Free Competitor Keyword Analysis Tools Compared

You typed a competitor's domain into a tool, hit enter, and got back a wall of keywords — thousands of them, locked behind a paywall. The free version showed you maybe 10. You can see the shape of the data but not the data itself. So you open another tab, try a different tool, get 10 different keywords, and now you have 20 keywords that may or may not be the ones actually driving your competitor's traffic.

That loop is what most people are stuck in. This article breaks it down: which free tools actually give you usable competitor keyword data, what each one's real limit is, and how to combine them so you're not flying blind.

What You're Actually Trying to Do

Before comparing tools, it helps to be clear on the goal. You're not trying to see every keyword your competitor ranks for. You're trying to find the ones worth going after — keywords where:

• Your competitor ranks and you don't
• The search volume justifies the effort
• You have a realistic shot at ranking

That's a narrower question than "show me all their keywords," and it changes which tools are actually useful. For a deeper look at the methodology, Keyword Competitive Analysis: How to Find Ranking Gaps walks through the full process.

The Tools, Honestly Compared

Google Search Console (Free, Unlimited — Your Own Site Only)

Not a competitor analysis tool in the traditional sense, but start here anyway. GSC shows you exactly which queries your site ranks for, including ones you didn't target. This is the baseline you need before looking at competitors — you need to know where you are before you can measure the gap.

What you get for free: Full query data for your own site. No keyword cap.

The limit: You can't see competitor data. At all.

Use it for: Establishing your own keyword footprint before doing gap analysis.

Ubersuggest (Free Tier)

Neil Patel's tool offers competitor keyword data on a free plan, but the limits are aggressive. You get 3 free searches per day, and competitor keyword results are capped — typically showing 5–10 keywords before prompting an upgrade. The data itself is decent for head terms but thin on long-tail.

What you get for free: A small window into a competitor's top keywords. Keyword difficulty scores. Some traffic estimates.

The limit: 3 searches/day. Very limited keyword rows. Long-tail coverage is weak.

Use it for: A quick sanity check on what a competitor's top few keywords are.

Semrush (Free Account)

Semrush has one of the largest keyword databases in the industry. The free account is more generous than most people expect — you get 10 searches per day, and each search returns up to 10 keyword results for a competitor domain. The quality of the data is high; the quantity is the constraint.

What you get for free: 10 domain searches per day. Top 10 organic keywords per domain. Position, volume, and difficulty data included.

The limit: 10 keywords per competitor is genuinely not enough for gap analysis. You'll see their biggest keywords, not the mid-tail ones where real opportunity often lives.

Use it for: Identifying a competitor's top branded and category keywords quickly.

Ahrefs (Free Webmaster Tools)

Ahrefs' free tier is called Webmaster Tools and it's worth noting: it only works for sites you verify ownership of. You can't use it to look up competitors. The free version is purely for auditing your own site's backlinks and keyword rankings.

What you get for free: Full data for verified sites you own.

The limit: Zero competitor visibility. This isn't a competitor analysis tool in free mode.

Use it for: Understanding your own site's keyword and backlink profile.

Moz Keyword Explorer (Free Account)

Moz gives you 10 free queries per month on the free plan. Each query can be a competitor's domain. The data includes top-ranking keywords, difficulty, and opportunity scores. Ten queries per month is not much, but the quality is solid and the interface is cleaner than most.

What you get for free: 10 queries/month. Keyword list per domain (limited rows). Difficulty and opportunity scores.

The limit: 10 queries a month goes fast. Results per domain are capped.

Use it for: Occasional competitive spot-checks when you've already done your research and want a second opinion.

SpyFu (Free Tier)

SpyFu is underrated for free competitor research. The free version lets you see a competitor's top organic and paid keywords with more rows than most tools at this tier — roughly 5–10 organic keywords per domain lookup, but they surface some genuinely useful ones. Historical ranking data is partially visible.

What you get for free: Organic and paid keyword overlap. A few rows of competitor keywords. Some historical data.

The limit: Caps are hit quickly. Data depth is limited compared to paid tiers.

