SERPTool · Docs

Keyword gap analysis vs a competitor

Gap analysis answers: which keywords is my competitor ranking for that I'm not? It's one of the highest-value plays in SEO because the keywords are pre-validated — someone in your space is already ranking, so the opportunity is real.

When to run a gap analysis

  • Launching a content site — steal your 3 closest competitors' rankings as a 6-month content plan.
  • Mid-stage content refresh — identify gaps in your existing coverage.
  • Quarterly strategy review — spot where competitors are gaining ground you ignored.

Step 1: Pick the right competitors

Not every competitor is gap-worthy. Choose based on:

  1. Same audience, same scale or smaller — a DS-90 competitor's keywords are mostly unreachable for you. A DS-40 competitor ranking for something you could rank for is directly actionable.
  2. Similar content format — picking a YouTube channel as a competitor for your text blog doesn't help. Match format to format.
  3. Different content focus from yours — if you're 100% overlapping already, there are no gaps. Pick competitors who've gone broader or deeper than you have.

Aim for 2–3 competitor domains for the first round.

Step 2: Run COMPETITOR mode

Open New analysis → select COMPETITOR mode. Enter your domain and your competitor's. Set a cap (500–1,000 keywords is reasonable for a first pass). SERPTool returns keywords your competitor ranks for that you don't.

Credit cost: 10 setup + 1 per returned keyword. A 1,000-keyword gap analysis is 1,010 credits.

Step 3: Filter the noise

Raw competitor rankings include a lot of keywords that aren't real opportunities:

  • Brand keywords — your competitor ranks #1 for their own brand. You can't and don't want to. Filter on keyword text containing their brand name.
  • Off-topic rankings — competitor has a tangential blog post that's nowhere near their core offer. Skip.
  • Super-low volume — anything under 50 monthly searches is long-tail noise; address at scale, not individually.
  • Super-high KD — if the competitor ranks via strong authority and you can't match, the keyword isn't actionable today.

After filtering, your list is usually 20–40% of the raw output. That's your real gap.

Step 4: Cluster the gap

Group the filtered keywords into topical clusters. Two approaches:

  • Manual: skim the list, group by theme. Quick for under 100 keywords.
  • Formulaic: sort by head term (first word of each keyword) — natural clusters emerge.

Aim for 5–10 clusters. Each cluster is a candidate pillar + spoke page set.

Step 5: Score each cluster

For each cluster, sum or average the key metrics:

  • Total potential volume — sum of search volumes in the cluster.
  • Average Opportunity Score — how rankable on average.
  • Revenue proxy — average CPC × total volume (rough indicator of commercial value).

Rank clusters by avg_opportunity × total_volume. That's your priority order.

Step 6: Build the content calendar

For each high-priority cluster:

  • Pillar page — one comprehensive article targeting the highest-volume keyword in the cluster.
  • 3–5 spoke pages — smaller articles targeting specific long-tail queries within the cluster, linked back to the pillar.

One cluster per month is a reasonable cadence for a solo operator. Larger teams can parallelise.

Tactical notes

  • Don't copy, strengthen. The gap is that your competitor wrote something. Your job is to write better — more comprehensive, more current, more specific. If you can't genuinely improve on their page, skip it.
  • Compare weakness profiles. A gap keyword where your competitor ranks #1 on a DS-80 site and has THIN_CONTENT flagged is a write-a-deeper-article opportunity. A gap where your competitor ranks #1 with a DS-20 site is even better — the SERP is clearly winnable.
  • Re-run quarterly. Competitor rankings shift. New gaps open (your competitor drops a keyword); old gaps close (you now rank). A quarterly gap run keeps your content pipeline fresh.

A worked example

You run a SaaS blog, DS=25. Competitor is a similar SaaS blog, DS=40. Gap analysis returns 800 keywords. After filtering brand / off-topic / low-volume, you have 220 real opportunities across ~12 topical clusters. The top 3 clusters by avg_opportunity × total_volume:

  1. "Integration guides" — 40 keywords, avg opp 68, total volume 32k
  2. "Feature comparisons" — 25 keywords, avg opp 75, total volume 18k
  3. "Migration guides" — 18 keywords, avg opp 81, total volume 12k

You plan 3 pillars + 15 spokes over the next quarter. That's your roadmap.

Next steps