Surfer SEO

Surfer SEO is the specialist in this list, and it does one job very well: helping content earn search visibility. Its Content Editor analyses the top-ranking pages for your keyword and gives a live score as you write, with guidance on terms to include, length and structure. It plugs into Google Docs, WordPress and other editors, so you can optimise without switching tabs, and higher tiers add content audits and AI drafting. For creators whose growth depends on organic search, that feedback loop can pay for itself. You still need something else to actually draft with, and the entry Discovery plan includes only a limited monthly allowance of Content Editor credits and AI articles, so it suits those publishing search-led content regularly rather than the occasional post.