none against memoryOS's 10. memoryOS's advantage is ads (none vs shown) and ratings volume (17K vs 2). On price, rating, device support and iOS requirement there is nothing between them.

Both are free to download. memoryOS sells 9 in-app purchases, starting at $5.99 per month. Zetamac problems asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for memoryOS against 5.0 for Zetamac problems. That said, the two scores are not equally well evidenced: memoryOS has 17K ratings behind it against 2, so its average is the more settled of the two.

memoryOS ships an update fortnightly, Zetamac problems every 2 months. The most recent releases landed on November 10, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | memoryOS | Zetamac problems |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (17K ratings)](https://appshunter.io/ios/app/memoryos-memory-games/id1553283646/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/zetamac-problems/id6743952737/reviews)** |
| Number of ratings | **17K** | 2 |
| Positive reviews | 80.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Best chart rank | **#54** | — |
| Size | 232 MB | 4 MB |
| Requires iOS | **15.2** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Encoder Inc.](https://appshunter.io/developer/1524669695) | [Chhaya Patel](https://appshunter.io/developer/1736176770) |

## What reviewers say

### memoryOS

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

**Currently charting:** #54 Top Grossing · Education, #87 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


### Zetamac problems

[App page](https://appshunter.io/ios/app/zetamac-problems/id6743952737)

Sharpen your math skills with daily practice covering various problem types. Customize difficulty, practice under timed conditions, and receive instant feedback to prepare for exams and interviews.

**Highlights:** Diverse math problem types, Customizable number range, Timed practice mode, Realistic quantitative problem simulations, Instant feedback

**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 Zetamac problems free?

Zetamac problems is free to download, with no in-app purchases.

### Which has better reviews, memoryOS or Zetamac problems?

Zetamac problems is rated higher. memoryOS averages 4.9 out of 5 from 17K ratings, while Zetamac problems averages 5.0 from 2 ratings.

### Do memoryOS or Zetamac problems have ads?

Zetamac problems shows ads; memoryOS does not.

### Which is updated more often, memoryOS or Zetamac problems?

memoryOS ships an update fortnightly, and Zetamac problems every 2 months. Most recently, memoryOS was updated on November 10, 2026 and Zetamac problems on November 8, 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.*