CATService vs Pre
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CATService
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This app requires external measurement hardware to operate. This app is a custom-made app for Caterpillar to conduct engine vibration test and crankshaft deflection test. The vibration test function connects iPad to the Data Acquisition Box and collects in real time the Overall RMS Vibration (Acceleration, Velocity and Displacement). Real time vibration spectrum is also displayed. The crankshaft deflection test function works with Motionics wireless measurement read (WiMER). When the sensor is attached and connected, users can wirelessly capture sensor readings at 5 testing positions on crankshaft via Bluetooth Low Energy. Crank web vertical and horizontal deflections are automatically calculated once 5 readings are collected. Testing report is generated after each test. It also enables importing and merging PDF reports created by other Apps. User can easily get access to saved reports via a report manager. FEATURES: Vibration Test: - Real-Time Overall RMS values - Vibration Signal Spectrum/Waveform - Vibration in Velocity (ips or mm/s) or Acceleration (G's) - User can select from different industrial severity standards - User can define customized alarm and danger values - Signal Averaging option Crankshaft Deflection Test: - Wireless sensor connectivity - Test information editing - Sensor measuring crankshaft rotating angle and indicator showing test positions - Crankshaft end play test included - Auto calculating vertical and horizontal deflections Report Generation: - Test report generation including engine information, measurement values, data plots, note, signature, location information - Email PDF report and wireless printing - Report manager available - Import and merge reports from other Apps
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 price: Pre at Free against CATService's $450.00. Pre also leads on update cadence (every 7 months vs every 15 months) and device support (3 vs 1). On ads, in-app purchases and iOS requirement 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
Pre is free to download; CATService costs $450.00 up front. Neither carries in-app purchases, so what you see is what you pay.
CATService ships an update every 15 months, Pre every 7 months. The most recent releases landed on October 6, 2026 and September 28, 2026 respectively.
| Parameter | CATService | Pre |
|---|---|---|
| Price | $450.00 | Free — better |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 15 months | Every 7 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 13 MB | 67 MB |
| Age rating | 4+ | 4+ |
| Developer | Motionics LLC | ACOEM Group |
In-app purchases
CATService
No in-app purchases
Pre
No in-app purchases









