AncestryDNA | 16 million |
23andMe | 10 million |
MyHeritage | 2.4 million |
FamilyTreeDNA | 1 million |
LivingDNA | No data provided |
Below are the answers I received from the top 5 DNA testing companies about their database size. For more details and information, read this comparison: Ancestry.com vs 23andMe.
If you want to find out right now which is the best DNA test according to my research:
Which is the most accurate DNA test?
According to my ethnicity calculation (based on Principal Component Analysis), my family tree research, and database size investigation, currently (2022), the best DNA testing company is:
23andMe

AncestryDNA:
Its database size is published on its story page: https://www.ancestry.com/corporate/about-ancestry/company-facts

MyHeritage

FamilyTreeDNA

According to their instruction, this is their database site: https://familytreedna.com/why-ftdna

LivingDNA
It hasn’t provided any information about its database!
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I’ve always been interested in DNA testing and genealogy. My DNA testing research is approved by my teachers at the Boston University of Genealogy. I’ve been following DNA testing’s rise since its first appearance in 2006.