# Hourglass vs RadMonJP

The clearest difference is in-app purchases: Hourglass at none against RadMonJP's 6. Hourglass also leads on iOS requirement (16.0 vs 26.0). RadMonJP's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. RadMonJP sells 6 in-app purchases, starting at $0.99 per month. Hourglass asks for nothing beyond the download.

Hourglass ships an update every 4 days, RadMonJP every 8 days. Both last shipped on October 19, 2026.

## The numbers

| Metric | Hourglass | RadMonJP |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 8 days |
| Size | 27 MB | 10 MB |
| Requires iOS | **16.0** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [kenji abe](https://appshunter.io/developer/1461779902) | [RR Aware Studio](https://appshunter.io/developer/1439301679) |

## What reviewers say

### Hourglass

[App page](https://appshunter.io/ios/app/hourglass-physics-simulation/id6670490622)

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

**In-app purchases:** none


### RadMonJP

[App page](https://appshunter.io/ios/app/radmonjp/id6737837347)

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム1ヶ月 | $0.99 | per month |
| Bronze | $4.99 | per year |
| Silver sponsor | $9.99 | per year |
| Gold sponsor | $19.99 | per year |
| Platinum sponsor | $49.99 | per year |
| Diamond sponsor | $99.99 | per year |


## Frequently asked questions

### Is Hourglass free?

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

### Is RadMonJP free?

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

### Do Hourglass or RadMonJP have ads?

Hourglass shows ads; RadMonJP does not.

### Which is updated more often, Hourglass or RadMonJP?

Hourglass ships an update every 4 days, and RadMonJP every 8 days. Most recently, Hourglass was updated on October 19, 2026 and RadMonJP on October 19, 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.*