While both Google PageRank and Majestic Citation Flow measure websites according to links (and the metrics can apply to particular pages) there are a couple key differences. For one, PageRank ranges between 0 an 10 while Citation Flow is between 0 an 100. Another difference is the type of scale. PageRank is exponential while Citation Flow is linear. That means it is exponentially more difficult to move a website from PageRank 4 to 5 than it is to move it from 2 to 3. On the other hand, it takes the same amount of effort to move a website’s Citation Flow from 40 to 50 that it takes to move it from 20 to 30.