# Citizen Science vs memoryOS

The clearest difference is review sentiment: memoryOS at 80% against Citizen Science's 0%. memoryOS also leads on update cadence (every 2 weeks vs every 4 months) and chart position (#64 vs unranked). Citizen Science's advantage is in-app purchases (none vs 28). On price, ads, device support and iOS requirement there is nothing between them.

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

Citizen Science ships an update every 4 months, memoryOS every 2 weeks. The most recent releases landed on October 16, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Citizen Science | memoryOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (17K ratings)](https://appshunter.io/ios/app/memoryos-memory-games/id1553283646/reviews)** |
| Number of ratings | — | **17K** |
| Positive reviews | 0.0% of reviews | **80.4% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | — | **#64** |
| Size | 34 MB | 248 MB |
| Requires iOS | **15.0** | 15.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NEW ZEALAND INSTITUTE FOR EARTH SCIENCE LIMITED](https://appshunter.io/developer/896687691) | [Encoder Inc.](https://appshunter.io/developer/1524669695) |

## What reviewers say

### Citizen Science

[App page](https://appshunter.io/ios/app/citizen-science/id1439168937)

Contribute to real scientific research by easily entering data for various surveys. Participate in projects like snow depth measurement or storm assessment, with your submissions visible on a dedicated website. This platform facilitates public involvement in scientific discovery and data collection.

**Highlights:** Public data entry for scientific surveys, Variety of seasonal and year-round projects, View submissions on the Citizen Science website, Data usable by professional and amateur researchers, Surveys can be restricted to specific user groups, Data accessible via comprehensive API

**Features:** Vision Pro support

**In-app purchases:** none


### memoryOS

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

**Currently charting:** #64 Top Grossing · Education, #95 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 Citizen Science free?

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

### Is memoryOS free?

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

### Do Citizen Science or memoryOS have ads?

Neither Citizen Science nor memoryOS shows ads.

### Which is updated more often, Citizen Science or memoryOS?

Citizen Science ships an update every 4 months, and memoryOS every 2 weeks. Most recently, Citizen Science was updated on October 16, 2026 and memoryOS on October 18, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*