Serpstat

SEO platform for keywords, backlinks, rank tracking, audits

Keyword research, competitor analysis, daily rank tracking, backlink and site audits in one SEO platform, with API access and a 7-day free trial.

SpyFu

Competitor keyword and ad research for SEO and PPC

Research competitor keywords, ad copy, rankings, and backlinks. See estimated clicks and ad spend, track rankings, and compare domains side by side.