PPC competitor research tools: ad libraries vs ad finders

PPC competitor research tools come in two layers. Underneath are the official ad libraries run by Google, Meta and LinkedIn, which are free and exact. On top are lookup tools built on that public ad data, which hand you a summary. This comparison sets the two side by side and explains where seogeoaeo.ai's ad finders save time, and where the libraries alone are enough.

What every paid-ads researcher wants to know

• Is this rival advertising at all, and where?
• What formats does it use?
• Which ads has it kept running for a long time?
• What does the copy say, and what offer does it lead with?
• How much does it spend, and on which keywords?

The first four are answerable. The last one mostly is not, for anyone, and any tool that claims otherwise is guessing.

The official libraries

Google Ads Transparency Center. A searchable hub of ads from verified advertisers. Search by advertiser and see each ad's format, the regions it ran in and when it was last shown. It does not show spend for commercial ads, and Google does not publish the keywords an advertiser bids on.

Meta Ad Library. Lets anyone search the active ads running across Meta's apps. Spend, reach and who paid are shown only for ads about social issues, elections or politics, which stay in the library for seven years.

LinkedIn Ad Library. Covers ads that ran on LinkedIn after June 1, 2023, and keeps each one for a year after its last impression. You can search by company, payer, keyword, country and date range. Spend is not among the details it lists.

All three cost nothing. Their weakness is that you click through ads one at a time and do the counting yourself.

The summary layer on seogeoaeo.ai

The useful part is the duration. An ad a rival has kept paying for over months is the one worth studying; a summary that shows how long each ad has run makes it easy to spot.

Meta Ad Finder also has a keyword mode, which lists every active ad mentioning a phrase. That is a fast way to see who else is advertising around your category, not only the rivals you already know.

Head to head

Which to use

Use the libraries when you are checking one rival once, or when you need an ad's image or video, which the finders link to rather than show.

Use the finders when you check several rivals on a schedule. Checking five competitors across Google, Meta and LinkedIn costs 125 credits, and because every tool is available over MCP and REST, an AI agent can run the same checks each month and note what changed.

Pair ads with the organic picture

Ads tell you what a rival pays to say. Its organic rankings tell you what it earns without paying. Domain Overview (50 credits) shows both sides for a domain: estimated Google visits and their ad value, plus the keywords it pays for with an estimated monthly ad spend. That spend figure is a model from search data, not the advertiser's real bill, so use it to compare rivals rather than quote it.

The honest trade-off

If you only need to glance at one company's Facebook ads, the Meta Ad Library alone is the better choice; there is nothing to pay and nothing to set up. The finders earn their credits when you compare rivals or automate the check. Run Competitor Google Ads on a rival's domain to see the summary format.