# PVT Research Tool vs memoryOS

The clearest difference is review sentiment: memoryOS at 80% against PVT Research Tool's 33%. memoryOS also leads on rating (4.9 vs 4.0) and ratings volume (17K vs 8). PVT Research Tool's advantage is in-app purchases (none vs 28) and iOS requirement (12.1 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. PVT Research Tool asks for nothing beyond the download.

memoryOS holds the better App Store score, 4.9 against 4.0. 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 point the same way: 33% of PVT Research Tool's written reviews are positive against 80% of memoryOS's.

## The numbers

| Metric | PVT Research Tool | memoryOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (8 ratings)](https://appshunter.io/ios/app/pvt-research-tool/id1475726298/reviews) | **[4.9 (17K ratings)](https://appshunter.io/ios/app/memoryos-memory-games/id1553283646/reviews)** |
| Number of ratings | 8 | **17K** |
| Positive reviews | 33.3% of reviews | **80.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 2 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | — | **#56** |
| Size | 30 MB | 231 MB |
| Requires iOS | **12.1** | 15.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The Texas A&M University System CSE](https://appshunter.io/developer/1462337505) | [Encoder Inc.](https://appshunter.io/developer/1524669695) |

## What reviewers say

### PVT Research Tool

[App page](https://appshunter.io/ios/app/pvt-research-tool/id1475726298)

This application assists researchers in gathering data on alertness changes related to fatigue. It is designed to measure reaction times and assess the impact of sleep loss or extended wakefulness.

**Highlights:** Measures reaction time, Assesses fatigue-related changes, Collects research data, Supports sleep loss studies, Evaluates alertness

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is PVT Research Tool free?

PVT Research Tool is free to download, with no in-app purchases.

### Is memoryOS free?

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

### Which has better reviews, PVT Research Tool or memoryOS?

memoryOS is rated higher. PVT Research Tool averages 4.0 out of 5 from 8 ratings, while memoryOS averages 4.9 from 17K ratings.

### Do PVT Research Tool or memoryOS have ads?

Neither PVT Research Tool nor memoryOS shows ads.

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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.*