Assessments

This is a directory, not a library It records what each instrument measures and whether you are allowed to use it. It does not hold item text, scoring keys or PDFs, and it never will: most instruments in current use are copyrighted, and several are commercially licensed.

Can I use a psychological test for free?

It depends entirely on the instrument. Some are public domain and free to use; most in current clinical use are copyrighted and many must be bought from a publisher. This directory records the access terms for each one. PsychologyOrbit describes instruments and does not host them, because copying a licensed instrument is infringement.

PsychologyOrbit assessment directory, 2 November 2026.

Big Five personality (IPIP 50-item) (IPIP-50)

Public domain

Fifty public-domain statements from the International Personality Item Pool measuring the Big Five personality factors (Goldberg, 1992).

Extraversion, Agreeableness, Conscientiousness, Emotional Stability, Intellect/Imagination · 50 items · 8 min

Depression Anxiety Stress Scales, 21-item version (DASS-21)

Public domain

Twenty-one statements measuring depression, anxiety and stress over the past week, with a three-subscale structure. Widely used in research and clinical assessment.

Depression, anxiety and stress · 21 items · 5 min

GAD-7 anxiety screener (GAD-7)

Public domain

The seven-question Generalized Anxiety Disorder scale, a widely used screening measure for how much anxiety symptoms have bothered you in the last two weeks.

Anxiety symptoms over the last two weeks · 7 items · 2 min

PCL-5 post-traumatic stress checklist (PCL-5)

Public domain

The 20-question PTSD Checklist for DSM-5, from the US Department of Veterans Affairs National Center for PTSD. It asks how much you have been bothered by post-traumatic stress symptoms in the past month, keeping your worst experience in mind.

Post-traumatic stress symptoms over the past month · 20 items · 6 min

PHQ-15 physical symptoms questionnaire (PHQ-15)

Public domain

Fifteen common physical symptoms, from headaches to trouble sleeping. Physical symptoms have many medical causes, so a raised score is a reason to see a doctor, not a psychological explanation.

How much common physical symptoms have bothered you over the last four weeks · 15 items · 3 min

PHQ-4 anxiety and depression check (PHQ-4)

Public domain

Four questions combining the two core anxiety items (GAD-2) and the two core depression items (PHQ-2). A very short first check that points to the fuller GAD-7 or PHQ-9 when either part is raised.

Core anxiety and depression symptoms over the last two weeks · 4 items · 1 min

PHQ-9 depression screener (PHQ-9)

Public domain

The nine-question Patient Health Questionnaire, the most widely used screening measure for how much depressive symptoms have bothered you in the last two weeks.

Depressive symptoms over the last two weeks · 9 items · 3 min