Google Analytics
Google Webmaster Tools + Bing Webmaster Tools
Open Site Explorer
Google Keyword Planner
Google Trends
SimilarWeb
Schema Creator
SEMRush
There are many tools to analyze your website SEO strength.
seoptimer.com
Google page speed
Google search console
Moz pro
SEMrush
SmallSEO tools
varvy.com
Woorank
iwebchk
Screaming Frog SEO
You can choose any of listed tools. SEMRush's paid SEO tool for checking your website works best for me.