OpenServed

BlogAuthor

Le Tuan Binh

Founder of OpenServed

Le Tuan Binh founded OpenServed to show which marketing agency results you can actually believe. Every agency publishes case studies, and every one reads like a highlight reel. Star ratings don't fix that: they show how an agency handles review requests, not whether it gets clients results.

Le Tuan Binh built and maintains the OpenServed dataset of 7,724 case studies from 331 agencies, classifying each one by service, client industry, client size, the results reported and how long they took. Every statistic on the OpenServed blog comes from that data.

Le Tuan Binh also designed how OpenServed verifies case studies with the clients named in them and how it ranks agencies, weighting confirmed results far above unconfirmed claims.

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Articles by Le Tuan Binh

How to Choose a GEO Agency in 2026: 142 Case Studies

How to choose a GEO (generative engine optimization) agency in 2026, in 10 steps drawn from 142 case studies: how AI results are measured, platforms, pricing, timelines and what to ask.

How to Choose a Local SEO Agency in 2026: 352 Case Studies

How to choose a local SEO agency in 2026, in 10 steps drawn from 352 case studies: calls over rankings, your Google Business Profile, reviews, pricing, timelines and what to ask.

How to Choose a Branding Agency in 2026: 801 Case Studies

How to choose a branding agency in 2026, in 10 steps drawn from 801 case studies: what you're buying, strategy before design, judging the work, pricing, timelines and measuring a brand.

How to Choose a Lead Generation Agency in 2026: 807 Case Studies

How to choose a lead generation agency in 2026, in 10 steps drawn from 807 case studies: leads or meetings, monthly rates, what counts as a lead, cost, pilots and what to ask.

How to Choose an Email Marketing Agency in 2026: 595 Case Studies

How to choose an email marketing agency in 2026, in 10 steps drawn from 595 case studies: ecommerce vs B2B, what email achieved, metrics beyond opens, deliverability, pricing and what to ask.

How to Choose a Conversion Rate Optimization (CRO) Agency in 2026

How to choose a conversion rate optimization (CRO) agency in 2026, in 10 steps drawn from 400 case studies: realistic lifts, testing, traffic, pricing, timelines and what to ask.

How to Choose a Web Development Agency in 2026: 1,140 Case Studies

How to choose a web development agency in 2026, in 10 steps drawn from 1,140 case studies: what a build should achieve, platforms, migrations, pricing, code ownership and what to ask.

How to Choose a Web Design Agency in 2026: 1,833 Case Studies

How to choose a web design agency in 2026, in 10 steps drawn from 1,833 case studies: what a redesign should achieve, SEO, platforms, pricing, timelines and what to ask.

Content Marketing vs Social Media Ads: Which Is Better? Data From 2,600+ Case Studies

Content marketing vs social media ads compared: key differences, pros and cons, speed and what 2,622 real agency case studies show about traffic, leads, revenue and reach.

Web Design vs Web Development: Differences and Results From 2,200+ Projects

Web design vs web development: the key differences, what each job involves, which one your project needs, and what 2,272 real website projects show about traffic, leads and revenue.

Content Marketing vs PPC: Which Is Better? Data From 3,600+ Case Studies

Content marketing vs PPC compared: key differences, pros and cons, speed, ROI and what 3,623 real agency case studies show about traffic, leads and revenue, by industry and business size.

SEO vs Content Marketing: Differences and Results From 3,800+ Case Studies

SEO vs content marketing: the key differences, how they work together, which to start with, and what 3,874 real agency case studies show about traffic, leads and revenue from each.

GEO Statistics 2026: 70+ Original Stats From 142 Case Studies

70+ original GEO statistics for 2026 from 142 case studies by 68 agencies: AI referral traffic, AI visibility and citations, which AI platforms matter, and how GEO is sold.

Local SEO Statistics 2026: 80+ Original Stats

80+ original local SEO statistics for 2026 from 352 agency case studies: organic traffic, calls, leads and Google Business Profile results, by industry, client size and location.

Branding Statistics 2026: 70+ Original Stats

70+ original branding statistics for 2026 from 801 agency case studies: what branding projects deliver, how often they're measured, and the traffic, social and revenue gains they report.

Lead Generation Statistics 2026: 70+ Original Stats

70+ lead generation statistics from 807 real agency campaigns: meetings booked per month, leads per month, pipeline, cost per lead, marketing-led vs sales-led, by industry and size. Updated November 2026.

