Semrush
All-in-one platform for search and competitor research
Semrush is a broad marketing platform whose SEO side covers keyword research, competitor domain analysis, position tracking, site auditing, back-link data and on-page recommendations. Its databases span many countries, which makes it a common choice for agencies working across markets.
A free account allows a small number of daily lookups and one project, enough to evaluate it before paying. Beyond SEO it includes advertising research, social tools and content templates, which some teams value and others ignore. The usual caution applies: keyword volumes and traffic estimates come from models, so use them to compare opportunities rather than to forecast revenue.