# Reaction RD

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

- Source: https://appshunter.io/ios/app/reaction-rd/id1050398610 (this page in markdown: same URL + `.md`)
- Developer: [Viacheslav Romanenko](https://appshunter.io/developer/1046372418)
- Category: Education, Sports
- Price: $0.99
- Age rating: 4+
- Requires: iOS 12.0 · 9 MB
- Languages: English
- Released: 2015-10-28
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/reaction-rd/id1050398610/reviews.md

## What is Reaction RD?

Testing sensorimotor reaction. Reaction of distinguishing. This app allows to define ability of the user to differentiate false and real visual signals. False signals are signals which are in a circle, real beyond its limits. Time received in this test characterizes distinction reaction time.


## Version history (last 5 releases)

### 1.1.1 — 2020-11-08

Bug fixes and stability improvements.

### 1.1.0 — 2020-06-06

Bug fixes and stability improvements.

### 1.0.9 — 2020-04-20

Some bugs were fixed.

### 1.0.8 — 2019-10-04

Some bugs were fixed.

### 1.0.7 — 2019-07-06

Some bugs were fixed.
Model characteristics which will allow to determine the level of user’s reaction of distinguishing were added.
Possibilities of changing numbers of attempts were expanded.

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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 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.*