Your own data first: Search Console and GA4
Google Search Console is the source of truth for your own site: which queries show your pages, how often they get clicked, where they rank on average, and whether Google has indexed them at all. Search Console costs nothing and requires only that you verify site ownership at search.google.com. Every list we crawled for this guide, and the answer box above the results, puts it first.
Google Analytics 4 answers the next question: what visitors do after they arrive. Landing pages, engagement time, and whether organic visitors actually convert. Neither tool has a paid tier waiting behind it, which makes them the honest baseline to measure every subscription against.
Keyword research: the free-to-paid ladder
Keyword research tools tell you what people type and roughly how often. Free covers more than most beginners expect: Google Keyword Planner gives volume ranges, Google Trends shows seasonality and rising queries, and the search results page itself (autocomplete, People Also Ask, related searches) is a live keyword tool nobody bills you for.
Budget suites earn their keep on speed. Mangools wraps volume, difficulty scores and SERP data in an interface a first-year blogger can read, and AnswerThePublic turns one seed term into hundreds of real questions. The paid databases at Ahrefs and Semrush add scale: millions of keywords, clickstream-backed estimates, and competitor keyword gaps. Whichever rung you use, treat difficulty scores as estimates that differ tool to tool, not promises.
