RPM Calculator vs Pre
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RPM Calculator
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The World's only app to help you calculate the cutting speed (RPM) for Annular Cutters and Magnetic Drills. This fully automated app can not only be used for BDS Maschinen GmbH products but also for products from other brands. This new RPM Calculator App can be used completely offline, independent of internet connectivity. This is how the App works...Select the model the magnetic drill you have, select the type of material you are drilling, select the type of annular cutter you are using, select the diameter of the annular cutter in millimeters or in inches and just press the Calculate button. Within a fraction of second, the App delivers the result informing you of the required cutting speed (RPM) for the size of the annular cutter as well as on which Gear you need to set your BDS Magnetic Drill.
Pre
This app guides users through pre-alignment tasks using a connected Bluetooth probe. It allows measurement and recording of run-out, bearing clearance, and soft foot, with the ability to generate instant PDF reports.
- Bluetooth connectivity
- Icon-based adaptive user interface
- Measure and record Run-Out
- Measure and record Bearing Clearance
- Measure and record True SoftCheck
- Generate instant PDF reports
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This is a companion app for performing pre-alignment tasks, using the RT-300/AT-10. The app guides the user through the complete pre-alignment process when using the Bluetooth® connected ACOEM Run-Out Probe. This offers a complete pre-alignment package, including the possibility to measure and record Run-Out, Bearing Clearance, and True SoftCheck. The PDF Report function provides a fast on-site reporting capability by converting saved measurement reports into PDF files. ---- Note: This app works with the ACOEM Run-Out Probe ---- Key Features: - Connected using Bluetooth® - GuideU: Our patented icon-based and color-coded adaptive user interface - Measure and record Run-Out, Bearing Clearance and True SoftCheck. - True SoftCheck - soft foot measurements directly on the feet of the machine. - Create an instant PDF-report Visit the website www.acoem.com for more information on alignment in general, the ACOEM tools and support of the app.
Screenshots
Verdict
The clearest difference is update cadence: RPM Calculator at fortnightly against Pre's every 7 months. RPM Calculator also leads on iOS requirement (10.0 vs 13.0). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
RPM Calculator ships an update fortnightly, Pre every 7 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.
| Parameter | RPM Calculator | Pre |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Fortnightly — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 16 MB | 67 MB |
| Age rating | 4+ | 4+ |
| Developer | BDS Maschinen GmbH (Germany) | ACOEM Group |
In-app purchases
RPM Calculator
No in-app purchases
Pre
No in-app purchases









