Research depth
Discovery
How well the tool supports keyword, competitor, SERP, backlink, or market research before execution.
KWHero
Strong research workflow with keyword ideas, SERP data, clustering, and topical maps.
The homepage says users can discover opportunities with keyword ideas, SERP data, and AI-powered Topic Clusters, and can analyze search volume, difficulty, and SERPs: https://kwhero.com/
Semji
Strong competitor and enterprise SEO intelligence, though not a general-purpose SEO crawler/research suite.
Intelligence Hub analyzes competitors, content gaps, SEO-provider data, and enterprise-scale page sets: https://semji.com/intelligence-hub/