Keyword Gap Analysis Tool - Compare Lists Free

This keyword gap analysis tool compares your keyword list with a competitor's list and shows which keywords they have that you don't. Paste both lists, one keyword per line, and you get three results: missing keywords, your unique keywords and shared keywords. It is built for SEOs, bloggers and marketers who plan content.

What Is a Keyword Gap in SEO?

A keyword gap is a search term that a competitor targets or ranks for and your site does not. These gaps point to topics your audience searches for that your pages never address, so they are a practical starting point for new content.

This keyword gap analyzer measures the gap with a simple comparison. It cleans each list by trimming spaces, ignoring upper and lowercase, collapsing repeated spaces and removing duplicate lines. Then it sorts every keyword into one of three groups:

• Missing (gap): keywords on the competitor list that are not on yours.
• Your unique keywords: keywords on your list that the competitor does not have.
• Shared keywords: keywords that appear on both lists.

The idea is the same as a content gap analysis, but it works at the keyword level, so you can see the exact phrases you have not covered.

How to Use the Keyword Gap Analyzer

You need two keyword lists and about a minute. Follow these steps to compare them.

1. Export your own keywords from Google Search Console (the Performance report, Queries view) or from any rank tracker you already use.
2. Paste them into the Your Keywords box, one keyword per line.
3. Paste the competitor's keywords into the Competitor Keywords box, also one per line. The counter under each box shows how many unique keywords you entered compared with how many lines.
4. Click Analyze Gap. If either box is empty, you get a warning asking you to enter keywords in both fields.
5. Check the four summary figures: Your Keywords, Competitor Keywords, Missing (Gap) and Shared Keywords.
6. Switch between the Missing Keywords, Your Unique Keywords and Shared Keywords tabs, then press Copy All to copy a full list into a spreadsheet or content plan.
7. If you change either list, click Analyze Gap again to refresh the results. Clear empties both boxes so you can start over.

Worked Example: Comparing Two Running Shoe Keyword Lists

Suppose you run a running shoe blog and want to compare it with a competitor. Here are the two lists.

Your Keywords: running shoes, trail running shoes, best running shoes for flat feet.

Competitor Keywords: Running Shoes, marathon training plan, running shoes for flat feet, trail running shoes.

After cleaning, your list has 3 unique keywords and the competitor's has 4. The capital letters in "Running Shoes" are ignored, so it matches your "running shoes". The tool returns these results:

• Shared (2): running shoes, trail running shoes.
• Missing (2): marathon training plan, running shoes for flat feet.
• Your unique (1): best running shoes for flat feet.

The gap equals half of the competitor's list (2 of 4). "Marathon training plan" is a real gap: it is a new topic you could cover with a guide. "Running shoes for flat feet" is a near-duplicate of your "best running shoes for flat feet" page. The tool matches whole phrases exactly, so it lists that one as missing even though your page may already cover it. Check results like this before you commission new content.

How Do You Read and Act on the Results?

Each tab answers a different question, and each calls for a different next step.

Working through the missing keywords

The Missing tab is your to-do list, but not every line deserves a page. Start by sorting the keywords into groups by topic. Several missing phrases often belong on one page, such as "running shoes for flat feet" and "best shoes for flat feet runners".

Next, check what searchers want. The Keyword Intent Classifier sorts phrases into informational, commercial and transactional intent, so you know whether a guide, a comparison or a product page fits. Then measure how hard each term is to rank for with the Keyword Difficulty Checker. A common approach is to start with specific, lower-competition phrases that match your business, and save broad head terms for later.

Using your unique keywords

A long Unique list means you cover topics your competitor ignores. Keep those pages updated and link to them from related posts. If one of your unique topics gets steady impressions in Search Console, it may deserve a deeper guide.

Learning from the shared keywords

Shared keywords show where you and the competitor target the same searches. Having both lists is not the same as ranking equally. Open both pages and compare depth, freshness, examples and layout. Shared terms where your page is thinner are often the quickest upgrades.

Where Can You Get Keyword Lists for Comparison?

The tool works with any plain list, so the quality of your input decides the quality of the gap. For your own site, the Queries report in Google Search Console shows the searches that already bring impressions. A rank tracker export works as well.

For a competitor, you can use a keyword export from any SEO platform you already have access to. You can also build a list by hand from their page titles, headings and category names. To broaden either list, generate related phrases with the Keyword Suggestion tool and paste them in. Use one line per keyword, and remove extra columns such as volume or position before pasting, because the tool treats each whole line as a keyword.

Who Benefits from a Keyword Gap Analysis?

Anyone who plans content against competitors can use it. Common situations include:

• Content planning: turn the Missing tab into a quarterly editorial calendar.
• New site launches: compare a small starter list with an established competitor to see which core topics you lack.
• Ecommerce: find product types, materials or use cases that a rival category covers and yours doesn't.
• Agencies and freelancers: bring clients a clear, copyable list of missed topics.
• Site refreshes: spot where a competitor's coverage has grown since your last audit.

Best Practices, Common Mistakes and Troubleshooting

Small input choices change the results a lot, so use these checks before you trust the output.

Compare like with like

Use a competitor that targets the same audience and sells something similar. A large publisher with thousands of unrelated topics will produce a huge gap that is mostly irrelevant. Compare against the closest rival, then repeat with a second one.

Fix formatting problems

• Everything shows as missing: keywords were probably pasted as one comma-separated line. Put each keyword on its own line.
• The shared count is zero: check for extra characters, such as volume numbers or quotation marks, attached to the phrases.
• Counts look lower than expected: the tool removes duplicate lines, so the unique count can be lower than the entered count.
• The warning appears: one of the two boxes is empty. Both lists are required.

Watch for near-duplicates

Singular and plural forms, word order and added words count as different keywords. "Running shoe" and "running shoes" would both appear in different groups. Scan the Missing tab for variants of terms you already cover. If you have several pages on the same phrase, run the Keyword Cannibalization Checker before you add more.

Do not copy a competitor blindly

A gap shows what someone else targets, not what is right for you. Skip keywords that do not fit your products, audience or expertise, and look for angles your competitor missed. The LSI Keyword Generator can suggest related terms to round out each new page.

What Are the Limitations of This Comparison?

The tool compares text, not rankings or meaning. It does not check where either site ranks, how much traffic a keyword brings or how competitive it is, and it does not group synonyms. Two phrases that mean the same thing but are worded differently are treated as separate keywords.

It also only knows the keywords you paste in. If a competitor list is short or outdated, the gap will be too. Treat the result as a shortlist of ideas to verify, then add search volume, difficulty and intent from your other research. You can find more tools for those steps in the Keyword Research Tools category.

A keyword gap check takes minutes and gives you a ready list of topics to consider. Paste your keywords and a competitor's into the boxes above, click Analyze Gap, and copy the missing keywords into your next content plan.