Ahrefs is a leading SEM tool for competitor analysis and website optimisation.
The software includes great features like:
Site Explorer: run a complete backlink competitor analysis, and shows you the organic keywords that a website ranks for in the organic keywords report.
Keywords Explorer: you can discover thousands of great keywords to rank for, analyze their ranking difficulty, and calculate their traffic potential.
Rank Tracker: includes interactive graphs that track your pages in the SERPs. Rank Tracker can quickly show you whether your SEO and content marketing efforts are working, or if they’re not.
Site Audit: allows you to analyze your website for technical SEO issues and monitor its health over time.
Alerts: sends you daily, weekly, monthly, or real-time notifications on new/lost backlinks, web mentions, and keyword rankings.