Here are some more tools from which you can compare the performance of your website to that of your competitor.
11. Website Grader
Website Grader is a free SEO service which measures the marketing effectiveness of your website and it also provides a basic feedback on the performance of your website and the areas it can improve.
12. Solo SEO – Check Your IndexRank
Soloseo – Check Your IndexRank tool helps you identify the index rank of your website and also the number of pages indexed by Google overall.
Quarkbase is a database of website which provides you more information about a website.
14. Majestic SEO
Majestic SEO is a tool which helps you spy on your competitors’ top backlinks as it offers you with lists of inbound links to your competitors.
15. SEO for Firefox
SEO for Firefox is a free Firefox extension that allows you to easily check what your competition is up by seeing the useful marketing data and SEO statistics.
16. SEO Digger
SEO Digger is a free tool through which you can find out the phrases your competitor ranks for.
17. Feed Compare
Feed Compare is a tool through which you can compare the number of subscribers with others.
AttentionMaker is a free online web service through which you can compare website traffic to a maximum of 5 websites simultaneously.
19. Touch Graph
TouchGraph is a spy tool through which you can spy on your competitor both regarding keywords and adwords.
20. SEO Moz Rank Tracker Tool
SEOmoz Rank Tracker Tool is a free tool which provides you ranking information with charts and graphs showing your progress for easy future comparisons.