Reaction Lab - Reflex Tests
Improve Your Reaction Time
About
Measure and improve your response speed with a suite of scientifically-inspired tests. Track progress over time with detailed analytics and gain insights into your performance in various situations. Designed for focus and privacy, all data stays on your device.
What's New in Reaction Lab
1.0
January 21, 2026
Subscription plans
React Fast Yearly
Yearly Access
Developer apps
FAQ
What is Reaction Lab?
Reaction Lab is a suite of tests designed to measure and help you improve your reaction time. It offers various test types to assess different response pathways and provides detailed analytics on your performance over time.
What types of reaction tests does Reaction Lab offer?
Reaction Lab includes simple visual tap, choice reaction, audio reaction, haptic reaction, grip-release, motion reaction, dual-task under load, fatigue drift, anticipation vs reaction, and asymmetry testing.
How does Reaction Lab track progress?
The app automatically saves your sessions and provides session summaries (median, average, best, worst, variability), accuracy metrics, and trend charts for different test types over 7, 30, or 90 days.
Is Reaction Lab free to use?
Reaction Lab is free to download and use. It offers optional subscription plans for enhanced features, with a 3-day free trial available for monthly and yearly subscriptions.
Does Reaction Lab have ads?
No, Reaction Lab does not contain advertisements. It is designed to be a distraction-free tool for testing and improving reaction time.
Is my data private with Reaction Lab?
Yes, Reaction Lab is fully on-device and private. Your data stays on your device, with no accounts, cloud sync, or tracking required, and it works offline.
What are the subscription options for Reaction Lab?
Reaction Lab offers two subscription plans: React Fast Monthly for $1.99/month and React Fast Yearly for $4.99/year. Both plans include a 3-day free trial.
What devices is Reaction Lab compatible with?
Reaction Lab is currently supported on iPhone devices. It was last updated on January 21, 2026, with version 1.0.
