ROTOR Power vs SRM PM9
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ROTOR Power
This app helps cyclists optimize their performance by updating power meter firmware, checking device battery, and analyzing pedaling biomechanics. It provides real-time training data, workout history, and syncs with popular third-party fitness platforms.
- Firmware updates
- Device battery check
- Pedaling biomechanics analysis (TORQUE 360, OCA, OCP)
- Real-time power and cadence metrics
- Workout history and .fit export
- Bluetooth connectivity
- Third-party app syncing (Strava, Training Peaks)
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ROTOR Power is the ideal tool to keep your power meter updated and to improve your pedaling biomechanics thanks to TORQUE 360, OCA, OCP and many more. What do we offer you? - Update the firmware when a new version is available. - Check your device battery and calibrate your ROTOR device easily step by step. - Check your OCA (Optimum Chainring Angle) and your OCP (Optimum Chainring Position) for Q Rings on your iOS devices thanks to TORQUE 360. Download the data of TORQUE 360 graph as CSV file to analyze your results. - Metrics like power or cadence could be used when you ride to improve your training sessions. - Real-time data on your sessions as every GPS device. - A history of all your workouts. Download the summaries of these workouts in .fit format and check the data with your favorite training program. - Improved connectivity via Bluetooth which means a faster pairing of your sensors and the app. - Sync your activities with third-party applications such as Strava or Training Peaks.
SRM PM9
This app provides advanced power measurement for cyclists, offering high accuracy in various conditions. It features magnet-less cadence, left/right balance, and pedal smoothness analysis, connecting seamlessly with ANT+ and Bluetooth devices.
- Magnet-less cadence
- Left/Right balance measurement
- Pedal smoothness analysis
- Automatic temperature compensation
- ANT+ and Bluetooth LE connectivity
- Rechargeable battery
- Zwift compatible
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Our 9th generation Spider PowerMeter takes our proven formula and updates it with modern features. The result is a PowerMeter that is easier to use, even more accurate, better to repair and has improved connectivity. Thanks to a combination of angle and torque measurement, the PM9 is now able to measure with higher accuracy in very low cadence situations and not round chainrings do no longer have an impact on the recorded data. The integrated temperature sensor allows for maximum accuracy in changing conditions. Users are now able to show L&R balance, as well as combined Pedal smoothness. PowerMeter 9 comes with many usability improvements. First of all is the Magnet-less cadence mode, which allows you to use the PowerMeter without any cadence magnet. PowerMeter 9 can be used with ANT+ and Bluetooth LE. It connects to pretty much any head unit and comes with a mobile App. The App gives you access to live torque data, battery status information, firmware updates and much more. Features: • Magnet-less cadence • Left / Right Balance • Combined Pedal smoothness • Not round chainrings compatible • Automatic temperature compensation with sensor • Rechargeable via magnetic charger • 100 h battery runtime between charges • Compatible with Head-Units using ANT+™ and Bluetooth® • Zwift™ compatible
Screenshots
Verdict
The clearest difference is iOS requirement: ROTOR Power at 13.0 against SRM PM9's 15.1. 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.
ROTOR Power ships an update every 5 months, SRM PM9 every 2 months. The most recent releases landed on September 10, 2026 and June 3, 2026 respectively.
| Parameter | ROTOR Power | SRM PM9 |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | 9.1% of reviews | — |
| Number of ratings | — | 2 — better |
| Update frequency | Every 5 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 31 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | ROTOR Bike Components | Ulrich Schoberer |
Customer experience
ROTOR Power
SRM PM9
In-app purchases
ROTOR Power
No in-app purchases
SRM PM9
No in-app purchases
