Keywords Everywhere is a freemium chrome extension that shows you monthly search volume, CPC & competition data on 15+ websites.
Free users: Keywords Everywhere shows you "related" keywords as well as "people also search for" keywords in widgets on the right hand side of Google & Bing. They also see the YouTube search insights widget, as well as the YouTube Tags widget.
Paid users: To see monthly search volume, cpc & competition data, users need to purchase credits. 15+ websites that are supported are list on the homepage at https://keywordseverywhere.com
For a complete change-log for this extension please visit https://keywordseverywhere.com/changelog.html