Content Score is a numerical value that ranges from 0 to 100 and represents the quality and relevancy of the website's content in reference to a given keyword. Read the product update here.
The score consists of 100 factors including:
Usage of relevant words and phrases
Title and H1
Structure of the headers
Main keyword and partial keywords.
Content Score is available for all Surfer subscribers and is now a part of Content Editor and SERP Analyzer tools.
Here's Content Score evaluation inside Content Editor for a query – “keyword research 2020”:
Note: Content Score is currently in the beta version. It will get better with time and will be available in other features in Surfer toolset.