Use it for: Getting a simultaneous view of what a competitor does in organic and paid search.

Google's Free Suite (Keyword Planner + Search Operator Tricks)

Google Keyword Planner is free with a Google Ads account. It won't show you a competitor's keyword list directly, but if you enter a competitor's URL as a "website to get keyword ideas," it will surface keywords related to their content. It's indirect — you're seeing what Google associates with their site, not confirmed rankings.

Search operators like site:competitor.com combined with topic modifiers can surface content they've built around specific keyword clusters. Slow, manual, but free.

What you get for free: Topic clusters associated with a competitor's domain. Volume data (in ranges, not exact).

The limit: Not actual ranking data. Volume data is bucketed, not precise.

Use it for: Generating keyword ideas based on a competitor's content strategy.

How to Stack These Tools Without Paying

The honest answer is that no single free tool gives you a complete picture. But combining them gets you further than you'd expect:

1. Start with GSC to know your own keyword footprint
2. Use Semrush's free 10 searches to identify a competitor's top 10 keywords
3. Cross-reference with SpyFu to see if any of those are paid keywords (signals commercial value)
4. Run the competitor's URL through Keyword Planner to surface adjacent topic clusters
5. Use Moz's 10 monthly queries strategically — save them for competitors you're most serious about

This stack gives you a working view of the gap. It's manual and time-capped, but it works for 2–3 serious competitors. For a more systematic look at the process, How to Find and Target Your Competitor Keywords goes step by step.

Where Free Tools Break Down

Free tiers are designed to show you enough to want more. The genuine limitations are:

• Volume: You might see 10–50 keywords per competitor when they rank for thousands
• Long-tail coverage: Free tiers surface head terms. The mid- and long-tail keywords — where gaps are often easier to close — are behind paywalls
• Gap analysis: None of the free tools above will automatically compare your site's rankings against a competitor's and show you only the keywords they have that you don't

That last point is the one that actually costs you. Manual gap analysis across free tool exports is doable but slow. Competitor Keyword Analysis: Uncover What You're Missing explains the gap analysis method if you want to do it by hand.

If you want this done systematically across multiple competitors without stitching together free tiers, Rankfill maps every keyword opportunity your competitors are capturing that your site is missing — including traffic estimates and a content plan to capture them.

What to Do With the Keywords You Find

Finding gaps is step one. Closing them requires content that can actually rank. A few things that matter here:

• Match search intent exactly. A keyword like "competitor keyword analysis tool free" needs a comparison article, not a definition post
• Don't just target head terms. Long-tail variants of the same topic are easier to rank for and often convert better
• Prioritize by traffic potential, not just volume. High-volume keywords with strong competition take longer to move. Mid-volume keywords with weaker competitors are often faster wins

For a full methodology on how to prioritize what you find, Keyword Research Competitor Analysis: A Step-by-Step Guide is worth reading through.

FAQ

Can I really do competitor keyword analysis for free? Yes, with real limitations. Free tools show you a slice of a competitor's top keywords — usually 5–10 per search. For surface-level competitive research, that's enough to get started. For serious gap analysis across multiple competitors, you'll hit walls quickly.

Which free tool shows the most competitor keywords? Semrush's free account tends to show the most accurate data per search. SpyFu is a close second and also shows paid keywords, which adds useful context.

Is Ahrefs free for competitor analysis? No. Ahrefs' free Webmaster Tools only works for sites you own and verify. It has no free competitor lookup capability.

How many competitors should I analyze? Start with 2–3 direct competitors — the ones ranking on page one for your most important keywords. More than that, and the data becomes hard to act on without better tooling.

What's the difference between competitor keyword analysis and keyword gap analysis? Competitor keyword analysis shows you what keywords a competitor ranks for. Keyword gap analysis narrows that to keywords they rank for that you don't — which is the actually useful subset. Most free tools do the former; the latter usually requires either a paid tool or manual cross-referencing.

Do free tools show accurate search volume? Roughly, yes. Google Keyword Planner shows bucketed ranges. Semrush and Moz show point estimates that are directionally accurate but not exact. For prioritization purposes, they're good enough.