Do faces blur together for you?
The 20-item Prosopagnosia Index (PI20) is a validated self-report screening for developmental prosopagnosia, difficulty recognizing faces. Published by Shah et al. (2015, Royal Society Open Science) and used in research worldwide. Takes about 5 minutes.
Your result is free. At the end, a detailed report ($4.99) is offered as an option: you do not have to buy it.
🔒 No sign-up. Your answers are not sold or shared.
🔬 Face Blindness Test (PI20)
What is Prosopagnosia?
Prosopagnosia, often called face blindness, is difficulty recognizing faces, even those of people you know well or have met many times. It exists on a spectrum: some people struggle only with unfamiliar faces in passing, while others cannot reliably recognize close family members without other cues like voice, hairstyle or context.
Why it matters
Developmental prosopagnosia is more common than most people realize, estimated to affect around 2 percent of the population, and it is frequently mistaken for social disinterest, rudeness or poor memory. Many people live for years without a name for the pattern, quietly developing workarounds like relying on voice, clothing or context to identify people.
About this test
The PI20 is a validated 20-item self-report screening tool published by Shah and colleagues (2015) and used in research worldwide. A high score suggests your face recognition may be weaker than average; it is not a diagnosis, and a formal assessment requires objective face-processing tests administered by a specialist.