Website SEO anaylysis and audit tool.
For the websites that I have checked, says that the information is too old to show. Then requires me to refresh. Then there is the button for a 7 day free trial and a paid subscription after that.
4 stars because it's not extension, but bookmark. Otherwise. Excellant analyzing tools gives advices and tips on improviing.
https://www.seoquake.com
https://www.similarweb.com
https://sitechecker.pro
Rahul Baruri
https://www.seoreviewtools.com
https://seoextension.info
https://www.spidernow.com
https://aioseo.com
https://pr-cy.io
https://mojha.com
https://semalt.com