There are several similar on page tools to POP. POP is the only tool that provides edge analysis to show you where you can get an edge on your competitors and rank better. POP doesn't use any correlation analysis, other tool's APIs, someone else's math, generic best practices, or page 1 "averages" for our recommendations.
The recommendations in POP are based of the extensive SEO tests that we regularly run on Google to determine what is or is not a ranking factor and which factors move the needle the most.
POP's proprietary algorithm coupled with machine learning technology provides enterprise level data (at not enterprise level prices) so that all SEOs regardless of skill or budget can compete for the keywords they want to win.