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SpyFu vs SEMrush vs Ahrefs: Best Tool for Google Ads Competitor Research?

  • Writer: Jesse Heslinga
    Jesse Heslinga
  • 5 days ago
  • 9 min read

If you want to know what your competitors are bidding on, what their ads say, and roughly what they spend, three tools come up in almost every conversation: SpyFu, SEMrush, and Ahrefs. Choosing the wrong one means paying for features you won't use, or buying a tool that's too thin for the actual job.


I use SpyFu and SEMrush regularly in client accounts. Ahrefs is something I use for SEO work, and that context matters for what follows.


The Short Answer

  • SpyFu is built for PPC competitor research. It carries 18+ years of Google Ads history, spend estimates, and a full ad copy archive, all at a fraction of the price of the other two. For pure Google Ads competitor intelligence, it wins.

  • SEMrush is an all-in-one marketing platform with a solid PPC research module. At four times the price of SpyFu, it makes sense when your team also runs SEO, content, and technical audits, not just ads.

  • Ahrefs is an SEO tool with limited PPC data. It can show you what a competitor currently bids on, but no spend estimates, no ad history going back in time, and a thinner paid keyword database. It belongs in this comparison because people ask, not because it is a strong choice for Google Ads research.

  • For most lead-gen businesses, SpyFu is the right tool. SEMrush if your team also manages organic. Ahrefs: buy it for SEO and treat the PPC view as a bonus, not the reason.

The honest answer: it depends on what you already pay for

The core question is whether you need one tool for both paid and organic research, or specifically a PPC intelligence tool.


SpyFu does one thing well: PPC and SEO competitive intelligence. SEMrush does that, plus organic tracking, content marketing, technical site audits, and more. Ahrefs does organic SEO best, with PPC data as a secondary feature.


If Google Ads competitor research is the specific job, and you are not managing organic search alongside it, SpyFu does the job at a fraction of what SEMrush costs. If you or your team also handles organic, content strategy, or technical audits, SEMrush makes sense as a single platform. If you are buying Ahrefs for SEO work and want a quick look at competitor ads on the side, that data is there, but do not expect depth.

Pro Tip: Before spending anything on a tool, pull competitor examples from Google's Ads Transparency Center (free) and run an Auction Insights report from inside your own Google Ads account. Both give you real-time data. The paid tools add the layer underneath: long-term ad history, keyword gaps, and spend estimates.

How each tool actually works

SpyFu was built specifically for PPC and SEO competitive intelligence. Type in a competitor's domain and you get their full Google Ads history: every keyword they have bid on, estimated monthly spend, ad copy going back up to 18 years, and keyword overlap between their domain and yours. The ad history depth is the differentiator. You can see which ad variants a competitor tested, which they dropped, and which they kept running. That is signal on what has been proven to work for them.


SEMrush is a full marketing research platform. Its Advertising Research module covers competitor keyword lists, ad copy samples, estimated traffic, and share of voice across paid and organic search. The PPC data is solid, particularly for seeing how a competitor allocates spend across search terms. Where SEMrush earns its price is when you need paid, organic, backlink, and content data in the same account without switching tools.


Ahrefs is built for organic SEO, with a "Paid keywords" tab on domain reports showing what a competitor is currently bidding on and a sample of their current ads. No spend estimates. No historical ad archive. The paid keyword database is noticeably thinner than SpyFu's or SEMrush's. It works as a quick reference if you already subscribe to Ahrefs. It is not a tool to buy specifically for Google Ads competitor research.

What the numbers say

Pricing is where these tools separate most clearly.

Tool

Entry plan (monthly billing)

Mid tier

High tier

SpyFu

$39/month

$79/month

$299/month

SEMrush

$139.95/month

$249.95/month

$499.95/month

Ahrefs

$29/month (Starter, limited)

$129/month (Lite)

$249/month (Standard)

Annual billing reduces costs by roughly 17-25% across all three tools. SEMrush also offers a "Semrush One" bundle starting at $199/month combining SEO and AI visibility tools. Ahrefs' Starter plan is limited on export volume and history; the Lite plan at $129/month is the more honest comparison point.


