- Competitor keyword research finds the exact search terms your local rivals already rank for — so you stop guessing which blog topics will actually bring in customers.
- You don’t need a $139-a-month Semrush plan to do this — Google’s own search operators and free-tier tools cover 80% of what most local businesses need.
- The goal isn’t copying every keyword a competitor has — it’s finding the 10 to 15 terms with real buyer intent where their page is beatable.
- A gap only matters if you can out-write the page currently ranking for it — a thin, outdated competitor post is a far better target than a well-built one.
- Re-check your top three local competitors every 60 to 90 days — rankings move every time one of them publishes something new.
A Semrush subscription with real Keyword Gap access runs $139.95 a month before you’ve written a single sentence of content[2]. Ahrefs charges a “Starter” customer $29 a month for a plan that burns through its research credits in one afternoon of digging through a competitor’s site. Most local business owners hear “competitor keyword research” and assume it requires one of those bills, so they skip it entirely and keep guessing at blog topics instead. You don’t need either tool to find the twenty keywords a competing dentist, roofer, or gym in your city is quietly ranking for — you need about twenty minutes and a few free search tricks most people never bother learning.
What Competitor Keyword Research Actually Tells You
Competitor keyword research tells you which search terms are already proven to bring customers in your market — because a rival is sitting on page one for them right now. It skips the guessing stage of content planning entirely and replaces it with evidence pulled straight from the search results.
Most small businesses write blog content from the inside out — they pick topics based on what they think customers want to know. Competitor research flips that. Instead of asking “what should we write about,” you’re asking “what is already working for the three businesses fighting us for the same customer.” If a competing orthodontist’s blog post about “Invisalign cost without insurance” sits in the top three results and gets shared constantly, that’s not a guess anymore — it’s a term real people in your area are typing into Google. Your job is deciding whether you can write a page that answers it better.
How to Find the Three Rivals Worth Studying First
Not every business that shows up in a Google search is worth studying. A national directory site or a Yelp listing ranking above you isn’t a content competitor — it’s just noise. The businesses worth your time share a few traits:
- They rank above you for the one or two keywords that drive the most calls to your business.
- They serve the same city or service radius, not a national audience.
- They actually publish blog content on a schedule, not just a static “About Us” page.
- If a lead found both of you at the same time, there’s a real chance you’d lose the job to them.
Three competitors is the right number to start with. Pulling data from five or six just adds noise and repetition — the same ten keywords tend to show up across every rival in a niche, and a fourth or fifth competitor rarely surfaces anything new.
Three Free Ways to See What Competitors Rank For
None of these require a credit card, and together they cover most of what a paid gap-analysis tool shows you anyway.
- Google’s
site:search operator. Typesite:competitordomain.complus a topic word (like “cost” or “how long”) to see every page they’ve built around that angle, without opening their blog menu one post at a time. - “People also ask” and “Related searches.” Search your competitor’s exact blog title in Google, then scroll to the bottom of the results. The related searches there are the long-tail versions Google already associates with that topic — often terms the competitor’s own post doesn’t even target well.
- Free-tier versions of real tools. Google Keyword Planner is free with any Ads account and shows volume by city or zip code[3], and Semrush’s own Keyword Gap tool allows 10 free lookups a day before it asks for a card[2] — enough to check three competitors without paying for anything.
If you want a deeper walkthrough of stacking free tools like this, we put together a full breakdown of free keyword research tools for small businesses that pairs well with this method.
Reading a Keyword Gap List Without a Paid Tool
The hardest part of competitor keyword research isn’t finding the list — it’s knowing which five keywords on it are worth your time. A raw list of forty terms a competitor ranks for is useless without a filter, and most business owners stall out right here.
Run each candidate keyword through three questions. Does it describe something a paying customer searches for, not just a curious browser — “emergency water heater repair cost” beats “how water heaters work” every time. Is the page currently ranking for it thin, old, or stuffed with generic filler — check the publish date and skim the first three paragraphs. And could you add something that page doesn’t have, whether that’s local pricing, a real client story, or a photo of your own team doing the work. A keyword where all three answers are “yes” is worth writing. A keyword where the top result is a 3,000-word guide from a national brand with backlinks from forty other sites is not a fight worth picking yet.
Turning Competitor Keywords Into Blog Topics That Convert
A gap list is just raw material until it turns into actual published pages. The businesses that benefit from this exercise are the ones that treat each surviving keyword as a one-article assignment, not a someday idea sitting in a spreadsheet. A Taipei BJJ gym we manage content for went from zero to over 1,100 monthly visitors by doing exactly this — pulling the keywords a bigger competing gym ranked for, then publishing a sharper, more specific article against each one on a daily schedule instead of letting the list gather dust.
The pattern holds across trades and professions. Title your article to match the exact phrasing you found, not a cleverer version of it — searchers type “cost,” “near me,” and “how long does it take” far more than they type anything a copywriter would prefer. Answer the question in the first 100 words, because that’s the part Google and AI search tools actually pull into a featured snippet, and add the one thing the competitor’s page is missing, whether that’s a real price range, a video, or a photo instead of a stock graphic.
How Often to Re-Run a Competitor Keyword Check
Sixty to ninety days is the right cadence for most local businesses — frequent enough to catch a competitor’s new blog push, not so often that you’re re-checking the same stagnant list. A competitor who publishes nothing for six months and then suddenly adds ten posts in a week is a signal worth noticing, usually because they hired someone or finally got serious. The cost comparison still favors blogging either way — a single Google Ads click in a competitive local market can run $20 to $60 depending on the industry, while a published article keeps earning free clicks for years once it ranks.
Frequently Asked Questions
Do I need Ahrefs or Semrush to do competitor keyword research?
No. Google’s site: search operator, the “People also ask” box, and the free tiers of Semrush and Google Keyword Planner cover most of what a paid plan shows for a local business with one or two competitors to track.
How many competitors should I analyze at once?
Three is enough. Local competitors tend to rank for overlapping keyword sets, so a fourth or fifth rival usually just repeats terms you’ve already found rather than surfacing new ones.
What’s the difference between competitor keywords and a keyword gap?
Competitor keywords are everything a rival ranks for. A keyword gap is the narrower list of terms they rank for that you currently don’t — that narrower list is the one actually worth acting on.
How often should I redo a competitor keyword check?
Every 60 to 90 days for most local businesses. Check sooner if a competitor visibly ramps up their publishing or you notice a sudden drop in your own rankings.
If pulling a competitor’s keyword list every quarter and turning each one into a published article sounds like more than you want to manage on top of running the business, that’s exactly what RankOnRepeat handles for a flat monthly fee — the research, the writing, and the publishing. See how the process works before deciding whether to do it yourself or hand it off.
Published by the RankOnRepeat editorial team · Last updated: October 16, 2026 · How RankOnRepeat works
References
- Ahrefs Academy — how the Content Gap tool surfaces keywords competitors rank for that a given site doesn’t.
- Semrush Keyword Gap Tool — pricing tiers and free-search limits for comparing keyword profiles across domains.
- Google Ads Help: Use Keyword Planner — official documentation on filtering keyword volume by location using a free Google Ads account.
- BrightLocal — competitor analysis factors relevant to local search visibility.
