# SRM PM9 vs CT School

SRM PM9 and CT School are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SRM PM9 ships an update every 2 months, CT School every 6 weeks. The most recent releases landed on October 10, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | SRM PM9 | CT School |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/srm-pm9/id1568305482/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 26 MB | 32 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ulrich Schoberer](https://appshunter.io/developer/1051801775) | [Arbox LTD](https://appshunter.io/developer/1021244486) |

## What reviewers say

### 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


### CT School

[App page](https://appshunter.io/ios/app/ct-school/id6511231162)

**In-app purchases:** none


## Frequently asked questions

### Is SRM PM9 free?

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

### Is CT School free?

CT School is free to download, with no in-app purchases.

### Do SRM PM9 or CT School have ads?

Neither SRM PM9 nor CT School shows ads.

### Which is updated more often, SRM PM9 or CT School?

SRM PM9 ships an update every 2 months, and CT School every 6 weeks. Most recently, SRM PM9 was updated on October 10, 2026 and CT School on October 18, 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.*