Frase vs Semrush
Frase is a specialized content research and optimization tool. Semrush is a comprehensive SEO platform covering keywords, backlinks, audits, advertising, and content. They overlap on content optimization but differ massively in scope and price.
Verdict
These aren't really competitors — Semrush is an entire SEO platform while Frase is a content optimization tool. If you can only afford one, Semrush gives you more for the money despite costing 3.5x more. If you already have an SEO tool and just need content briefs, Frase fills that gap.