Google Search Console and Google Analytics are non-negotiable—they're free, straight from the source, and show you exactly what Google sees and how users behave. Beyond that, paid tools fill specific gaps: Ahrefs and Semrush dominate for backlink profiles, competitor analysis, and keyword research with massive indexes (Ahrefs claims 30+ trillion links). Screaming Frog is the go-to desktop crawler for technical audits—it finds broken links, duplicate content, and indexation issues across thousands of pages in minutes. For rank tracking, tools like AccuRanker or the tracking modules in Ahrefs and Semrush let you monitor keyword positions across cities (useful for Toronto vs. Ottawa local campaigns). Moz still has a loyal following for its Domain Authority metric, though we find Ahrefs' Domain Rating more predictive in practice. Smaller operations often start with Ubersuggest or Mangools for lighter keyword work at CAD $30–50/month instead of $150–300. Technical specialists lean on tools like Sitebulb for visual site audits, GTmetrix or PageSpeed Insights for Core Web Vitals, and Schema.org validators for structured data. Content teams use Clearscope or SurferSEO to optimize on-page factors against top-ranking pages, though those add another $100–200/month. At Ottawa SEO, our core stack is Google Search Console, Ahrefs for research and backlinks, and Screaming Frog for audits. We run 500+ domains, so automation and batch analysis matter—Ahrefs' API and Screaming Frog's command-line mode handle that. For new clients, we always pull GSC data first because it shows real impressions and clicks, not estimates. Most solo consultants can operate with GSC, Analytics, and one paid tool under $200/month. Agencies managing dozens of clients typically spend $500–1,500/month across tools, depending on team size and whether they white-label reporting dashboards. The right combination depends on whether you prioritize link building, content optimization, or technical fixes.