Peak Flow
Measure your attention, distractibility and focus over time with validated cognitive tests — and train them.
What it measures
Three short tests
Reaction Time (PVT)
1–5 min · the daily testHow fast you respond to a simple signal, and how often your attention lapses entirely.
Impulse Control (SART)
~2 minRespond to most things, hold back on one — it shows how well you catch yourself on autopilot.
Interference (Stroop)
~1 minName the ink colour, not the word. It measures how well you filter conflicting information.
Train it
Measurement, then practice
Guided breath focus
Adaptive check-insA calm paced session that asks, at widening intervals, whether your mind had wandered — the spacing adapts to how you answer.
Breath counting
Self-pacedCount each exhale to nine and begin again. Your count itself is the measurement, so nothing is shown on screen.
Median reaction time
ms · 7 days312 ms → 259 ms
Reaction test
tap when redmilliseconds
Illustrative sample screens — not real results.
Who built it
Physician-led
Peak Flow is built by Dr. Sanjeev Goel, MD, as part of Peak Human. The tests are adapted from tasks used in attention research, and the app is deliberately plain about what a score can and cannot tell you.
Your data stays yours
Your cognitive data is private. Only you can ever see your results, and you can export or delete everything at any time.
Read the privacy pagePeak Flow measures how your attention performs day to day. It is not a medical device and does not diagnose ADHD, dementia, concussion, or any other condition. A single result mostly reflects sleep, time of day, and practice — look at the trend, not the number. If you're worried about your memory or concentration, talk to your physician.