I have used neurowriter, surfer SEO, PageOptimizer Pro (POP), and contentpace. They are almost the same theory. Analyze the top 30 or 50 pages, and show you the common keywords, H2, and H3 titles, common questions, and common links. Neurowriter has AI writing and plagiarism checker, and hope contenpace has more functions in the future. The better part of contentpace is that it has a very organized structure of all these data in just one page, and most importantly, the report can be downloaded with just one click. Great tools, contentpace and neurowriter are my main on-page SEO tools for optimization.