10 Best Keyword Research Tools for Agencies [2026]

Short answer: Semrush is the best keyword research tool for agencies that need maximum data and bulk analysis. SEO Runway is best for agencies that want research to flow straight into each client's rank tracker and content briefs without spreadsheets. Keyword Insights is the clustering specialist for content agencies. For the general comparison, see our keyword research tools guide.

Disclosure: SEO Runway is our product. We ranked it using the same criteria as every other tool, and noted where others do better.

Quick picks

• Deepest data and bulk analysis: Semrush
• Best research-to-delivery workflow: SEO Runway
• Best clustering: Keyword Insights
• Best content gap data: Ahrefs
• Best value: SE Ranking

Keyword research tools for agencies compared

*Approximate; verify.

How we chose these tools

We compared each tool's published features, plans and documentation on six agency criteria: bulk analysis limits, clustering, per-client lists, team sharing, export or handoff to briefs and tracking, and cost per 10,000 lookups.

1. Semrush: deepest data and bulk analysis

Verdict: the agency standard for large-scale keyword research and gap analysis.

Pros: data; bulk tools; strategy builder.

Cons: per-user cost for teams.

2. SEO Runway: best research-to-delivery workflow

Verdict: research inside each client project: volume, difficulty and intent, then send keywords straight to that client's tracker or a SERP-based content brief.

Pricing: Core SEO from $49/month; 14-day free trial. See plans.

Pros: no spreadsheets between tools; per-client separation; team roles.

Cons: less database depth and gap analysis than Semrush or Ahrefs.

3. Ahrefs: best content gap data

Verdict: superb Keywords Explorer and Content Gap.

Pros: quality data.

Cons: credit limits for heavy users.

4. SE Ranking: best value

Verdict: keyword research with clustering at a lower price.

Pros: value.

Cons: smaller database.

5. Keyword Insights: best clustering

Verdict: SERP-based clustering that turns thousands of keywords into page plans.

Pros: clustering; briefs.

Cons: needs keyword data from elsewhere.

6. Serpstat: best budget bulk

Verdict: bulk research and clustering cheaply.

Pros: price.

Cons: data depth by market.

7. Moz Pro: best for priority scoring

Verdict: keyword lists with priority scores.

Pros: prioritisation.

Cons: limits.

8. KWFinder: best for quick local lookups

Verdict: fast local keyword checks.

Pros: ease.

Cons: not built for bulk.

9. LowFruits: best for low-competition finds

Verdict: finds SERPs with weak results.

Pros: opportunity finding.

Cons: credits.

10. SpyFu: best for competitor keyword history

Verdict: years of competitor keyword history.

Pros: history.

Cons: US-focused.

An agency keyword workflow, from research to report

1. Seed: services, locations and competitors from the client brief.
2. Expand: pull related keywords and questions in bulk.
3. Cluster: group keywords that share a SERP into one page each.
4. Map: assign clusters to existing pages or new pages, and check for cannibalization.
5. Track: send priority keywords to the client's rank tracker.
6. Brief: create content briefs for new pages.
7. Report: show progress by cluster in the monthly report.

Related guides

• SEO software for agencies
• Content optimization tools

Frequently asked questions

What is keyword clustering, and do agencies need it?

Clustering groups keywords that Google answers with the same results, so one page can target the whole group. Agencies producing content at scale need it to avoid cannibalization and plan pages.

How many keyword lookups does an agency need a month?

It varies with clients and content volume, often several thousand to tens of thousands. Check limits and overage costs.

Can clients see keyword research?

Share the mapped plan (clusters and target pages), not the raw export. It is more useful and protects your process.

The bottom line

• Maximum data: Semrush.
• Research that flows into tracking and briefs per client: SEO Runway.
• Clustering at scale: Keyword Insights.
• Value: SE Ranking.

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