# DR. KAISER vs HP arms

The clearest difference is iOS requirement: HP arms at 12.0 against DR. KAISER's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

DR. KAISER ships an update every 5 months, HP arms every 6 months. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | DR. KAISER | HP arms |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 6 months |
| Size | 27 MB | 45 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DR. KAISER DIAMANTWERKZEUGE GmbH & Co. KG](https://appshunter.io/developer/1392887718) | [Renishaw plc](https://appshunter.io/developer/943016056) |

## What reviewers say

### DR. KAISER

[App page](https://appshunter.io/ios/app/dr-kaiser/id1392887719)

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

**In-app purchases:** none


### HP arms

[App page](https://appshunter.io/ios/app/hp-arms/id1441014006)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DR. KAISER free?

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

### Is HP arms free?

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

### Do DR. KAISER or HP arms have ads?

Neither DR. KAISER nor HP arms shows ads.

### Which is updated more often, DR. KAISER or HP arms?

DR. KAISER ships an update every 5 months, and HP arms every 6 months. Most recently, DR. KAISER was updated on October 29, 2026 and HP arms on October 28, 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.*