Figures are directional; verify current pricing before committing.


SpyFu's Professional plan at $79/month covers everything most lead-gen businesses need: unlimited searches, keyword exports, and the full ad history archive. To get comparable PPC competitor depth in SEMrush, you are looking at the Guru plan at $249.95/month. That is a three times price gap, with a large part of it going to organic and content features outside the PPC scope.


Ahrefs' Lite plan at $129/month is still more expensive than SpyFu's Professional, and the PPC data is weaker. The entry-level Starter at $29/month is heavily limited on export volume and historical depth.

Where the tools actually split: PPC data depth

Pulling a competitor domain in SpyFu surfaces:

  • Every keyword they have bid on, month by month, over up to 18 years

  • Estimated monthly ad spend (directional)

  • Every ad variant they tested, with the ones they kept running flagged

  • Keyword overlap between your domain and theirs, auction by auction

  • Keywords the competitor ranks for organically but is NOT bidding on (often the most useful gap to find)

SEMrush shows comparable data, and the share-of-voice view across paid and organic is useful. The ad copy history is solid, though not as far back in time as SpyFu's.


Ahrefs shows what a competitor is currently bidding on and samples their current ads. No spend estimates. Historical depth is not there.


Keep in Mind: Spend estimates from all three tools are directional, not precise. They are calculated from click volume estimates and publicly available CPC data, and can be off by 30-40%. Use them to understand a competitor's scale and focus, not as an auditable budget figure.

SpyFu vs SEMrush vs Ahrefs, side by side

Dimension

SpyFu

SEMrush

Ahrefs

Google Ads history depth

18+ years

Strong, less historical range

Current view only

Spend estimation

Yes (directional)

Yes (directional)

No

Ad copy archive

Full history of tested variants

Solid archive

Current sample only

Keyword overlap view

Yes, your domain vs. competitor

Yes

Limited

Organic SEO data

Yes, included

Full suite

Best in class

Entry price (monthly)

$39/month

$139.95/month

$29-$129/month

Best at

PPC competitive intelligence

All-in-one marketing research

Organic SEO

For the Google Ads competitor research job, SpyFu wins on data depth and price. SEMrush wins on breadth. Ahrefs is the weakest option for this specific use case, regardless of how strong it is for SEO.

When SpyFu wins

Pick SpyFu if:

  • Google Ads competitor research is the primary or only job

  • You are managing competitive accounts and want deep ad history on a handful of competitor domains

  • Budget matters and you do not want to pay for SEO, content, or backlink features you will not use

  • You run regular PPC audits where the 18-year ad history gives a better read on what competitors have tested and what has stuck

SpyFu is the right call for most Google Ads managers who want to know what competitors are bidding on, what has worked in their ad copy, and where the keyword gaps are. The price gap versus SEMrush is hard to justify for pure PPC work.


Verdict: For pure Google Ads competitor intelligence, SpyFu is the most focused and most affordable option here.

When SEMrush wins

Pick SEMrush if:

  • Your marketing team manages paid and organic for the same clients or business

  • You already use SEMrush for SEO work and want to add paid competitor research to the same workflow

  • You need content research, technical site audits, or backlink analysis alongside the PPC data

  • Centralising on one subscription is worth the cost for your team's workflow

SEMrush earns its price when you use it across multiple channels. The PPC research quality is solid. The price gap versus SpyFu narrows when you factor in everything else the platform covers.


Verdict: SEMrush is right when the use case goes beyond Google Ads. For PPC-only competitor research, SpyFu's depth-per-euro is better.

Common mistake: Buying SEMrush specifically for Google Ads competitor research when SpyFu covers that job at about a third of the cost. The Advertising Research module in SEMrush is good, but you are paying for organic and content tools whether you use them or not.

When Ahrefs wins

For Google Ads competitor research specifically, Ahrefs does not win compared to these two.


If you already subscribe to Ahrefs for SEO, the paid keywords tab gives a quick read on what a competitor is bidding on right now. That is useful as a reference. It is not a reason to buy the tool.


Buying Ahrefs specifically for Google Ads competitor intelligence would be a mistake. The database is thinner, spend estimates do not exist, and the ad history is not there. You would still need SpyFu or SEMrush for the actual PPC work.


