Serpstat

Serpstat is a search marketing platform covering keyword research for SEO and paid campaigns, competitor analysis, rank tracking on mobile and desktop, site audit, keyword clustering, a traffic checker and an API positioned on cost efficiency. Pricing is published by tier with an annual discount.

Keyword clustering is the feature that most repays attention, because it addresses the point where keyword research usually breaks down. A research tool will happily return several thousand terms, and the work of deciding which of them belong on the same page is what actually determines whether a site ranks or splits its own authority across near duplicate pages. Grouping by thematic similarity automates the judgement that most teams either skip or get wrong.

Positioning the API on cost rather than on capability is a deliberate and unusual choice. Agencies and in house teams building their own dashboards care about the per request price because they pull data continuously, and a platform that competes there is targeting a buyer who has already decided not to use the interface.

Rank tracking across mobile and desktop separately reflects that the two return materially different results, and a single blended position would hide which of them is losing ground.