ADHD is a difference in how the brain regulates attention: not how much focus you have, but how reliably you can aim it, hold it, and stop it. It starts in childhood, often persists into adulthood, and it says nothing about intelligence or effort. This page explains how it shows up in adult life, and gives you an objective way to see where your attention sits.
No symptom checklists. Short, real cognitive tasks that run in your browser and compare how your attention performs against typical adult ranges.
ADHD is a developmental difference in the brain systems that regulate attention and action: aiming focus where you choose, holding it there when the task is dull, and stopping a response that is already underway. The name is misleading. It is not a shortage of attention so much as inconsistent control over it: the same person who loses an afternoon to something fascinating can find twenty minutes of paperwork physically difficult. It shows up in childhood, often runs in families, and frequently persists: current estimates put it at roughly 2.5% of adults worldwide. It also does not always look restless. Some people mainly drift, some mainly act before thinking, and many do both.
If you grew up when ADHD meant a boy bouncing off classroom walls, you may have spent decades with a private explanation instead: lazy, scattered, careless, not living up to potential. Many adults with real attention differences hold degrees and demanding jobs, and quietly spend enormous energy compensating: alarms behind alarms, deadline adrenaline, working late to recover hours that evaporated. The difficulty is real and specific. It is not intelligence, and it is not effort.
A careful note. Attention struggles for many reasons. Poor sleep, anxiety, depression, chronic stress, and some medical issues can all produce the same day-to-day picture, and they overlap. No web page and no online tool can tell you which applies to you. ADHD is a clinical diagnosis, made by a professional through interviews, developmental history, and standardized rating scales, and much of what defines it is not cognitive performance at all. What a good screening can do is measure the attention dimensions that can be measured, objectively, so that conversation starts from data instead of doubt.
Adult ADHD is rarely dramatic. It looks like a set of small, persistent frictions that other people seem not to have, and like the workarounds you have built to route around them.
You read a page and realize nothing landed. In long meetings you surface to find ten minutes gone. Focus arrives on its own schedule, not yours.
You walk into a room and the reason evaporates. Conversations, errands, and half-written messages lose their thread the moment something else touches your attention.
The reply sent before it was finished, the sentence you interrupted, the thing you agreed to before thinking it through. The brakes engage a beat late.
Some days everything clicks and you do a week of work in a sitting. Other days the same task will not start. The swing itself is the pattern.
Time slips in both directions: an hour vanishes inside something interesting, and ten minutes feels like plenty for a task that needs sixty. Deadlines arrive by surprise.
Restless legs through long meetings, a dozen started tasks held open at once, careful systems built to catch what attention drops. Keeping it all running is quietly tiring.
Everyone lives some of these sometimes; a bad month of sleep produces most of them. The pattern that matters is lifelong, shows up across several of them at once, and is persistent enough that you plan around it. That pattern is what a structured screening is built to look at.
There is no bright line where ordinary distractibility ends and ADHD begins. The abilities involved, holding focus over time, resisting distraction, stopping an action already in motion, keeping your responses steady, vary across everyone, and each of us sits somewhere on each scale. A screening measures where you sit: how far your results fall from typical adult ranges, and whether the low points cluster on attention measures specifically.
An illustration, not a real result. Attention measures sitting below the typical range while the abilities around them sit inside it is the kind of pattern worth bringing to a professional. Low results everywhere, or nowhere, tell a different story.
The screening is 9 short tasks, about 50 minutes in total, split into 2 sessions you can spread across days. Four tasks target attention directly: holding focus on a long, deliberately monotonous stream of letters, withholding a response that has become automatic, cancelling an action already in motion, and picking out a target while distractors pull the other way. The other five measure the abilities around them, like working memory, interference control, flexible sequencing, and processing speed, so a low attention score can be read in context rather than alone. Every task is built from a published research paradigm and scored against published adult norms. You can stop after any task and pick up later; finished tasks are skipped when you return.
At the end you can request a written report that walks through your pattern in plain language, grounded in 1,300+ peer-reviewed papers and population norms. Read a sample report →
Both are free and run in your browser. One is a taste, the other is the measurement.
A quick number game: pick the larger number, as many times as you can, in 30 seconds. It does not measure attention, it is just the fastest way to feel how this platform works: one real timed task, with an honest round reference at the end.
Play the challengeNine short tasks that measure sustained focus, impulse control, response consistency, and processing speed, plus the abilities around them, scored against published adult norms. They build into a profile of where you sit, and a report you can bring to a professional.
Start the ADHD ScreeningYour first task runs before you create anything, and its result is saved on your device. After that, a free account keeps your results in one place, lets the screening build into a profile across sessions and devices, and is where your report comes from.