# IMU Step vs RF OS

The clearest difference is update cadence: RF OS at monthly against IMU Step's every 8 months. On price, ads, in-app purchases and device support there is nothing between them.

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

IMU Step ships an update every 8 months, RF OS monthly. The most recent releases landed on September 28, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | IMU Step | RF OS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/imu-step/id1348032758/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Monthly** |
| Monetization | Free | — |
| Size | 31 MB | 39 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [I Measure U](https://appshunter.io/developer/1035194936) | [RF Labs, Inc.](https://appshunter.io/developer/1592838182) |

## What reviewers say

### IMU Step

[App page](https://appshunter.io/ios/app/imu-step/id1348032758)

This app helps injured athletes return to play by analyzing their movement with waterproof sensors. It provides precise load metrics and identifies asymmetries in lower limbs, offering actionable insights through cloud-based dashboards. Monitor live data, record video, and download sensor data for detailed analysis.

**Highlights:** Real-time load metric analysis, Lower limb asymmetry identification, Cloud-based dashboard insights, Live data streaming, Session video recording, Sensor data download

**In-app purchases:** none


### RF OS

[App page](https://appshunter.io/ios/app/rf-os/id6748840322)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is IMU Step free?

IMU Step is free to download, with no in-app purchases.

### Is RF OS free?

RF OS is free to download, with no in-app purchases.

### Do IMU Step or RF OS have ads?

Neither IMU Step nor RF OS shows ads.

### Which is updated more often, IMU Step or RF OS?

IMU Step ships an update every 8 months, and RF OS monthly. Most recently, IMU Step was updated on September 28, 2026 and RF OS on September 14, 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.*