# memoryOS vs cards.study

The clearest difference is ratings volume: memoryOS at 17K against cards.study's 8. memoryOS also leads on chart position (#56 vs unranked) and iOS requirement (15.2 vs 17.0). cards.study's advantage is review sentiment (100% vs 80%). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. memoryOS sells 23 in-app purchases, starting at $3.99 per 7 days and cards.study sells 1 in-app purchase, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.9 for memoryOS against 5.0 for cards.study. That said, the two scores are not equally well evidenced: memoryOS has 17K ratings behind it against 8, so its average is the more settled of the two. Written reviews are what separate them: 80% of memoryOS's written reviews are positive against 100% of cards.study's.

memoryOS ships an update every 2 weeks, cards.study every 4 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | memoryOS | cards.study |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (17K ratings)](https://appshunter.io/ios/app/memoryos-memory-games/id1553283646/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/cardsstudy-trivia-flashcards/id6737521915/reviews)** |
| Number of ratings | **17K** | 8 |
| Positive reviews | 80.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 4 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#56** | — |
| Size | 231 MB | 43 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) | [Ben Jenkins](https://appshunter.io/developer/1776903367) |

## What reviewers say

### memoryOS

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

**Currently charting:** #56 Top Grossing · Education, #85 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 (23)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Student Weekly Plan | $3.99 | per 7 days |
| Student Monthly Plan | $5.99 | 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 |
| Essential Monthly Plan | $16.99 | per month |
| Student 3 Months Plan | $19.99 | per 3 months |
| Expert Monthly Plan | $24.99 | per month |
| Expert Monthly Plan | $29.99 | 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 | $174.99 | per year |
| Expert Annual Plan | $174.99 | 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


### cards.study

[App page](https://appshunter.io/ios/app/cardsstudy-trivia-flashcards/id6737521915)

Master subjects like languages and trivia with a spaced-repetition flashcard system. Create your own study materials or use pre-made courses. Gain insights into your learning progress with advanced statistics.

**Highlights:** Spaced-repetition algorithm, Pre-made courses, Custom card editor, Advanced statistics, Trivia and language learning

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access | $5.99 | per month |


## Frequently asked questions

### Is memoryOS free?

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

### Is cards.study free?

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

### Which has better reviews, memoryOS or cards.study?

cards.study is rated higher. memoryOS averages 4.9 out of 5 from 17K ratings, while cards.study averages 5.0 from 8 ratings.

### Do memoryOS or cards.study have ads?

Neither memoryOS nor cards.study shows ads.

### Which is updated more often, memoryOS or cards.study?

memoryOS ships an update every 2 weeks, and cards.study every 4 weeks. Most recently, memoryOS was updated on October 24, 2026 and cards.study on October 24, 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.*