Research depth
Discovery
How well the tool supports keyword, competitor, SERP, backlink, or market research before execution.
AnswerThePublic
Strong question and search-demand discovery with visual reports, niches, and historical comparison, but not a full SEO research suite.
The SEO page says it collates, tracks, and alerts on important Google questions and helps discover niche subjects and unexpected keywords. https://answerthepublic.com/for/seo
KeywordsPeopleUse
Deep question, query, SERP, and audience-intent research for content planning, but not a broad backlink or technical research suite.
KeywordsPeopleUse mines People Also Ask, autocomplete, related searches, Reddit, Quora, and other question sources for content research. https://keywordspeopleuse.com/