# Reaction RMO Pro

> Reaction RMO Pro (iPhone/iPad app by Viacheslav Romanenko.)

- Source: https://appshunter.io/ios/app/reaction-rmo-pro/id1666660660 (this page in markdown: same URL + `.md`)
- Developer: [Viacheslav Romanenko](https://appshunter.io/developer/1046372418)
- Category: Health & Fitness, Education
- Price: $1.99
- Age rating: 4+
- Requires: iOS 14.0 · 2 MB
- Languages: English
- Released: 2023-06-19
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/reaction-rmo-pro/id1666660660/reviews.md

## What is Reaction RMO Pro?

This app allows you to determine the user's ability to react to a moving object.
One of the methods for monitoring the functional state of the human central nervous system is to determine the ratio of excitation and inhibition processes during the reaction to a moving object (RMO). 

The human reaction to a moving object refers to the ability to determine the spatial and temporal parameters of the visual stimulus movement, and to quickly and accurately perform the necessary actions in response. To perform the test tasks, you need to click on the red circle when it matches the blue one. 
When performing this test, you can choose one of three testing modes. Each test task consists of three stages. You can choose between 10 to 30 attempts per stage.

The demo mode 'Demo' allows for trial attempts.
The standard mode 'Main mode' offers a test task where the visual stimulus speed is low in the first stage, increases by 1.5 times in the second stage, and has added distracting visual stimuli in the third stage. 
The 'Slow mode' offers a test task where the visual stimulus speed is low in all stages. The 'Fast mode' offers a test task where the visual stimulus speed is high in all stages.

The program provides the following information about the measurements:
- average value of the reaction (by module) for the whole test (Mean, ms), standard deviation (SD, ms);
- the predominant direction of excitation or inhibition processes for the entire test ("Premature" - premature reactions, "Delayed" - reactions with a delay, "Accurate" - accurate reactions);
- number of attempts in the stage;
- test mode;
- average values of reactions (by module, ms), standard deviations (ms), Shapiro-Wilk criterion (W) for each stage separately;
- percentage of reactions for the entire test ("Premature, %" - premature reactions, "Delayed, %" - reactions with a delay, "Accurate, %" - accurate reactions).
This app can be used by athletes and teachers of specialised educational institutions in their scientific research.

The “Reaction RMO Pro“ app includes a machine learning model (Core ML) that automatically determines the level of reaction to a moving object based on the results of a 3-stage test. The algorithm takes into account the relationship between reaction speed and performance stability by analysing both overall test indicators - mean reaction time and mean standard deviation - and the dynamics of changes in results as task difficulty increases.
The result is presented as a reaction-to-a-moving-object level (High / Medium / Low) and an integral index. This makes it possible to use the app for regular monitoring of athletes’ psychophysiological functions, tracking individual changes over time, and selecting training tasks according to the athlete’s current condition.

All calculations are performed locally on the device, without transmitting personal data to a server. Test results should be interpreted considering the athlete’s level of preparedness, testing conditions, and repeated-measurement dynamics. The app is not a medical device and is not intended to provide medical diagnoses.


## Version history (last 5 releases)

### 1.0.7 — 2026-05-12

Fixed some bugs.

### 1.0.5 — 2026-02-25

This update includes performance improvements and bug fixes.

### 1.0.4 — 2025-10-20

This update includes performance improvements and bug fixes.

### 1.0.3 — 2025-02-20

Some errors were corrected.

### 1.0.2 — 2023-11-07

Some errors were corrected.

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## More apps by Viacheslav Romanenko

- [Reaction SM](https://appshunter.io/ios/app/reaction-sm/id1046372419)
- [Reaction SR](https://appshunter.io/ios/app/reaction-sr/id1047244230)
- [Reaction RC](https://appshunter.io/ios/app/reaction-rc/id1048447733)
- [Reaction RMO](https://appshunter.io/ios/app/reaction-rmo/id1049901807)
- [Reaction RD](https://appshunter.io/ios/app/reaction-rd/id1050398610)
- [Reaction CDO](https://appshunter.io/ios/app/reaction-cdo/id1051308948)

All apps by Viacheslav Romanenko: https://appshunter.io/developer/1046372418

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-19.*