# REACTRA — Perceive. Calibrate. React. > Visual reaction and attention training experiments using touch and camera input. (iPhone/iPad app by Brandon Durr.) - Source: https://appshunter.io/ios/app/reactra/id6808385850 (this page in markdown: same URL + `.md`) - Developer: [Brandon Durr](https://appshunter.io/developer/6791444539) - Category: Health & Fitness, Sports - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 15.1 · 141 MB - Languages: American English, Arabic, Czech, Danish, Dutch, Finnish, French (France), German (Germany), Greek, Hebrew and 17 more - Released: 2026-09-22 - Data updated: 2026-10-06 - Monetization: free ## What is REACTRA? Something on your screen is about to change. Most people miss it. Reactra is a set of fast, strange visual experiments that test what your eyes catch — and what they don't. Every round takes seconds. Every result is a little humbling. You'll want to go again. CAN YOU CATCH IT? Spot the change before it's gone. Find the one that moved. Pick the real signal out of the noise. Don't fall for the fake-out. 20+ experiments, each one designed to trick your attention. YOUR CAMERA BECOMES THE GAME No controller. Just your hands. Reach the green zone and stay out of the red in Color Call. Switch sides as fast as you can in Side Switch. Freeze your hand dead still in Move & Hold. Memorize a pattern and reach it back in Sequence Reach. TRAIN YOUR EYES Go / No-Go: tap on green, hold on red, and don't bite. Peripheral Flash: catch what blinks at the edge without moving your eyes. Plus Reaction Arena, Number Grid, Precision Tracking and Stroop Focus. CHALLENGE YOUR FRIENDS Every run gets a challenge code. Send it, and your friend plays the exact same round. Same experiment, same difficulty, no excuses. THE IMPOSSIBLE ROUND A new near-impossible challenge every week. Almost nobody clears it. FEELS DIFFERENT EVERY DAY New Today, Hard Mode, Mystery Experiments and a daily Community Challenge everyone plays together. YOU VS. YOURSELF Reactra Records tracks your fastest reactions, best accuracy and hardest level passed, so you always know what to beat. MORE THAN A GAME Record a movement and play it back. Mark up your form frame by frame. Check in on how your body feels before you train. Built for athletes, but anyone can play. So — what will you miss today? Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Key features - Fast visual experiments - Camera-based gameplay - Multiplayer challenges - Daily community challenges - Personal progress tracking - Frame-by-frame playback ## Frequently asked questions about REACTRA ### What is REACTRA? REACTRA is a collection of visual experiments designed to test and improve your attention and reaction time. It uses your device's camera and touch input for interactive gameplay. ### How does REACTRA work? The app presents various visual challenges that require you to quickly spot changes, track moving objects, or maintain precise movements. Each experiment is designed to be fast and engaging. ### Can I challenge my friends in REACTRA? Yes, you can challenge friends by sharing a challenge code. They will then play the exact same round and experiment, allowing for direct comparison. ### What kind of experiments are available in REACTRA? REACTRA features over 20 experiments, including 'Color Call' where you stay in a green zone, 'Side Switch' to change sides quickly, and 'Move & Hold' to freeze your hand still. ### Does REACTRA offer daily challenges? Yes, REACTRA includes a daily Community Challenge that everyone plays together, as well as a weekly 'Impossible Round' for a near-impossible test of skill. ### How does REACTRA track my progress? REACTRA Records monitors your fastest reactions, best accuracy, and highest level passed. This allows you to see your improvements and set new personal bests. ### Is REACTRA suitable for all ages? REACTRA has an age rating of 4+, making it accessible for a wide range of users. It's built for athletes but enjoyable for anyone looking to train their eyes. ### Does REACTRA have ads? No, REACTRA is ad-free, allowing for an uninterrupted experience during its visual experiments and challenges. ## Version history (last 3 releases) ### 1.0.2 — 2026-10-02 New games and a smoother, sharper camera. - 4 new games: Go / No-Go and Peripheral Flash (Vision), Color Call and Side Switch (Camera) - Move & Hold rebuilt: 6 rounds, longer holds, a steadiness score, and it knows if your hand really stayed put - Camera games now line up exactly with your camera, so zones register where you reach - Fairer Sequence Reach, Color Call, and Timing Strike - Record shows bigger, and your actual video now saves and plays back - Form Analysis: upload button and markers fixed, plus frame-by-frame stepping - Bigger, higher-contrast game screens - Target Strike retired - Bug fixes and polish ### 1.0.1 — 2026-09-29 Reactra Play is here: perceptual experiments across six engines that test what you actually notice under pressure, not just how fast you tap. Finish a round and share the challenge code — whoever you send it to plays the identical experiment, same seed, same level. Discover serves you something new each day, with The Impossible Round when you want humbling. Reactra Records keeps your personal bests, and Form Analysis lets you annotate a movement frame by frame and compare two takes side by side. ### 1.0 — 2026-09-22 No release notes. ## More apps by Brandon Durr - [AthleteMania](https://appshunter.io/ios/app/athletemania/id6791444537) - [AthleteMania Mind](https://appshunter.io/ios/app/athletemania-mind/id6808386789) All apps by Brandon Durr: https://appshunter.io/developer/6791444539 --- *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 2026-10-06.*