How is Google PageRank different from Ahrefs URL Rank?

Google PageRank is an algorithm used by Google to rank webpages for their own organic search results. Ahrefs URL Rank is an exponential scale of 0 to 100 developed by Ahrefs to measure the impact of all backlinks which link to a given website URL. Where Ahrefs URL Rank will be calculated using back link factor, Google PageRank is an algorithm which considers multiple factors beside back links.