Self-tests
Two tests. Real instruments.
No email, no score kept.
Most "ADHD tests" online are lead magnets wearing a lab coat. Twenty invented questions, then a wall asking for your address before it will tell you anything. These are the published screeners, printed in full with their copyright lines, scored in your browser by the same thresholds a clinic uses. You get the number and the citation. We get nothing.
General
Adult ADHD test
6 questions · 2 minutes · ASRS v1.1 Part A
The six-question screener the World Health Organization built with Harvard and NYU. In validation it outperformed the full eighteen-question checklist, which is why clinics use this half of it.
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Combined
AuDHD test — ADHD + autistic traits
20 questions · 5 minutes · ASRS v1.1 Part A + RAADS-14 Screen
Both screeners in one pass, scored separately and shown side by side. No validated single test for AuDHD exists, so this does not pretend to be one. It shows you two results and where they disagree.
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What a screener can and cannot do
A screening questionnaire is a filter, not a verdict. It is tuned to catch nearly everyone who has the thing, and it accepts a pile of false positives as the price. That trade is deliberate: missing someone is expensive, and a second look is cheap.
So a high score means the question is worth asking properly. It does not mean you have anything. A diagnosis needs a clinician, developmental history, evidence from more than one setting, and the elimination of the several conditions that look identical on a questionnaire. Sleep deprivation and anxiety catch people out most.
The reverse is also true. A low score on a six-question instrument does not close the file, particularly for the inattentive presentation the ADHD screener is weakest at catching.