The core free toolkit for any SEO campaign starts with Google Search Console for indexing data and search performance, Google Analytics 4 for traffic analysis, and Google Keyword Planner for basic search volume estimates. Bing Webmaster Tools duplicates much of GSC functionality for Microsoft search and sometimes surfaces insights Google doesn't show. Screaming Frog SEO Spider lets you crawl up to 500 URLs without a license, which handles small sites or spot-checking specific sections on larger properties. For backlink analysis, Ahrefs Webmaster Tools is free after you verify domain ownership and shows your inbound link profile plus basic site health metrics. Ubersuggest offers limited daily keyword lookups and competitor overview without payment. Google PageSpeed Insights and Lighthouse provide performance scoring and Core Web Vitals data directly from Google's infrastructure. Answer The Public and AlsoAsked scrape related questions for content ideation. Google Trends contextualizes search interest over time and by region, useful for seasonal keyword validation or comparing brand awareness across Canadian cities like Ottawa versus Calgary. SEO browser extensions like MozBar, SEOquake, and Detailed show on-page metrics while you browse competitor sites. The catch with free tools is usage caps, delayed data, and smaller index sizes compared to paid platforms. Screaming Frog only crawls 500 URLs, Ubersuggest limits daily searches, and free backlink databases miss a significant portion of the link graph that Ahrefs or Majestic premium subscriptions reveal. At Ottawa SEO we run the free stack for new client audits and content research, then layer in paid subscriptions when managing 500-plus domains where comprehensive crawl data and historical ranking trends justify the cost. For solo consultants or small businesses under 50 pages, the free suite handles 80 percent of tactical SEO without monthly fees.