You do not need a giant software stack. These free websites cover the essentials: visibility, performance, demand, technical markup, and a clear starting audit.
Five websites worth bookmarking
Google Search Console , see the searches, pages, clicks, indexing issues, and technical signals Google actually reports.
PageSpeed Insights , test mobile and desktop performance, then focus on the opportunities marked as high impact.
Google Trends , compare topics, spot seasonality, and understand how search interest changes by place and time.
Google Rich Results Test , check whether structured data on a page is eligible for enhanced search results.
Free SEO Grader , get a fast, plain English review of the core website fundamentals that deserve attention first.
NEXT STEP
Put it to work
Start with Search Console and your own conversion data. Tools are most useful when they help you make one specific decision, not when they produce another unread report.