Most SEO companies work from a fairly standard set of tools. The names vary from agency to agency, but the categories rarely do. Understanding what each category does helps you read an agency’s proposal and ask better questions about how they actually work.
The free Google core
Two free Google products sit at the center of nearly every SEO program. Google Search Console reports how a site performs in Google’s own search results, including impressions, clicks, average position, index coverage, and which pages have crawling or mobile usability problems. It is the closest thing to ground-truth data about how Google sees a site. Google Analytics 4 (GA4) measures what visitors do after they arrive: which pages they land on, how long they stay, and which actions they complete. An agency that does not connect both of these for your site early in an engagement is missing the basic measurement layer, so it is reasonable to expect them in any plan.
Rank tracking
Search Console reports average position, but most agencies also use a dedicated rank tracking tool to follow specific keywords day by day, segment results by location and device, and watch how rankings move against competitors. Rank tracking is sometimes a standalone product and sometimes a feature inside a larger suite. Either way, it gives a clearer picture of progress on the exact terms a business cares about than Search Console’s broad averages do.
All-in-one suites
For keyword research, backlink analysis, and competitor intelligence, most agencies rely on a comprehensive paid platform. Ahrefs and Semrush are the two best known. Both let an agency research keywords, study which pages and links are working for competitors, audit a site for technical issues, and track rankings within one interface. Moz offers a similar suite, and Majestic specializes in backlink data. These tools are subscription products, and the agency normally carries that cost as part of its overhead rather than billing you for separate licenses.
Crawlers for technical audits
To examine a site’s technical health, agencies use a crawler. Screaming Frog SEO Spider is the long-standing standard. It crawls a website much as a search engine would and surfaces broken links, redirect chains, duplicate or missing title tags and meta descriptions, thin pages, and other structural problems. The free version covers up to 500 URLs, and a paid license is used for larger sites. Sitebulb is another crawler in common use. The all-in-one suites above also include site audit features that overlap with this category.
Page speed and Core Web Vitals tools
Page experience is part of how Google evaluates a site, so agencies test it with tools built for that purpose. Google’s PageSpeed Insights combines a Lighthouse lab test with real-world data from the Chrome User Experience Report. Lighthouse is also available directly inside Chrome’s developer tools. The three Core Web Vitals these tools report are Largest Contentful Paint, which measures loading, Interaction to Next Paint, which measures responsiveness, and Cumulative Layout Shift, which measures visual stability. Search Console includes a Core Web Vitals report that groups affected pages across a whole site.
Reporting tools
Finally, agencies need a way to present results to clients. Some build dashboards inside Google’s free Looker Studio, pulling in data from Search Console, GA4, and other sources. Others use reporting platforms such as AgencyAnalytics or the built-in reporting modules in Ahrefs or Semrush. The goal is the same: turn raw data into a regular, readable summary of what changed and why.
What this means for you
A capable SEO company usually combines the free Google tools, at least one paid all-in-one suite, a crawler, page speed testing, and a reporting layer. No single tool does everything, and the specific brands matter less than whether the agency uses each category for the right job. When you review a proposal, it is fair to ask which tools the agency relies on and how each one informs the work, since that tells you how disciplined and transparent their process is likely to be.