Rankfill

Long Tail Keywords Finder: Find Gaps Competitors Own

You published a piece targeting "project management software." Six months later, it ranks on page four. Meanwhile, a competitor you've never heard of is pulling traffic for "project management software for remote construction teams" — and they wrote half as many words as you did.

That's the long tail working against you instead of for you. The fix isn't writing more content randomly. It's finding the specific phrases competitors already rank for that you don't — and building deliberately to close those gaps.

Here's how to do it.

What You're Actually Looking For

Long tail keywords are usually three to five words, lower in monthly search volume, and easier to rank for than head terms. But the more important property is intent specificity. Someone searching "CRM" is browsing. Someone searching "CRM for independent insurance agents under 50 employees" is ready to act.

What are long tail keywords and how they work matters less here than how to systematically find the ones your competitors are already capturing — because those represent proven demand with a content gap you can fill.

Step 1: Build Your Competitor List First

Before touching any tool, you need the right competitors. Your SEO competitors are not always your business competitors. They're whoever ranks on page one for your category's head terms.

Go to Google. Search three or four short phrases that describe what you do. Note every domain that appears consistently. Don't limit it to direct business rivals — content sites, comparison pages, and niche blogs all count if they're capturing search traffic you want.

Aim for five to eight domains. More than that and your analysis gets noisy.

Step 2: Pull Their Keyword Footprint

Now you want to see what those domains actually rank for. Every major keyword tool does this — Ahrefs, Semrush, Moz, and Ubersuggest all have a "Top Pages" or "Organic Keywords" report where you enter a competitor's domain and see the queries driving their traffic.

Export this data. You want the keyword, the URL ranking for it, the estimated monthly volume, and the keyword difficulty score. For a single competitor, you might pull thousands of rows.

Filter it down:

What you have now is a map of proven demand in your space.

Step 3: Run the Gap Analysis

The keyword gap is where the real work happens. You're looking for keywords competitors rank for that your domain does not appear for at all.

In Ahrefs or Semrush, there's a built-in "Content Gap" or "Keyword Gap" tool where you enter your domain and up to four competitors. The tool surfaces keywords one or more of them rank for that your site doesn't. This is the fastest version.

If you're doing it manually, export your own ranking keywords, export competitors' ranking keywords, and use a spreadsheet VLOOKUP or a tool like Google Sheets' FILTER to find rows in the competitor list that don't appear in yours. It's slower but works with free tools.

Either way, the output is a list of gaps. Now you need to prioritize them.

Step 4: Prioritize the Right Gaps

Not every gap is worth filling. Use these filters to decide what to build first:

Business relevance. Does ranking for this phrase actually bring someone who might buy from you, hire you, or subscribe? A software company doesn't need to rank for "what is software" — they need to rank for queries with specific purchase or evaluation intent.

Keyword difficulty under 40. Harder than that and you'll need significant domain authority and link equity to break in. For low-hanging fruit keywords, focus on difficulty scores where you have a realistic chance of ranking within three to six months.

Multiple competitors already ranking. If three of your five competitors rank for the same phrase, that's strong validation. It's a real query with real intent, and there's clearly room to compete.

Thin or weak content on the SERP. Open the top-ranking results. If they're forum threads, shallow listicles, or pages clearly not optimized for the query, the barrier is lower than the difficulty score suggests.

Sort your gap list by these filters and you'll have a prioritized content queue — not a random list of topics, but a ranked set of proven opportunities.

Step 5: Expand With Autocomplete and "People Also Ask"

Competitor gap analysis shows you what already has traction. Autocomplete shows you what's emerging.

Search your priority keywords on Google and note every autocomplete suggestion. Switch to Bing — its autocomplete surfaces different variations. Try Google's "People Also Ask" boxes, which are a direct window into related queries Google has confirmed get searched.

Tools like AnswerThePublic and AlsoAsked aggregate these into visual maps. They're useful for finding niche keywords your competitors might be missing — the specific variations that have volume but haven't attracted enough content to be competitive yet.

Add these to your list as secondary targets. They often make excellent H2 headers or supporting sections within a primary piece.

Step 6: Validate Volume Before You Build

Keyword tools give estimates, not exact numbers. Before writing a full article for a phrase, cross-check it.

Google Search Console (if you already have content) will show you actual impression data for queries your site has appeared for. Google Ads Keyword Planner shows historical search volume ranges — free to use without running ads.

If a phrase shows zero impressions in Search Console but meaningful volume in a third-party tool, treat the estimated volume skeptically. If multiple tools agree on volume, it's more reliable.

For long tail terms, 100–500 monthly searches is genuinely good. At that specificity, conversion rates tend to be much higher than broad terms. Don't dismiss a keyword because the number looks small.

What to Build Once You Have the List

The content format should follow search intent. A long tail question ("how do I X for Y situation") usually wants a guide or tutorial. A long tail comparison ("X vs Y for Z use case") wants a comparison page. A long tail product query wants a landing page or category page, not a blog post.

Match the format to what already ranks. If the top three results are all listicles, that's a signal. If they're detailed technical guides, your content needs to go at least as deep — long form content earns on depth, not length for its own sake.

Build one piece per gap target, optimized specifically for that phrase. Don't try to cover ten long tail variations in one article hoping to rank for all of them. It rarely works that way.

Tools That Help

Most of the process above works with free or low-cost options:

If you're looking for a service that maps competitor keyword gaps for you and delivers a prioritized content plan, Rankfill does exactly that — identifying every keyword opportunity competitors are capturing that your site is missing, with traffic estimates and a built-out content plan.

For a systematic approach to capturing long tail search traffic at scale, the gap analysis method here is the foundation regardless of which tools you use.

FAQ

What's the fastest way to find long tail keywords for free? Go to Google Autocomplete for your main topic and write down every suggestion. Then open the top-ranking competitor pages and run them through Google's free Keyword Planner to see what phrases they're associated with. It's slower than paid tools, but it works.

How do I know if a long tail keyword is worth targeting? Three signals: a competitor you respect already ranks for it, the keyword difficulty is below 40, and the search intent matches something your site can convert. If all three apply, build the content.

Why do my competitors outrank me on long tail terms when I have more content? Usually because their content is more specifically matched to the query. A page titled and written for the exact phrase will beat a longer, more general page almost every time for specific searches.

How many long tail keywords should I target per article? One primary target phrase, two to four closely related variations as secondary targets within the same piece. Don't try to rank one page for ten unrelated long tails — it dilutes relevance.

Can I do keyword gap analysis without a paid tool? Yes. Export your ranking keywords from Google Search Console. Ask a competitor's domain through Ubersuggest (limited free lookups) or manually search their top pages and note what phrases they're clearly targeting based on page titles and headers. It's more manual, but the logic is the same.

How long before a long tail article ranks? For a site with existing domain authority targeting a keyword under difficulty 40, typically two to four months. For newer sites or harder keywords, longer. Set expectations accordingly and build a queue rather than waiting on single pieces.