Email Marketing Statistics 2026: 80+ Original Stats

80+ email marketing statistics from 595 real agency campaigns: email revenue, open rates, list growth, leads, ecommerce vs B2B email, by industry and business size. Updated November 2026.

Conversion Rate Optimization (CRO) Statistics 2026: 70+ Original Stats

70+ CRO statistics from 400 real agency campaigns: conversion rate lifts, leads, revenue, cost per lead, CRO with PPC, ecommerce CRO, by industry and business size. Updated November 2026.

Web Development Statistics 2026: 100+ Original Stats

100+ web development statistics from 1,140 real builds: traffic, leads, revenue, load time, ecommerce builds and migrations, with vs without SEO, by industry and size. Updated November 2026.

Web Design Statistics 2026: 100+ Original Stats

100+ web design statistics from 1,833 real website projects: traffic, leads, conversion rate, bounce rate and speed after a redesign, with vs without SEO, by industry and size. Updated November 2026.

Agencies for Small vs Large Businesses: Does It Matter?

Big agency or small? Built for businesses your size or not? We compared 7,721 case studies: results by agency size and client size, pros and cons, and how to choose.

Industry-Specific vs Generalist Agencies: Does It Matter?

Should you hire an agency that knows your industry? We checked 7,682 case studies from 329 agencies: results, pros and cons, cost, when it matters and how to choose.

Specialist vs Full-Service Agencies: Who Gets Better Results?

Specialist or full-service agency? We compared 7,106 case studies from 215 agencies: results by service, pros and cons, cost, the hybrid option and how to choose.

How to Choose a Content Marketing Agency in 2026: 1,653 Case Studies

How to choose a content marketing agency in 2026, in 10 steps drawn from 1,653 case studies: search vs reach content, what traffic becomes, timelines, pricing and what to ask.

How to Choose a Social Media Ads Agency in 2026: 1,261 Case Studies

How to choose a social media ads agency in 2026, in 10 steps drawn from 1,261 case studies: reach vs results, platforms, creative, ROAS and spend, timelines and what to ask.

How to Choose a PPC Agency in 2026: What 2,137 Case Studies Show

How to choose a PPC agency in 2026, in 10 steps drawn from 2,137 agency case studies: realistic cost cuts, ad spend and fees, timelines, account ownership and what to ask.

How to Choose an SEO Agency in 2026: What 2,794 Case Studies Show

How to choose an SEO agency in 2026, in 10 steps drawn from 2,794 agency case studies: realistic results, how long SEO takes, vetting case studies, AI search and what to ask.

How to Choose a Digital Marketing Agency in 2026: 7,721 Case Studies

How to choose a digital marketing agency in 2026, in 10 steps drawn from 7,721 agency case studies: services, budget, realistic results, vetting case studies and what to ask.

SEO vs Social Media Ads: Which Is Better? Data From 3,800+ Case Studies

SEO vs social media ads compared: key differences, pros and cons, speed, cost and what 3,864 real agency case studies show about leads and revenue, by industry and business size.

PPC vs Social Media Ads: Which Is Better? Data From 2,900+ Case Studies

PPC vs social media ads compared: key differences, pros and cons, cost per acquisition, ROAS and speed, from 2,933 real agency case studies, by industry and business size.

SEO vs PPC: Which Is Better? Data From 4,100+ Case Studies

SEO vs PPC compared: key differences, pros and cons, cost and speed, and what 4,116 real agency case studies show about leads, revenue and results, by industry and business size.

Content Marketing Statistics 2026: 100+ Original Stats

100+ content marketing statistics from 1,653 real agency campaigns: traffic, rankings, leads, revenue and reach, with vs without SEO, by industry and business size. Updated November 2026.

Social Media Ads Statistics 2026: 100+ Original Stats

100+ social media ads statistics from 1,261 real agency campaigns: cost per acquisition, ROAS, revenue, Meta and TikTok, social ads vs PPC, by industry and business size. Updated November 2026.

Digital Marketing Statistics 2026: 150+ Original Stats

150+ digital marketing statistics from 7,721 real agency campaigns: ROI, SEO, PPC, social, email, content, AI search, small business and more. Updated November 2026.

PPC Statistics 2026: 100+ Original Stats

100+ PPC statistics from 2,137 real agency campaigns: cost per acquisition, ROAS, conversions, revenue, PPC vs SEO and social ads, by industry and business size. Updated November 2026.

SEO Statistics 2026: 100+ Original Stats

100+ SEO statistics from 2,794 real agency campaigns: organic traffic, rankings, leads, revenue, SEO vs PPC, local and AI search, by industry and business size. Updated November 2026.