SEO Monitoring is a easy to use app grabs the Google PageRank and Alexa rankings for your sites every day, you can based on historical data and charts to monitor website SEO Trends. It's free.

App name SEO Monitor for Android Version 1.0.0 (2015-05-22)
Platform Android 2.3.3 or late File size 3.3 MB
Download SEO Monitor from Google Play

SEO Monitor Android App's screenshot
SEO Monitor Android App's screenshot
SEO Monitor Android App's screenshot
SEO Monitor Android App's screenshot