SEOquake for Chrome, Firefox, Edge, and Opera gives free in-browser access to essential SEO metrics, along with other useful tools such as SEO Audit and many others.

SEOquake consists of several useful tools you can use depending on which specific SEO endeavors you require. The SEO bar is an additional toolbar located at the top of the browser window, and it presents core metrics – many of which can be customized. There is also, the SERP overlay is a bar that will appear below each SERP result. Once enabled, the SERP overlay gives you detailed metrics associated with each listing along with another sidebar section for sorting and exporting your results.
Also, you can get detailed reports for a specific page you are analyzing.

SEOquake also includes several other useful tools, including the SEO Audit tool, the Keyword Density report, Internal/External Link analysis, and even social metrics.

SEOquake includes the following SEO parameters: Google Index, Google Links, Google Cache date, Yahoo Index, SEMrush links, SEMrush backlinks by domain, SEMrush backlinks by hostname, Bing Index, Alexa Rank, Webarchive age, Facebook likes, SEMrush Rank, SEMrush SE Traffic, SEMrush SE Traffic price, Baidu index, Baidu link, and Compete Rank.

SEOquake allows you to:

Review all major metrics in a heartbeat

Get a thorough analysis of SERPs and export the results in CSV format

Estimate keyword difficulty instantly

Set parameters for a search query

Run a complete SEO audit of a webpage, including a check for mobile compatibility

Check your social statistics for Facebook and Google+

Use a wide range of default parameters or create a custom set

Get a full report for internal/external links

Determine a keyword’s density and configure a stop-word list

Compare URLs/domains

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