Research depth
Discovery
How well the tool supports keyword, competitor, SERP, backlink, or market research before execution.
Screpy
Covers keyword research, SERP analysis, organic keywords, competitor ads, backlinks, referring domains, and Search Console, but depth and quotas vary by plan.
Feature directory lists Keyword Research, SERP Analysis, Organic Keywords, Competitor Ads, Backlink Checker, Referring Domains, and Search Console: https://screpy.com/features/
Seobility
Useful keyword, competitor, backlink, and ranking research, but not positioned as an exhaustive enterprise research database.
The Keyword Research page supports seed, URL/domain, competitor, intent, volume, and top-10 ranking-page analysis: https://www.seobility.net/en/seo-content-tools/