# QMemo vs World Prism

The clearest difference is in-app purchases: QMemo at none against World Prism's 3. QMemo also leads on iOS requirement (15.1 vs 17.0). World Prism's advantage is update cadence (every 3 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. World Prism sells 3 one-off in-app purchases. QMemo asks for nothing beyond the download.

QMemo ships an update every 3 weeks, World Prism every 3 days. The most recent releases landed on September 18, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | QMemo | World Prism |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Size | 36 MB | 10 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [kazu kaneko](https://appshunter.io/developer/1838478015) | [Daisaku Seto](https://appshunter.io/developer/1889853807) |

## What reviewers say

### QMemo

[App page](https://appshunter.io/ios/app/qmemo-memory-trigger/id6754830887)

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

**In-app purchases:** none


### World Prism

[App page](https://appshunter.io/ios/app/world-prism/id6761618784)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| にゃんパトロン | $1.99 | one-time |
| もふもふパトロン | $4.99 | one-time |
| 金毛パトロン | $9.99 | one-time |


## Frequently asked questions

### Is QMemo free?

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

### Is World Prism free?

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

### Do QMemo or World Prism have ads?

Neither QMemo nor World Prism shows ads.

### Which is updated more often, QMemo or World Prism?

QMemo ships an update every 3 weeks, and World Prism every 3 days. Most recently, QMemo was updated on September 18, 2026 and World Prism on September 23, 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.*