NeuroMetric DSS — Brain Processing-Speed & Reaction-Time Test

Measure how fast your brain works — in 90 seconds, right on your phone.

Your brain has a "speed" — how quickly it takes in information and reacts — and it changes with sleep, stress, fatigue, training, and recovery. Most people never actually measure it. NeuroMetric DSS lets you check it in about a minute and a half, whenever you want.

The test is simple: symbols are matched to numbers, and you tap the number that goes with each symbol as fast and accurately as you can for 90 seconds. Behind that simple game, the app is timing every single response to the millisecond and turning it into real, trackable numbers.

What it measures

• Processing speed — how quickly your brain works, in plain numbers
• Reaction time — timed to the millisecond on every tap
• Accuracy and consistency — how steady your focus holds up

How it works

1. Sign in with Google — your results are private and tied to your account.
2. Take the 90-second test — tap the number that matches each symbol.
3. See your score instantly — and watch your trend build over time.

What's included

• The NeuroMetric DSS app for Android
• Secure Google sign-in — one account across the whole NeuroMetric suite
• Automatic, private cloud save of every session
• Instant results: your processing-speed score, average reaction time, accuracy, and a tap-by-tap reaction-time chart
• A fast, repeatable check you can run every day

Who it's for

• Anyone tracking mental sharpness — before and after sleep, light therapy, exercise, travel, or a hard day
• Coaches, clinicians, and researchers who want objective, repeatable numbers
• Biohackers and anyone optimizing focus, energy, and recovery

Backed by real science

NeuroMetric DSS is built on the Digit Symbol Substitution Test, one of the most widely used and trusted measures of cognitive processing speed in research and medicine for decades — reimagined for your phone, with reaction-time precision a paper-and-pencil version simply can't capture.

NeuroMetric DSS is a wellness and self-tracking tool for general and research use. It is not a medical device and does not diagnose, treat, or cure any condition. If you have health concerns, please consult a qualified professional.

Digital download — instant access after purchase.