Open Site Explorer

3   ~ SEO backlink checker posted 18 Jan 2013 by skintor  

One of the top backlink research tools; fast and effective, now owned by Moz.

Like most, this site relies on the freemium model. You get a small amount of queries for free, however.

Includes measures of page and domain authority, and the paid version includes data on social metrics like Facebook likes

Free data available: Yes

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