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Open Site Explorer (OSE) and Majestic have their own indexes, with different URLS in them. OSE currently has 77 billion URLS in it's index, and Majestic has 438 billion unique URLS in it's Fresh index. There is some overlap, but they are not identical datasets. Neither will have ALL the backlinks going to your site. If you look at Google Webmaster Tools or Google Analytics, you tend to see some additional URLs linking back to you in there. If you can afford to use both OSE and Majestic, then do that, otherwise pick one and try to work with that. Hope that helps, James

mtthompsons Thanks for the comment. I have had a look and this tool looks useful. Thanks.

Conner, From Moz's documentation on the Keyword analysis tool, it analyzes the distribution of page authority and domain authority of the top 20 results in Google for your query so it's not just looking at the first page results but basing it's score on the results on the first two pages. The keyword difficulty score is by no means perfect and int this particular search it may be starkly obvious which factors are more dominant in composing it.  I would see that as an opportunity to better understand what is required by your site to rank more highly for your query. What scores are possible? We break up keyword difficulty levels into a number of ranges: 76%-100% - Extremely Competitive: These are among the most challenging keywords to rank for. On-page optimization, massive link strength, and high domain authority are necessary to achieve top ranking positions. 51%-75% - Highly Competitive: Powerful sites with strong pages tend to dominate these results. Links in quantity and quality (at both the domain and page level) are required to earn top rankings. 26-50% - Moderately Competitive: Search results in this category require high authority domains with well-targeted pages OR lower authority sites with powerful individual pages to achieve top results. 0-25% - Non-Competitive: Keywords in this range tend to have less powerful sites/pages in the top results. Rankings are achievable by pages on low authority domains with good on-page optimization and light link metrics