Research depth
Discovery
How well the tool supports keyword, competitor, SERP, backlink, or market research before execution.
SearchPilot
Its analysis is deep for experiments, but it does not provide broad keyword, competitor, SERP, backlink or market research before execution.
The platform provides advanced analysis, credible intervals, forecast diagnostics, readiness analysis, crawl analysis, and Search Console analysis: https://www.searchpilot.com/what-we-do
Textmetrics
Useful on-page SEO/content analysis, but no broad SEO research database is documented.
The Editor offers keyword ideas and analyzes keyword relevance for titles, headings and metadata, but the official feature description does not claim backlink, SERP, competitor or market research. https://textmetrics.com/seo-geo/