# Stroop Effect vs memoryOS

The clearest difference is in-app purchases: Stroop Effect at none against memoryOS's 28. Stroop Effect also leads on iOS requirement (11.0 vs 15.2). memoryOS's advantage is update cadence (every 3 weeks vs every 10 months) and chart position (#41 vs unranked). On price, ads and device support there is nothing between them.

Both are free to download. memoryOS sells 20 in-app purchases, starting at $3.99 per 7 days. Stroop Effect asks for nothing beyond the download.

Stroop Effect ships an update every 10 months, memoryOS every 3 weeks. The most recent releases landed on September 20, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Stroop Effect | memoryOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (16K ratings)](https://appshunter.io/ios/app/memoryos-memory-games/id1553283646/reviews)** |
| Number of ratings | — | **16K** |
| Positive reviews | — | 80.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Best chart rank | — | **#41** |
| Size | 58 MB | 248 MB |
| Requires iOS | **11.0** | 15.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Michal Mandrysz](https://appshunter.io/developer/454758944) | [Encoder Inc.](https://appshunter.io/developer/1524669695) |

## What reviewers say

### Stroop Effect

[App page](https://appshunter.io/ios/app/stroop-effect-tot/id1443395928)

**Features:** macOS Compatibility

**In-app purchases:** none


### memoryOS

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

**Currently charting:** #41 Top Grossing · Education, #121 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


## Frequently asked questions

### Is Stroop Effect free?

Stroop Effect is free to download, with no in-app purchases.

### Is memoryOS free?

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

### Do Stroop Effect or memoryOS have ads?

Neither Stroop Effect nor memoryOS shows ads.

### Which is updated more often, Stroop Effect or memoryOS?

Stroop Effect ships an update every 10 months, and memoryOS every 3 weeks. Most recently, Stroop Effect was updated on September 20, 2026 and memoryOS on September 30, 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.*