# Reflex: Brain reaction

> Train your cognitive abilities & fluid intelligence. Improve your reaction speed

Canonical page: [https://chrome-stats.com/d/brain.reaction.concentration](https://chrome-stats.com/d/brain.reaction.concentration)

## Overview

- **ID:** `brain.reaction.concentration`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Kranus Company
- **Category:** GAME\_EDUCATIONAL
- **Downloads:** 425,809
- **Rating:** 4.76 / 5 (10,930 ratings)
- **Version:** 14.8
- **Last updated:** 2026-08-18
- **First published:** 2021-07-03
- **Publisher country:** UA
- **Size:** 25 MB
- **Data as of:** 2026-09-24
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=brain.reaction.concentration)
- **Website:** [https://kranus.com](https://kranus.com/)
- **Privacy policy:** [http://kranus.com/reflex/policy](http://kranus.com/reflex/policy)

## Description

**Reflex: Brain Reaction** is a dynamic Chrome extension designed to enhance your cognitive abilities and fluid intelligence through engaging brain games and teasers. Tailored to boost mental quickness, processing speed, working memory, mathematical skills, and problem-solving, it offers personalized daily workouts that adapt to your progress, keeping you continually challenged.

The extension features detailed progress tracking with graphs, rankings, and achievement badges to motivate and celebrate milestones. The renowned Dual N-Back task is included, targeting working memory and boosting fluid intelligence. Accessible for free with optional subscriptions for advanced exercises and statistics, Reflex provides a smooth, well-designed interface proven popular among users. Start training your brain today and unlock your full mental potential!

## Rankings

- #109,066 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_ADSERVICES_AD_ID`
- `android.permission.ACCESS_ADSERVICES_ATTRIBUTION`
- `android.permission.ACCESS_ADSERVICES_TOPICS`
- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.ACCESS_WIFI_STATE`
- `android.permission.FOREGROUND_SERVICE`
- `android.permission.INTERNET`
- `android.permission.POST_NOTIFICATIONS`
- `android.permission.VIBRATE`
- `android.permission.WAKE_LOCK`
- `brain.reaction.concentration.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`
- `com.android.vending.BILLING`
- `com.applovin.array.apphub.permission.BIND_APPHUB_SERVICE`
- `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE`
- `com.google.android.gms.permission.AD_ID`

## Review summary

Across reviews, Reflex: Brain reaction is praised for solid quality and a positive user experience. Many users call it good or very good, and describe it as enjoyable to use, with some noting it’s educational and helpful. A few reviews go further, calling it amazing and fun for reaction training. Minor criticisms do exist, such as mentions of unnecessary features wasting time or concerns about authenticity, but these are not widely echoed. Overall, the app is seen as engaging, easy to pick up, and effective for quick reflex practice.

### Pros

- Good / very good overall quality
- Engaging and enjoyable to use
- Helpful and educational

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Source: [Chrome-Stats](https://chrome-stats.com/d/brain.reaction.concentration)