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Data from agency case studies
OpenServed tracks thousands of case studies from marketing agencies. This is where we dig into that data: which services and industries actually show up in the numbers, how agency case studies are trending, and what the stats look like once you count them all up instead of reading them one at a time.
Agencies for Small vs Large Businesses: Does It Matter?
We compared 2,093 case studies to see whether agencies that mostly serve small businesses get better results for them than agencies that mostly serve large companies.
Industry-Specific vs Generalist Agencies: Does It Matter?
Should you hire an agency that knows your industry? We checked 2,641 case studies from 74 agencies. Industry experience doesn't predict bigger results, and focused agencies are rare.
Specialist vs Full-Service Agencies: Who Gets Better Results?
Specialist or full-service agency? We compared 2,523 case studies from 48 agencies. SEO specialists report about twice the traffic gains; for PPC, focus makes little difference.
How to Choose a Content Marketing Agency: 506 Case Studies
How to choose a content marketing agency, in seven steps drawn from 506 agency case studies: which kind of content you need, what traffic should turn into, and what to ask.
How to Choose a Social Media Ads Agency: 525 Case Studies
How to choose a social media ads agency, in seven steps drawn from 525 agency case studies: how to tell reach from results, what to ask about ROAS and spend, and the warning signs.
How to Choose a PPC Agency: What 818 Case Studies Show
How to choose a PPC agency, in seven steps drawn from 818 agency case studies: what a realistic result looks like, what to ask about cost and spend, and the warning signs.
How to Choose an SEO Agency: What 1,090 Case Studies Show
How to choose an SEO agency, in seven steps drawn from 1,090 agency case studies: what a realistic result looks like, what to ask for, and the warning signs to watch.
How to Choose a Digital Marketing Agency: 2,648 Case Studies
How to choose a digital marketing agency, in seven steps drawn from 2,648 agency case studies: which services you need, what a realistic result is, and what to ask.
SEO vs Social Media Ads: Results From 1,500+ Agency Case Studies
SEO vs social media ads, compared across 1,534 agency case studies: reported lead, conversion and revenue gains for each channel, by industry and client size.
PPC vs Social Media Ads: Results From 1,100+ Agency Case Studies
PPC vs social media ads, compared across 1,137 agency case studies: reported acquisition cost, ROAS, conversion and revenue results, by industry and client size.
SEO vs PPC: Results From 1,500+ Agency Case Studies
SEO vs PPC, compared across 1,569 agency case studies: reported lead, conversion and revenue gains for each channel alone and together, by industry and client size.
Content Marketing Statistics 2026: Results From 500+ Agency Case Studies
Content marketing statistics for 2026, drawn from 506 agency case studies: median traffic, ranking, lead and revenue results, with and without SEO, by industry and client size.
Social Media Ads Statistics 2026: Results From 500+ Agency Case Studies
Social media ads statistics for 2026, drawn from 525 agency case studies: median ROAS, acquisition cost, revenue and engagement results, by platform, industry and client size.
Digital Marketing Statistics 2026: Results From 2,600+ Agency Case Studies
Digital marketing statistics for 2026, drawn from 2,648 agency case studies: median traffic, lead, revenue and cost results by channel, industry, client size and country.
PPC Statistics 2026: Results From 800+ Agency Case Studies
PPC statistics for 2026, drawn from 818 agency case studies: median cost per acquisition, conversion, revenue and ROAS results, by industry, client size and country.
SEO Statistics 2026: Results From 1,000+ Agency Case Studies
SEO statistics for 2026, drawn from 1,090 agency case studies: median traffic, keyword, lead, conversion and revenue gains, by industry, client size and country.
We Analyzed 2,098 Marketing Case Studies. Here's What We Found
OpenServed's directory now holds 2,098 case studies from 69 agencies. We pulled the whole dataset apart to see what the numbers actually reveal.
The Rise of GEO: How 45 Case Studies Show Brands Optimizing for AI Search
We analyzed every GEO case study in OpenServed's directory. Just 2.2% of all case studies mention it, three agencies produce most of them, and the terminology hasn't settled yet.