Comparison

GROB⁴Line vs DR. KAISER

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

GROB⁴Line

Features
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GROB-NET⁴Industry uses web technology to create cross-plant transparency throughout the production process. The applications within GROB-NET⁴Industry modularly developed by GROB, network and digitalize production processes to facilitate paperless communication – for even greater productivity. Through the management of users and solutions, GROB4Portal is the safe entry to the digital world. GROB4Line allows a GROB machine to be connected to the Internet. Consequently, it can be monitored and controlled via a smartphone. Combined with the notification function which sends messages (e.g. machine shutdown, alarm messages or job finished) to defined smartphones, the machine operator concerned can respond immediately and minimize unnecessary downtimes. • Mobile, dynamic display of machine data • Information about status, alarm messages, tool and NC program at a glance • E-mail notification for machine shutdown • Definition of alarm messages for proactive e-mail notification • Mobile monitoring of unmanned and lightly-manned machine operation • Historical timeline diagram

About

DR. KAISER

Features
Read full description

The new DR. KAISER app makes it possible to calculate all relevant parameters related to dressing and grinding. The app is aimed at inexperienced users as well as experts. Guided-Mode The new Guided-Mode guides you step-by-step through the selection of the optimal dressing parameters for your grinding application. Expert mode The Expert-Mode supports experienced users in the calculation of dressing parameters. Export function All calculated parameters can be exported and archived as a PDF file. For this purpose, the app offers the option of providing the calculated parameters with information on the user, machine and application. Multilingual The app can be set to different languages to provide full functionality to all users. Metric and imperial system All parameters can be calculated in metric or imperial system, so that all users can work with their preferred units.

Screenshots

GROB⁴Line4 screens
DR. KAISER4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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.

Scorecard1 real difference · 5 level
GROB⁴Line versus DR. KAISER: the parameters behind the verdict, then further details
ParameterGROB⁴LineDR. KAISER
PriceFreeFree
Update frequencyEvery 2 months — betterEvery 5 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size16 MB27 MB
Age rating4+4+
DeveloperGROB-WERKE GmbH & Co. KGDR. KAISER DIAMANTWERKZEUGE GmbH & Co. KG

In-app purchases

None

GROB⁴Line

No in-app purchases

None

DR. KAISER

No in-app purchases

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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