Competitor keyword analysis is the process of identifying which keywords your competitors rank for in organic search — and using that intelligence to find keyword opportunities your own site is missing. Rather than building your keyword strategy from scratch, competitor analysis lets you reverse-engineer what is already working for sites competing for your audience. It is one of the fastest ways to identify high-value keyword gaps and build a content plan that targets proven demand. This guide shows you how to conduct a thorough competitor keyword analysis using free and paid tools.
Identify Your SEO Competitors
Your SEO competitors are not necessarily your business competitors — they are the websites that rank for the keywords you want to rank for. A local plumber's business competitor is another local plumber; their SEO competitor for "how to fix a leaking tap" might be a national DIY guide site.
To identify your SEO competitors:
Method 1: Manual search — search Google for your 5–10 most important target keywords and note which domains consistently appear on page one. The sites that appear most frequently across your target queries are your primary SEO competitors.
Method 2: Tool-based discovery — tools like Ahrefs, SEMrush, and Moz have "organic competitors" features that automatically identify domains with the most keyword overlap with your site. Entering your domain shows a ranked list of your closest organic competitors by keyword overlap percentage.
Build a list of 3–5 primary SEO competitors to analyse. Choose competitors that are genuinely competing for your target audience, not massive authority sites (Wikipedia, major news organisations) that are impossible to compete with directly.
Tools for Competitor Keyword Analysis
The most useful tools for competitor keyword research:
Ahrefs — the industry-standard tool for competitor keyword analysis. Site Explorer lets you enter any domain and see its estimated organic keywords, traffic, and top pages. The "Content Gap" feature shows keywords competitors rank for that your site does not. Ahrefs requires a paid subscription but offers a 7-day free trial.
SEMrush — similar functionality to Ahrefs. Its "Keyword Gap" tool allows comparing up to five domains simultaneously to identify shared and exclusive keyword rankings. SEMrush offers limited free searches per day.
Moz Pro — provides keyword gap analysis through its "True Competitor" and keyword research features. Moz offers a free 30-day trial.
Google Search Console — free, but only shows data for your own site. Use it to identify your current ranking keywords, then search those keywords manually to see who ranks above you.
Ubersuggest — Neil Patel's free tool provides limited competitor keyword data. Useful for initial research if paid tools are not available.
Google Keyword Planner — while primarily a paid ads tool, entering a competitor URL in the "Discover new keywords" section can surface keywords Google associates with that domain.
Finding Competitor Keywords
The core competitor keyword research process using Ahrefs or SEMrush:
Step 1: Enter competitor domain in Site Explorer / Domain Overview. This shows the competitor's estimated total organic keywords and traffic, their top pages by traffic, and their top ranking keywords.
Step 2: Review top pages by traffic. The "Top Pages" report shows which pages drive the most organic traffic for the competitor. These are the topics where they are strongest — and where you need content to compete. For each top page, note the primary keyword and approximate traffic.
Step 3: Export top keywords. Export the list of all ranking keywords (or a filtered subset: keywords ranking in positions 1–20, with search volume above a minimum threshold) for offline analysis. For a typical competitor site, this may be hundreds or thousands of keywords — filtering to the most valuable subset is essential.
Step 4: Repeat for 3–5 competitors. Analyse each competitor individually, then combine the lists to get a comprehensive picture of the keyword landscape your site needs to compete in.
Keyword Gap Analysis
Keyword gap analysis compares your keyword rankings against competitors to identify keywords where competitors rank but your site does not. This is the most actionable output of competitor keyword analysis — it directly identifies content creation opportunities.
In Ahrefs: use the "Content Gap" tool under Site Explorer. Enter your domain as the target and your competitors' domains as the "competitors" fields. The tool returns keywords where your competitors rank in the top 10 but your site does not rank at all (or ranks much lower).
In SEMrush: use the "Keyword Gap" tool. Enter your domain plus up to four competitors. Filter by "Missing" keywords (keywords where competitors rank but your site has no ranking) or "Weak" keywords (keywords where you rank lower than competitors).
The output of a keyword gap analysis is a list of topics you should create content for. These are proven keyword opportunities — competitors are already generating traffic from them, confirming there is search demand and that the keywords are winnable by sites in your niche.
Prioritising Opportunities
A competitor keyword gap analysis typically surfaces many more opportunities than you can act on immediately. Prioritise based on:
Search volume — higher-volume keywords deliver more traffic potential. However, high-volume keywords are typically more competitive.
Keyword difficulty — most keyword tools provide a difficulty score (0–100) estimating how hard it would be to rank in the top 10 for a given keyword. For new or lower-authority sites, target keywords with difficulty scores under 30–40 first.
Business relevance — keywords must be relevant to your product or service. High-volume, low-difficulty keywords that attract an audience unlikely to become customers are vanity traffic — not worth prioritising.
Commercial intent — keywords indicating purchase intent (e.g., "best SEO tools," "keyword checker free") typically convert at higher rates than purely informational queries. Prioritise a mix of commercial-intent keywords (direct revenue impact) and informational keywords (top-of-funnel audience building).
Number of competitors ranking — if all 5 competitors rank for a keyword but your site does not, it is a strong signal that the keyword is important in your niche and that you are missing a significant opportunity.
Turning Analysis Into Content Strategy
The output of competitor keyword analysis should directly feed your content calendar. For each high-priority keyword gap identified:
- Determine the search intent (informational, transactional, navigational) and the appropriate content type (blog post, landing page, product page, tool)
- Review the top 3 ranking competitor pages for that keyword — note their format, depth, structure, and what makes them rank
- Plan content that covers at least everything the competitor covers, plus any gaps or improvements you can make to create a more useful resource
- Use our keyword density checker to verify your published content uses the target keyword appropriately
- After publishing, build internal links to the new page from relevant existing content, and pursue external backlinks to compete with established competitors
Competitor keyword analysis is not a one-time exercise. Repeat it quarterly — competitors publish new content continuously, and new keyword opportunities emerge as your own site builds authority and ranking capacity for higher-difficulty terms.
Frequently Asked Questions
How do I find what keywords my competitors rank for?
Enter your competitor's domain into a keyword research tool like Ahrefs Site Explorer, SEMrush Domain Overview, or Moz's Link Explorer. These tools estimate the organic keywords a domain ranks for based on their crawl data and SERP tracking. For a free option, search your competitors' top topics manually on Google and note which queries they rank for, then use Google Keyword Planner to estimate search volumes.
What is a keyword gap?
A keyword gap is a keyword where your competitors rank (usually in the top 10) but your site does not rank at all or ranks much lower. Keyword gaps represent topics where competitors have content that you do not — direct opportunities to create new pages that could capture the same organic traffic your competitors are receiving.
How many competitors should I analyse?
Analyse 3–5 direct SEO competitors — sites competing for the same keywords and serving the same audience as your site. More than 5 produces diminishing returns for the effort involved. Choose competitors that are a realistic size comparison (similar domain authority, similar content volume) rather than industry-dominant sites that are not realistic ranking competitors for your site at its current stage.
Can I do competitor keyword analysis for free?
Fully free competitor keyword analysis is limited — the most capable tools require paid subscriptions. However, Ubersuggest offers limited free competitor keyword data. SEMrush and Ahrefs both offer limited free daily searches. For a manual free approach: search your target keywords on Google, note competitor page titles and topics, and use Google Keyword Planner to research related keywords and volumes.