Ahrefs

Moz

Moz is a search engine optimisation software company. Available at moz.com, it is known for its Domain Authority metric and offers tools for keyword research, link research, site audits and rank tracking. For marketers and website owners, Moz suits people who want to understand and improve how their websites perform in search results. Its tools help identify keywords to target, find technical problems on a site and measure progress over time. Link research is a core part of the product. Moz maintains its own index of links across the web, which users can explore to see who links to a site, compare competitors and find new link opportunities. Moz is also well known for education. It publishes free SEO resources, including the Beginner's Guide to SEO, blog articles and training, which many people use when they first learn about search optimisation. The platform therefore supports several related uses, from learning SEO basics to researching keywords and links and tracking search performance. Its official website is https://moz.com/.

Semrush

Semrush is an online marketing platform covering SEO, content, advertising and competitor research. Available at semrush.com, it brings together tools for keyword research, site audits, backlink analysis and position tracking. For marketers and businesses, Semrush suits teams that want several marketing research tools in one place. Users can research keywords, check rankings and audit websites for technical issues that may hold back search performance. Competitor research is a key strength. Semrush shows estimates of competitors' search keywords, advertising activity and traffic sources, helping businesses understand where rivals are gaining visibility. The platform also includes tools for content planning, local listings, social media and reporting, which makes it popular with agencies managing several clients. Semrush offers paid plans with limited free access. The platform therefore supports several related uses, from SEO and paid search research to content marketing and client reporting. Its official website is https://www.semrush.com/.