# GROB⁴Line vs DR. KAISER

The clearest difference is update cadence: GROB⁴Line at every 2 months against DR. KAISER's every 5 months. On price, ads, in-app purchases and device support there is nothing between them.

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

GROB⁴Line ships an update every 2 months, DR. KAISER every 5 months. The most recent releases landed on October 26, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | GROB⁴Line | DR. KAISER |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Size | 16 MB | 27 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GROB-WERKE GmbH & Co. KG](https://appshunter.io/developer/1126270873) | [DR. KAISER DIAMANTWERKZEUGE GmbH & Co. KG](https://appshunter.io/developer/1392887718) |

## What reviewers say

### GROB⁴Line

[App page](https://appshunter.io/ios/app/grobline/id1126270874)

**Features:** Vision Pro support

**In-app purchases:** none


### DR. KAISER

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

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

**In-app purchases:** none


## Frequently asked questions

### Is GROB⁴Line free?

GROB⁴Line is free to download, with no in-app purchases.

### Is DR. KAISER free?

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

### Do GROB⁴Line or DR. KAISER have ads?

Neither GROB⁴Line nor DR. KAISER shows ads.

### Which is updated more often, GROB⁴Line or DR. KAISER?

GROB⁴Line ships an update every 2 months, and DR. KAISER every 5 months. Most recently, GROB⁴Line was updated on October 26, 2026 and DR. KAISER 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.*