# ROTOR Power vs SRM PM9

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.

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 October 24, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | ROTOR Power | SRM PM9 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/srm-pm9/id1568305482/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 9.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 31 MB | 26 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ROTOR Bike Components](https://appshunter.io/developer/1210670819) | [Ulrich Schoberer](https://appshunter.io/developer/1051801775) |

## What reviewers say

### ROTOR Power

[App page](https://appshunter.io/ios/app/rotor-power/id1216141058)

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.

**Highlights:** 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)

**Features:** macOS Compatibility

**In-app purchases:** none


### SRM PM9

[App page](https://appshunter.io/ios/app/srm-pm9/id1568305482)

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.

**Highlights:** Magnet-less cadence, Left/Right balance measurement, Pedal smoothness analysis, Automatic temperature compensation, ANT+ and Bluetooth LE connectivity, Rechargeable battery, Zwift compatible

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ROTOR Power free?

ROTOR Power is free to download, with no in-app purchases.

### Is SRM PM9 free?

SRM PM9 is free to download, with no in-app purchases.

### Do ROTOR Power or SRM PM9 have ads?

Neither ROTOR Power nor SRM PM9 shows ads.

### Which is updated more often, ROTOR Power or SRM PM9?

ROTOR Power ships an update every 5 months, and SRM PM9 every 2 months. Most recently, ROTOR Power was updated on October 24, 2026 and SRM PM9 on October 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*