Ahrefs is a strong tool for the right job. When the question shifts to whether paid or organic search makes more sense for a service business, Ahrefs becomes relevant. For Google Ads competitor research, it stays on the bench.


Verdict: Buy Ahrefs for SEO. Do not buy it for Google Ads competitor research.

Common mistakes

  • Paying for SEMrush Guru tier to access PPC competitor features that SpyFu Professional covers at less than a third of the cost.

  • Treating spend estimates as accurate budget figures. A competitor showing $15k/month in SpyFu might be spending $10k or $22k. Use the number to judge scale and focus, not as a planning input.

  • Running a competitor keyword check once at account setup and never again. Competitor focus shifts with the season, with campaign restarts, and with changes in their business. Monthly spot-checks catch the meaningful moves.

  • Skipping Google's own free data first: Auction Insights inside Google Ads shows real impression share by competitor. Ads Transparency Center shows current ad copy. Both are live, not estimated. Third-party tools go deeper, but start with what is already there.

  • Overlooking the "keywords they rank for but do not bid on" gap in SpyFu. That is often where the lower-competition, lower-cost leads sit.

How I handle this for lead-gen businesses

In most client accounts I use SpyFu for competitor keyword and ad research. In accounts where we also manage organic or need broader marketing data, SEMrush. Ahrefs stays in the SEO work.


For a lead-gen service business spending 5,000-20,000 euros per month on Google Ads, the competitor research job is specific: see what they bid on, read what their ads say, find the keyword clusters they own that you are not in, and spot where they are spending on traffic that does not convert. SpyFu does all of that.


Competitor research is part of what gets done in a properly run account, not a one-off audit. If you are managing Google Ads in-house, it is one more piece to keep current. If you are weighing whether running Google Ads in-house makes sense for your business, the tool overhead is worth factoring in.

Ready to see what your competitors are doing? A competitor analysis is part of every account review I do at Groove Media. If you want to know where your budget stands relative to what the main competitors in your market are spending, book a call.

Frequently Asked Questions

SpyFu wins for Google Ads competitor research specifically. It has more historical ad data, the same directional spend estimates as SEMrush, and a significantly lower price. SEMrush wins if you also need organic SEO, content, or backlink tools in the same platform. The PPC data in both tools is solid; the price gap is what makes SpyFu the better call for pure ad intelligence.

Ahrefs shows the keywords a competitor is currently bidding on and samples of their current ads, but no spend estimates, no ad copy history going back in time, and a thinner paid keyword database than SpyFu or SEMrush. It works as a quick reference if you already have an Ahrefs subscription. Not a tool to buy specifically for Google Ads research.

Both are directional. They estimate from click volume and publicly available CPC data, and can be off by 30-40%. Use them to gauge a competitor's relative scale (are they a 2k/month advertiser or a 20k/month one?) and where they focus their budget, not as precise numbers.

SpyFu's database is strongest for the US market. UK and Australian data exists but is less comprehensive. For Netherlands, Belgium, Germany, or other EU markets, both SpyFu and SEMrush have noticeably thinner coverage than for US accounts. Check a sample domain in your specific market before committing to a plan.

Only if you use SEMrush for non-PPC work (SEO, content, site audits) and want deeper Google Ads ad history than SEMrush provides. Running both specifically for PPC competitor research is overlap you do not need.

Monthly at minimum, and any time you see a meaningful performance change: a CPL spike, a drop in impression share, or a shift in conversion rate. Competitor ad spend and focus shift with the season. A quarterly deep audit plus monthly spot-checks is a reasonable routine. Also worth checking after your CPL starts creeping up, since a competitor entering your auctions is one of the common causes. See also: why Google Ads cost per lead goes up.

About the author

Jesse Heslinga | Google Partner | 7+ Years Google Ads | Lead-Gen Expert


jesse_heslinga_groove_media

I run Google Ads for lead-gen service businesses at Groove Media across clinics, home services, and professional services, working with clients directly, no account-manager layer. I build every account around one question: is this spend turning into real customers, not just cheap form fills?

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