IMU Step vs RF OS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
IMU Step
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.
- Real-time load metric analysis
- Lower limb asymmetry identification
- Cloud-based dashboard insights
- Live data streaming
- Session video recording
- Sensor data download
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IMU Step removes the guesswork from an injured athlete’s Return-to-Play journey. Small, synchronized, high-frequency waterproof sensors are placed on the interior of the left and right ankles delivering load metrics to running sports athletes. It enables precise, actionable insights, identifying and quantifying the impact of each step, helping monitor and identify asymmetries of the lower limbs via cloud based dashboards. With IMU Step iOS, you can select the athlete who is training, add contextual information on their session, and view live data on an Apple device streamed directly from the sensors. Live metrics such as intensity are calculated and displayed in real-time, alongside the ability to record and save video footage of your session. You can also download data recorded by the sensors using IMU Step Desktop for PC and Mac for analysis via the IMU Step online dashboard. IMU Step iOS is only compatible with IMeasureU’s BlueTrident Inertial Sensors running firmware 10.0.1 and above.
RF OS
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A mobile app for anyone running a tournaments.
Screenshots
Verdict
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.
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.
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.
| Parameter | IMU Step | RF OS |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 8 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 31 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | I Measure U | RF Labs, Inc. |
In-app purchases
IMU Step
No in-app purchases
RF OS
No in-app purchases
