EXFO OPM vs Pre
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
EXFO OPM
This application connects to specific EXFO optical power meters and checkers via Bluetooth to display live measurements. It allows users to manage test configurations, store and edit measurement data, add GPS coordinates, and generate shareable PDF reports.
- Bluetooth connectivity to EXFO devices
- Live measurement display
- Measurement storage and management
- Test configuration management
- PDF test report generation
- GPS coordinate tagging
- JSON export for MPC-100
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The EXFO OPM [Optical Power Meter] application can connect over Bluetooth™ to both EXFO’s PON Power meters (PPM-350D), and power checkers (MPC-100 series). When connected, the app can display live measurements and store measurements, along with the following advanced/additional features: - Manage test configurations (import, delete, sync with instrument) - Select a test configuration to use on the instrument - View test configuration details - Manage measurements (edit name and identification information, export, delete) - Add GPS coordinates to a measurement - View saved measurement details - Generate a PDF test report for a measurement - Share a PDF test report. Specifically for the MPC-100: - Supports Duplex measurements storing values on the transmit (Tx) and Receive (Rx) side on the same window and in the same report. - Export of the results in .JSON format
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 rating: Pre at 5.0 against EXFO OPM's 1.0. EXFO OPM's advantage is ratings volume (6 vs 1) and iOS requirement (10.0 vs 13.0). On price, update cadence, ads and in-app purchases 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.
Pre holds the better App Store score, 5.0 against 1.0. That said, the two scores are not equally well evidenced: EXFO OPM has 6 ratings behind it against 1, so its average is the more settled of the two.
Both ship on a similar rhythm, roughly every 7 months. The most recent releases landed on September 25, 2026 and September 28, 2026 respectively.
| Parameter | EXFO OPM | Pre |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (6 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 6 — better | 1 |
| Update frequency | Every 7 months | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 62 MB | 67 MB |
| Age rating | 4+ | 4+ |
| Developer | EXFO Inc. | ACOEM Group |
Customer experience
EXFO OPM
Pre
In-app purchases
EXFO OPM
No in-app purchases
Pre
No in-app purchases









