Competitor analysis in SEO is not a one-time report an agency hands over in month one. It is an ongoing process of figuring out exactly what is working for the sites already winning the rankings you want, so the strategy is built on evidence instead of guesswork. Here is how that process actually runs.
Identifying the Right Competitors to Analyze
The first step is often overlooked: your direct business competitors are frequently not your direct search competitors. A regional accounting firm might compete for clients against three other local firms, but in the search results for “how to choose a tax preparer,” it is competing against TurboTax, NerdWallet, and a dozen finance media sites. Agencies build the competitor list by pulling the actual top-ranking domains for the client’s priority keyword set, not by asking the client who their competitors are. Both lists matter for different reasons, but the SERP-derived list is what the content and link strategy actually needs to beat.
Mapping Keyword Overlap and Gaps
With the real search competitor set identified, agencies run a keyword gap analysis using Ahrefs’ Content Gap tool or Semrush’s Keyword Gap tool. Both work the same way at a basic level: enter your domain plus up to several competitor domains, and the tool surfaces every keyword a competitor ranks for that you do not. Semrush’s version goes further and shows the overlap between organic and paid keyword gaps in one view, which is useful for agencies managing combined SEO and paid search accounts. The output is not a list to chase wholesale, it gets prioritized by relevance to the client’s actual offerings and realistic ranking difficulty, the same qualification process described in our keyword research guide.
Analyzing Competitor Backlink Profiles
Backlink analysis answers a different question than keyword gap analysis: not what topics to cover, but who is willing to link to content like this. Agencies pull a competitor’s referring domains in Ahrefs or Semrush and segment them by type (editorial mentions, resource page listings, guest posts, directory links, partner/sponsor links) and by authority. The goal is identifying replicable patterns, sites that have linked to multiple competitors in the space are strong outreach targets, since they have demonstrated willingness to link to this category of content more than once. The acquisition tactics that come out of this analysis are covered in our link building guide.
Auditing Competitor Content Structure
Beyond keywords, agencies look at how competitors structure their top-performing pages: heading hierarchy, use of tables and comparison charts, presence of original data or expert quotes, FAQ sections, and word count relative to topic complexity (not as a target to hit, but as a baseline to understand). This audit also flags what competitors are missing, outdated statistics, no comparison table, thin FAQ coverage, which becomes the basis for a genuinely differentiated page rather than a rewrite of the same structure.
A practical content audit checklist agencies run against each top-ranking competitor page includes:
- Heading structure. Whether it maps cleanly to the questions searchers actually have.
- Comparison tables or data visualizations. Presence and quality of either.
- Sourcing. Whether claims are backed by cited sources or original data versus generic assertion.
- FAQ coverage. Depth and specificity of any FAQ section.
- Freshness. How recently the page was visibly updated (a “last updated” date, refreshed statistics, current-year references).
Pages that score well across most of these tend to be harder to outrank quickly; pages that are thin on two or three of them represent a clearer, faster opportunity.
Assessing Competitor Technical Performance
Technical competitive analysis covers Core Web Vitals scores, mobile usability, site architecture depth, and crawl efficiency, run through tools like Google’s PageSpeed Insights, Screaming Frog, or the technical audit modules inside Ahrefs and Semrush. One area worth checking specifically: how a competitor’s rankings differ between desktop and mobile. Semrush’s research on mobile versus desktop SERPs found that only 17% of websites hold the same ranking position across both device types, meaning a competitor that looks dominant on a desktop-only rank check may actually be vulnerable on mobile, where most commercial searches now happen. That gap is frequently an opportunity the client can exploit if their own mobile experience is stronger.
Competitor analysis loses most of its value if it happens once at the start of an engagement and never again. Agencies typically run a lighter competitive check monthly (ranking movement, new content published, visible backlink gains) and a deeper full re-analysis quarterly, refreshing the keyword gap, backlink gap, and content audit against the current top performers, since the competitive set itself shifts as weaker sites drop out and new entrants invest in SEO. This cadence is what catches a competitor’s content refresh or sudden link campaign early enough to respond, rather than discovering it months later when the client asks why a previously stable ranking dropped.
Tracking Competitor Ranking Volatility and Building a Repeatable Cadence
Static snapshots miss the more useful signal: movement. Agencies set up rank tracking on the competitor set, not just the client, so they can see when a competitor gains or loses positions and investigate why (a content refresh, a new backlink batch, a site migration, an algorithm update hitting their site type harder). Sustained competitor volatility around a specific page often points to a vulnerability worth targeting directly.
The final step pulls everything together: for each priority keyword, what combination of content depth, backlink profile, technical performance, and page structure is the top-ranking competitor using, and which of those elements is realistically replicable or beatable within the client’s budget and timeline. This is where competitor analysis becomes strategy rather than a data dump. A competitor ranking #1 on the strength of a decade of accumulated domain authority is a different problem than one ranking #1 on a thinner, more recently built content asset that a sharper, more current page could overtake faster.
Reverse Engineering What’s Working, and Finding New Opportunity Keywords
Competitor analysis regularly surfaces keywords the client was not targeting at all. When the same gap keyword shows up across multiple competitors’ top-performing content but is absent from the client’s keyword map, that is a strong signal the topic deserves a dedicated page. Agencies validate these opportunity keywords the same way as any other target: checking real search volume in Ahrefs or Semrush, confirming the intent matches something the client can actually serve, and weighing the realistic difficulty against the client’s current domain strength before committing a content slot to it.
A few mistakes recur often enough to call out directly. The first is analyzing too many competitors at once, six or seven domains of varying relevance produces noise rather than a clear priority list, most agencies focus deep analysis on the three to five sites that consistently rank for the client’s actual priority terms. The second is treating every competitor gap keyword as equally valuable, a keyword three competitors rank for but that drives almost no real traffic or has weak commercial intent is not automatically worth a content slot. The third is a one-time analysis that never gets revisited, which is why the tracking cadence above matters as much as the initial research itself.
Common Pitfalls, and How This Feeds the Broader Strategy
Competitor analysis is not a standalone deliverable, it is an input that shapes content priorities, link targets, and technical fixes across the rest of the program. How those pieces get sequenced into a working plan is covered in our strategies overview, and the full toolkit agencies use for this kind of research, beyond just Ahrefs and Semrush, is detailed in our SEO tools guide.
