# memoryOS vs Proportion_Calculator

The clearest difference is review sentiment: memoryOS at 80% against Proportion_Calculator's 0%. memoryOS also leads on rating (4.9 vs 2.0) and update cadence (every 3 weeks vs every 24 months). Proportion_Calculator's advantage is in-app purchases (none vs 28) and iOS requirement (13.0 vs 15.2). On price, ads and device support there is nothing between them.

Both are free to download. memoryOS sells 23 in-app purchases, starting at $3.99 per 7 days. Proportion_Calculator asks for nothing beyond the download.

memoryOS holds the better App Store score, 4.9 against 2.0. 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. Written reviews point the same way: 80% of memoryOS's written reviews are positive against 0% of Proportion_Calculator's.

memoryOS ships an update every 3 weeks, Proportion_Calculator every 24 months. The most recent releases landed on October 16, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | memoryOS | Proportion_Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (17K ratings)](https://appshunter.io/ios/app/memoryos-memory-games/id1553283646/reviews)** | [2.0 (2 ratings)](https://appshunter.io/ios/app/proportion-calculator/id1601421898/reviews) |
| Number of ratings | **17K** | 2 |
| Positive reviews | **80.5% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 24 months |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#62** | — |
| Size | 248 MB | 19 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) | [Ahmad Sattar](https://appshunter.io/developer/1458483953) |

## What reviewers say

### memoryOS

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

**Currently charting:** #62 Top Grossing · Education, #104 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


### Proportion_Calculator

[App page](https://appshunter.io/ios/app/proportion-calculator/id1601421898)

This app helps you find the unknown value in proportions by showing step-by-step calculations. It's useful for various applications, from cooking to science, and offers a simple, fast, and visually appealing way to solve proportion problems.

**Highlights:** Solves for unknown values in proportions, Provides labeled step-by-step explanations, Fast calculation speed, User-friendly interface, Math keyboard for easy input, Smart, eye-friendly color theme

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is memoryOS free?

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

### Is Proportion_Calculator free?

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

### Which has better reviews, memoryOS or Proportion_Calculator?

memoryOS is rated higher. memoryOS averages 4.9 out of 5 from 17K ratings, while Proportion_Calculator averages 2.0 from 2 ratings.

### Do memoryOS or Proportion_Calculator have ads?

Neither memoryOS nor Proportion_Calculator shows ads.

### Which is updated more often, memoryOS or Proportion_Calculator?

memoryOS ships an update every 3 weeks, and Proportion_Calculator every 24 months. Most recently, memoryOS was updated on October 16, 2026 and Proportion_Calculator 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.*