Google Keyword Planner remains the gold standard for search volume data because it comes directly from Google, though volumes are bucketed for non-spenders. It's free with a Google Ads account and gives you the actual advertiser data, making it reliable for commercial intent keywords. Pair it with Google Search Console for your existing site to see what you already rank for and where opportunity gaps exist. Ahrefs and SEMrush are the professional-grade options. Ahrefs excels at backlink data and keyword difficulty metrics, with plans starting around $99 USD/month. SEMrush offers broader competitive analysis and content tools, starting similarly but scaling to $449+ for agencies. Both provide keyword difficulty scores, SERP analysis, and content gap features. At Ottawa SEO, we use Ahrefs for most client work because the keyword difficulty algorithm correlates well with actual ranking effort in Canadian markets. Ubersuggest offers a middle ground at $29–$99 USD/month with decent volume estimates and keyword ideas, though data accuracy lags behind Ahrefs. It's solid for small businesses or solo consultants who can't justify $200+/month tools. The Chrome extension gives quick checks without opening the full platform. AnswerThePublic and AlsoAsked are free for visualizing question-based queries, useful for FAQ sections and content planning. KeywordTool.io scrapes Google autocomplete across different countries, helpful for Canadian vs. US term variations. The tool matters less than the process. Start with seed terms in Keyword Planner, expand with Ahrefs or SEMrush to find semantically related clusters, then validate commercial intent by checking if advertisers bid on those terms. Volume alone is misleading—a 500-search local keyword can convert better than a 5,000-search broad term. Check difficulty against your domain authority; if you're DR 15, don't chase keywords dominated by DR 70+ sites. Export data to spreadsheets and organize by topic clusters, not individual keywords, since Google's algorithm now groups related queries anyway.