# memoryOS vs Delphi

The clearest difference is in-app purchases: Delphi at none against memoryOS's 10. memoryOS's advantage is ratings volume (17K vs 1) and update cadence (fortnightly vs every 5 weeks). On price, rating, ads and device support there is nothing between them.

Both are free to download. memoryOS sells 9 in-app purchases, starting at $5.99 per month. Delphi asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for memoryOS against 5.0 for Delphi. That said, the two scores are not equally well evidenced: memoryOS has 17K ratings behind it against 1, so its average is the more settled of the two.

memoryOS ships an update fortnightly, Delphi every 5 weeks. The most recent releases landed on November 9, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | memoryOS | Delphi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (17K ratings)](https://appshunter.io/ios/app/memoryos-memory-games/id1553283646/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/delphi-ai-ortho-case-prep/id6670274807/reviews)** |
| Number of ratings | **17K** | 1 |
| Positive reviews | 80.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#68** | — |
| Size | 232 MB | 77 MB |
| Requires iOS | 15.2 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Encoder Inc.](https://appshunter.io/developer/1524669695) | [PrecisionOS](https://appshunter.io/developer/1765571367) |

## What reviewers say

### memoryOS

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

**Currently charting:** #68 Top Grossing · Education, #70 Top Free · Education (US App Store)

Enhance your memory with interactive lessons and a 3D virtual mind palace game. This app uses scientifically proven techniques like spaced repetition to boost long-term memory storage and knowledge retention. It's designed to make memorization skills joyful and effective for everyone.

**Highlights:** Interactive memory lessons, 3D Virtual Mind Palaces, Spaced repetition system, Gamified learning, Memorize names, lists, numbers, and more, Advanced study techniques

**Features:** Vision Pro support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Student Monthly Plan | $5.99 | per month |
| Essential Weekly Plan | $6.99 | per 7 days |
| Essential Monthly Plan | $15.99 | per month |
| Expert Monthly Plan | $27.99 | per month |
| Essential Annual Plan | $89.99 | per year |
| Expert Annual Plan | $148.99 | per year |
| Expert Annual Plan | $149.99 | per year |
| Expert Annual Plan | $159.99 | per year |
| Expert Annual Plan | $159.99 | per year |

**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


### Delphi

[App page](https://appshunter.io/ios/app/delphi-ai-ortho-case-prep/id6670274807)

This AI-powered assistant helps orthopedic professionals prepare for cases by providing cited answers from trusted medical sources. It integrates with VR surgical training to offer practice scenarios and detailed performance insights.

**Highlights:** AI-personalized case preparation, Cited answers from trusted medical sources, Direct links to VR practice cases, Step-by-step visual guides, Personalized answer length and format, Upload personal case materials

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is memoryOS free?

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

### Is Delphi free?

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

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

Delphi is rated higher. memoryOS averages 4.9 out of 5 from 17K ratings, while Delphi averages 5.0 from 1 ratings.

### Do memoryOS or Delphi have ads?

Neither memoryOS nor Delphi shows ads.

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

memoryOS ships an update fortnightly, and Delphi every 5 weeks. Most recently, memoryOS was updated on November 9, 2026 and Delphi on November 8, 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.*