The Best SEO Agencies in the World: 2023 Edition

This report takes a quantitative approach to determining the best SEO agencies in the world. Our team created a weighted algorithm based on a combination of external signals (e.g. publicly available clients, online reviews, online reputation). The main factors in our analysis are listed below, along with each factor’s respective weight in our algorithm. 

• Years in Business: This factor evaluates SEO agencies on longevity alone, given that surviving the business world as well as Google’s many algorithm updates proves some degree of adaptability and commitment to sound SEO strategy. [ Algorithm weight: .14 ]

• Agency Size: This factor favors slightly larger firms (which, in the world of SEO agencies, means 50+ employees) as they’re likely to have more resources to devote to each client as well as longer-tenured employees.  [ Algorithm weight: .18 ]

• Headquarters Location: This factor matters only insofar as it hints at how plugged-in a company is to high quality employees, SEO events, and the tech community at large. We give location the least weight in our algorithm. [ Algorithm weight: .09 ]

• Client Success Score: This numerical value evaluates an agency’s past clients, awards, and reviews. [ Algorithm weight: .26 ]

• Online Reputation Score: This metric is based on the SEO agency’s employee reviews and the favorability of language about it on popular social media channels.  [ Algorithm weight: .18 ]
• Notable Clients: This factor evaluates an agency on the notability of the companies that have either publicly mentioned their partnership or are listed on their website. [ Algorithm weight: .15 ]

The table below rank orders the 20 SEO Agencies that had the highest overall rating in our study. We further refine the dataset by listing each agency’s stated SEO specialty and price range.

The Best SEO Agencies in the World in 2023

The Top SEO Agencies by Specialty

Below, we’ve pulled from our dataset the SEO agency with the highest overall score, organized by SEO specialty. 

The Top SEO Agencies by Price Range

The table below identifies the highest-scoring SEO agencies in each of four price categories. 

The Top SEO Agencies in the World, Descriptions & Reviews

Below we provide brief descriptions as well as a summary of client reviews for each company:

First Page Sage

First Page Sage is the largest SEO company in the US, and specializes in achieving high ROI for their clients through combining expert-level thought leadership content with an in-depth understanding of search intent. Their approach emphasizes content quality and positioning their clients as leading industry authorities.

Duffy Agency

Duffy Agency specializes in working with international brands, helping them develop SEO strategies to target markets across multiple countries. They translate nuanced technical knowledge into multiple languages, tailoring their approach to each audience.

Rankings 

Rankings specializes in providing SEO for personal injury attorneys, helping them stand out in a highly competitive search environment. They also offer PPC, Google Local, and web design services, helping their legal clients build a digital marketing strategy that combines paid and organic channels.

Minty Digital

Minty Digital combines PR with international SEO, and specializes in working with travel, leisure, and lifestyle ecommerce brands. They’re particularly adept in Shopify SEO, and provide ongoing support for clients.

Searchbloom

Searchbloom are digital marketing generalists, offering both paid search and SEO. They place their focus on keyword research and technical optimizations, so they work best with businesses that have strong existing content.

Titan Growth

Titan Growth’s services hinge on proprietary software that seeks to emulate the way search engines crawl websites, but their approach places more of an emphasis on paid channels than most SEO agencies. They also offer paid media management, video production, and Amazon marketing services in addition to SEO. 

Clay Agency

Clay Agency emphasizes branding, UI/UX design, and digital product design. They specialize in working with high profile tech startups and major consumer brands, and they can back up their marketing efforts with app development services.

Aumcore

Aumcore is a consumer-focused SEO agency, focusing on mobile SEO and voice search for ecommerce brands. They support their organic search services with PPC and social media management, and have particular expertise working with the pharmaceutical industry.

Boostability

Boostability offers white label SEO: unlike the other companies on this list, they offer most of their services through other marketing agencies. They partner with growing marketing firms who lack SEO expertise, allowing those firms to offer a full suite of SEO services.

Polaris

Based in London, Polaris focuses on SEO for companies in Europe and the UK. They also offer website migration services, as well as LinkedIn-based ABM.

kloos

kloos are a generalist SEO agency, with an emphasis on combining organic search with Google Ads, web analytics, and social media marketing. Based in Vienna, they also offer workshops and training courses to help train in-house SEO teams.

Zo Digital

Zo Digital is based in Japan, and specializes in working with startups and other fast-growing businesses. They emphasize data and analytics, and are particularly adept at promoting Japanese B2B and B2C brands internationally.

Sheng Li Digital

Sheng Li Digital works with businesses seeking a Chinese audience, helping them to craft messages that resonate in the Chinese market. Rather than taking a direct translation approach, they build holistic strategies that account for cultural differences.

eStore Factory

Unlike most agencies on this list, whose SEO services focus on Google search, eStore Factory focuses on Amazon SEO. They also help clients optimize their product listings, Amazon storefront, and also offer Amazon PPC management services.

Marketing Eye

Marketing Eye’s SEO services are primarily technical, though they also offer strategic consulting for their clients. They also provide conversion optimization, making them a good fit for businesses who have strong in-house content teams.

Big Leap 

Big Leap is a generalist SEO firm, offering a suite of technical SEO, local search optimization, and link building services. They take a holistic approach, and are particularly successful in their B2C work.

Delante

Delante specializes in the technical side of SEO and performing in-depth website audits. Their original content services are limited, however, and businesses that lack existing content will find Delante’s expertise difficult to capitalize on.

ReachLocal

ReachLocal (now LocaliQ) works with small businesses who need geotargeted SEO, helping those businesses rank for local searches. To support their focus, ReachLocal also offers Google My Business listing management and social media marketing services.

Incrementors Web Solutions

Incrementors offers a wide range of digital marketing services, providing graphic design, web development, and video marketing in addition to SEO. They are a particularly good fit for smaller companies that are heavily cost-constrained in their marketing efforts.

Stellar SEO

Stellar SEO specializes in link building and guest posting, orchestrating custom outreach campaigns to improve clients’ domain ratings, and by extension, their visibility. Their services are most effective for businesses who already have keyword optimized content, but relatively new websites with low Google authority.

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Evan Bailyn

Evan Bailyn is a bestselling author and award-winning speaker on the subjects of SEO and thought leadership. Contact Evan here.