Keyword Gap Analysis: Finding What Competitors Rank For

Keyword gap analysis is the process of comparing your site’s ranking keywords against 2-3 direct competitors to find terms they rank for that you don’t. You run it in a tool like Ahrefs Content Gap or Semrush Keyword Gap — enter your domain plus your competitors’, pull the list of “missing” and “weak” keywords, then filter by search volume, difficulty, and intent before you add anything to a content calendar. Done properly, a first pass takes 60-90 minutes and usually surfaces 20-50 keywords worth acting on.

The mistake most teams make isn’t running the comparison — it’s stopping there. A raw export from a gap tool can hand you 800 rows of “missing” keywords, and most of them are junk: irrelevant to your business, priced out of reach on difficulty, or ranking on the back of a domain that’s been live for a decade longer than yours. This guide walks through the full process, from picking competitors to publishing, based on our full keyword research process applied specifically to competitive comparison.

What do you need before running a keyword gap analysis?

Three things, minimum:

• Your own ranking keyword list. Pull this from Google Search Console (free) or a paid tool’s Organic Keywords report for your own domain — you need a baseline before you can find a gap.
• 2-3 real competitors, not aspirational ones. A competitor for gap analysis is a site that ranks for keywords your buyer searches, not a brand you admire. A 50,000-visit-a-month enterprise SaaS site is not a useful comparison for a 2,000-visit-a-month startup, even if you compete for the same customer.
• Access to a gap tool. Ahrefs Content Gap compares up to five domains at once. Semrush’s Keyword Gap tool adds a Venn diagram view and lets you filter by “Missing” (they rank, you don’t) and “Weak” (you both rank, but they outrank you). Both have paid tiers only for this specific report — there’s no meaningful free version of a true gap comparison, unlike single-keyword lookups.

Step 1: How do you choose which competitors to compare against?

Start from search results, not your sales team’s competitor list. Search your 10-15 most important keywords and note which domains show up in the top 10 repeatedly — three or more times across your list is a strong signal. Those are your real organic competitors, and they’re often different from the companies you compete against in sales calls.

Pick 2-3, not more. Ahrefs and Semrush will let you compare up to five domains at once, but every extra domain dilutes the list with noise — a keyword only three of your five comparison sites rank for is a weaker signal than one all three of your chosen competitors rank for. Two to three focused competitors gives you a cleaner, more actionable export than five loosely related ones.

Step 2: How do you run the actual keyword gap comparison?

Enter your domain as the primary site and your 2-3 competitors as the comparison set. In Semrush, filter the results view to “Missing” first — these are keywords all your competitors rank for and you don’t rank for at all. Then check “Weak” — keywords you rank for outside the top 10 while at least one competitor sits inside it. Ahrefs’ Content Gap report works the same way conceptually: it surfaces keywords the comparison domains rank for in positions 1-100 that your domain doesn’t rank for anywhere.

Export the raw list before you filter anything. A typical first export for a mid-sized site runs into the hundreds or low thousands of rows — that’s expected, and it’s the next step’s job to cut it down, not this one’s.

Step 3: How do you filter gaps down to real opportunities?

Run every keyword in the export through the same four checks:

A gap list of 800 keywords typically shrinks to 40-80 after this pass. That’s normal — the filtering is the actual analysis. The export is just raw material.

Step 4: How do you score and prioritize what’s left?

Score each surviving keyword on two axes: business value (does ranking for this actually move revenue, or just traffic?) and competitive gap size (how many of your 2-3 competitors rank for it, and how well). A keyword all three competitors rank in the top 5 for, that also matches a page you could realistically write this quarter, outranks a keyword only one competitor barely ranks for at position 47.

Group the survivors by which existing page could absorb them versus which need a new page entirely. This is the same clustering logic covered in keyword research generally — a gap keyword doesn’t automatically need its own URL just because a competitor has one.

How is gap analysis different from finding a competitor’s best keywords?

Gap analysis tells you what a competitor ranks for that you don’t — it’s a comparison exercise across two or more domains. It doesn’t tell you which of those keywords is actually sending them meaningful traffic versus which one ranks at position 60 for a term nobody searches. For that narrower, single-competitor question, see our guide to finding a competitor’s best-performing keywords — it’s the logical next step once a gap analysis has told you which competitor is worth studying closely.

Gap analysis also isn’t the same exercise as deciding whether to target a competitor’s branded search terms. That’s a separate, narrower decision covered in our guide on competitor brand keywords — bidding on or writing content around a rival’s actual company name comes with different risks than targeting a shared, non-branded keyword.

What mistakes should you avoid in keyword gap analysis?

• Comparing against domains with 10x your authority. A gap against an enterprise competitor will surface hundreds of keywords you have no realistic shot at in the next year. Include at least one competitor closer to your own size.
• Treating every “Missing” keyword as equal. A keyword all three competitors rank top-3 for is a far stronger signal than one only one competitor ranks for at position 80.
• Skipping the SERP check. A keyword tool’s intent label is a guess. Always look at the actual top 10 before committing — if it’s dominated by forums or video, a standard blog page won’t compete regardless of volume.
• Running this once and filing it away. Competitors publish new pages constantly. A quarterly re-run catches gaps that didn’t exist six months ago.
• Ignoring your own “Weak” list. Keywords you already rank for at position 11-20, where a competitor sits in the top 10, are often cheaper wins than brand-new keywords — you’re improving an existing page, not building one from zero.

FAQ

How many competitors should I include in a keyword gap analysis?

Two to three, chosen because they repeatedly appear in the top 10 for your own priority keywords. Comparing against more than four or five dilutes the export with noise and makes filtering slower without adding useful signal.

Do I need a paid tool to run a keyword gap analysis?

Practically, yes, for a true multi-domain comparison — Ahrefs Content Gap and Semrush Keyword Gap are both paid features. You can approximate a manual version using Google Search Console for your own keywords and manual SERP checks for competitors, but it’s slower and less complete.

How often should I re-run a keyword gap analysis?

Quarterly for most sites, monthly if you’re in a fast-moving category where competitors publish frequently. Rankings and competitor content both shift enough over three months to make a fresh pass worthwhile.

What’s a normal number of usable keywords from a gap analysis?

After filtering for relevance, volume, difficulty, and intent, expect 40-80 usable keywords from a raw export in the hundreds, and often fewer for a smaller site with a narrow niche. If your filtered list has 300+ survivors, your filters probably aren’t strict enough.

Should I prioritize gap keywords by volume or by competitor ranking strength?

Neither alone. Score both together — a keyword with modest volume that all your competitors rank top-5 for is usually a better bet than a high-volume keyword only one competitor barely ranks for, because the first is proven demand plus a validated content format.

Running this comparison manually every quarter takes real time, and most teams don’t stick to the schedule once the backlog piles up. Our SEO Growth plan includes competitor-driven keyword strategy as a standing part of the retainer, so gap analysis happens on a schedule instead of whenever someone remembers to run it.

Written by Palash, founder of PalV’s DM. 5+ years in SEO, 1,000+ articles published.