Personalis combines world class expertise in the technology of genome sequencing and interpretation with an extensive track record of peer-reviewed publications and commercial success. The much anticipated application of genome interpretation to clinical medicine will require accuracy in variant detection and consistency in variant interpretation befitting regulatory approval.
23andMe's biggest competition is apathy towards genetic testing.
A true competitor for the industry needs compelling "why" for buyers. No one has it yet.
2 companies are close, Counsyl and Ancestry.com.
1. Counsyl delivers on medical grade DNA tests: (DNA screening for the important moments in life)
2. Ancestry .com knows ancestry and a family tree is a real market, and isn't afraid to own it (Genealogy, Family Trees & Family History Records at Ancestry.com)
For a compelling "why", check out Fitnessgenes - Better fitness through DNA research based training and nutrition:
Their claims:
Lose Fat
Gain Muscle
Can they deliver on this? Who know. Much more compelling though than 23andme's "We bring the world of genetics to you". Here's an article I wrote on Fitnessgenes vs 23andme: This New DNA Test Will Eat 23andme's Lunch - Hitchhiker