Competitors Keywords Free Tools: What They Actually Show

You found a competitor's blog post ranking #1 for a term you care about. You want to know what else they're ranking for — the full picture, not just that one page. So you go looking for a free tool, paste in their URL, and get back a list. Looks useful. But then you try to act on it and realize: half the keywords are cut off, the volume numbers don't match anything else you've seen, and you can't export without upgrading.

That's the experience with almost every free competitor keyword tool. They're real tools with real data — but they each show you a different slice of reality, and none of them tell you upfront where the slice ends.

Here's what each major free option actually shows, what it hides, and when it's worth using.

What "Free" Usually Means in This Context

Before going tool by tool: free tiers in SEO software exist to get you into a paid funnel. That's not a criticism — it's just the model. The data you see for free is accurate enough to be useful but limited enough to leave you wanting more. Knowing where each tool's limit sits helps you decide whether the free tier is enough for your specific question.

Ubersuggest

What it shows: Organic keywords a domain ranks for, estimated traffic, keyword difficulty, and CPC. For free accounts, you get somewhere between 3 and 10 rows of results depending on the day and whether you're logged in.

What it hides: The vast majority of the keyword list. A competitor ranking for 4,000 keywords will show you maybe 10. There's no way to filter by page, topic cluster, or intent on the free tier.

When it's worth using: If you just want a quick gut-check — does this competitor rank for anything at all, roughly what's their traffic profile — Ubersuggest gives you that in 30 seconds. It's not useful for building a content strategy.

Google Search Console (Your Own Site)

What it shows: Every query your own site has appeared for in Google Search over the last 16 months. Clicks, impressions, CTR, average position. This is first-party data from Google itself — no estimation involved.

What it hides: Anything about competitors. GSC only shows your own site's data.

When it's worth using: GSC is the most underused free tool for finding your own gaps. If you're ranking in positions 8–20 for a keyword, you're getting impressions but almost no clicks. Those are your easiest wins — you already have some relevance, you just need better content. That's a different task than competitor research, but it's a free data source most people don't fully use.

Semrush Free Account

What it shows: Up to 10 results per domain overview report. Keyword positions, estimated volume, traffic share. The data is high quality — Semrush has one of the larger keyword databases around.

What it hides: Everything past row 10. You also get a limited number of searches per day (10 for free accounts). Running a proper competitor keyword analysis requires seeing hundreds or thousands of rows, which isn't possible on the free tier.

When it's worth using: Semrush free is useful for spot-checking a specific competitor's top keywords or getting a rough traffic estimate. If you see a competitor pulling 80K monthly visits, that's signal enough to know they've invested heavily in content. The free tier won't tell you where that traffic comes from.

Ahrefs Free Tools (Webmaster Tools + Site Explorer Preview)

What it shows: Ahrefs Webmaster Tools is free for your own site — full keyword data, backlinks, health scores. For competitor sites, the free version of Site Explorer shows you the top 10 organic keywords and a traffic estimate.

What it hides: Everything past the top 10 for competitor sites. Ahrefs's keyword database is widely considered the most accurate for traffic estimation, so even the preview is useful — but 10 rows won't show you the long-tail content a competitor has built out.

When it's worth using: If you want the most reliable traffic estimate for a competitor site, Ahrefs's preview number is worth trusting. For your own site, their free Webmaster Tools is genuinely excellent — full data, no cost, just requires verifying ownership.

Moz Free Account

What it shows: Domain Authority, some keyword data, and limited SERP analysis. The free tier has become more restricted over time.

What it hides: Detailed keyword lists. Moz's strength has always been link data, and their keyword tooling on the free tier reflects that — it's not the primary use case.

When it's worth using: If you're specifically trying to understand domain authority comparisons, Moz's free DA scores are still a useful benchmark. For keyword research, there are better free options.

Google's Own Free Sources

Two underrated free tools:

Google Keyword Planner — Originally built for advertisers, it shows search volume ranges and related terms. You can type in a competitor's URL and get keyword ideas Google thinks are relevant to their content. The volume ranges are wide (1K–10K rather than a specific number), but the keyword ideas themselves are solid.

"People Also Ask" and related searches — Not a tool exactly, but searching for topics your competitor covers and reading through PAA boxes and related searches at the bottom of results gives you real insight into how Google clusters intent around a topic. It's slow manual work, but it's free and accurate.

The Core Limitation They All Share

Free tools show you keywords. What they don't show you is the gap — specifically, which keywords your competitors are capturing that you are not. That comparison requires running both domains through the same analysis simultaneously and filtering for overlap.

If you want to find ranking gaps between your site and a competitor, you need either a paid tool or a tool specifically built to surface those gaps. There are a few approaches:

Run both domains through Semrush or Ahrefs on a paid trial, export the keyword lists, and do the comparison in a spreadsheet using VLOOKUP or a pivot table. Tedious but doable.
Use a dedicated gap analysis feature — Semrush's Keyword Gap tool and Ahrefs's Content Gap tool both do this well on paid plans.
Use a service like Rankfill, which maps every keyword your competitors are capturing that your site is missing and delivers a full content plan built around those gaps.

The spreadsheet method works if you have the time and access to exports. The dedicated tools are faster if you're already paying for them. Either way, the free tier versions of any tool won't get you there — they're previews, not full analyses.

What to Actually Do With Free Tools

If budget is genuinely the constraint right now, here's a sequence that gets you real signal:

Use Ahrefs Webmaster Tools on your own site to see what you're already ranking for and where you're leaking clicks (positions 8–20).
Use Semrush's free overview on two or three competitor domains to understand their rough traffic scale.
Use Google Keyword Planner with a competitor's URL to generate keyword ideas.
Cross-reference those ideas against your own GSC data to find terms they appear to rank for that you don't have content for at all.

This won't give you a clean competitor-vs-you gap report. But it gives you enough directional information to start building a list. From there, the question becomes whether you want to find and target competitor keywords systematically or work from a manually built shortlist.

FAQ

Are free keyword tools accurate? The keyword suggestions are generally accurate. The volume numbers are estimates and vary significantly between tools — sometimes by 2x or more. Use them for directional decisions, not precise forecasting.

Why do different tools show different traffic numbers for the same site? Each tool estimates traffic by combining their keyword database with click-through rate models. Their databases are different sizes and use different data sources. Ahrefs tends to be considered most accurate for traffic estimates; Semrush has a larger keyword database overall.

Can I see all the keywords a competitor ranks for for free? No. Every free tool caps the rows you can see. You might get 10, you might get 50 — but competitors often rank for thousands of keywords. The full list requires a paid tool or export.

What's the best free tool for a quick competitor check? Semrush's free overview gives you the best combination of keyword data and traffic estimate in one place, even if you can only see 10 rows. Ahrefs is more accurate on traffic numbers but shows similar limitations.

If I upgrade to a paid tool, which is worth it? Ahrefs and Semrush are the two serious options. Ahrefs is better for backlink analysis and traffic accuracy. Semrush has a larger keyword database and better site audit tooling. Both offer trials. If your primary goal is keyword research and competitor analysis, either will do the job.

What's the difference between seeing competitor keywords and finding content gaps? Seeing competitor keywords tells you what they rank for. Finding content gaps tells you which of those keywords you don't have any content targeting. The second question is more actionable — it tells you exactly what to build. Most free tools answer the first question partially. The second question requires comparing two domains simultaneously.