In 2023, Mark spent $10,000 on a top-tier SEO agency. He expected a flood of customers, but his traffic barely budged. He felt fooled and out of cash, so he turned to Upspell.
SEO will be a $65 billion industry in 2025. Big names promise big results—often at big prices. Small businesses can’t always afford that gamble. For whoever can, we have dug into real data on 11 leading international SEO agencies. We checked reviews, traffic, domain authority, and backlinks.
On the page that follows, you’ll see who truly delivers. You’ll learn which agencies drive the most visits, earn the best client ratings, and build the strongest online presence. Then you can confidently decide—no wasted budgets, no empty promises.
Let’s get started, but first, let’s learn the methodology behind the topic Top Ranked 11 International SEO Agencies in 2025
Methodology Behind Finding Top 11 International SEO Agency
To find the top ranked international SEO agencies of 2025, Upspell and its team have built this ranking by gathering real data from public sources.
We visited each agency’s website and checked their “About” pages and their LinkedIn profiles. We noted their headquarters, team size, and minimum project budgets. When info was missing, we estimated based on industry norms and client profiles.
Google Reviews came straight from Google’s business listings. Clutch reviews came from each agency’s Clutch profile. We averaged star ratings and counted the number of reviews to measure client satisfaction.
To find the top ranked international SEO agencies of 2025, we used SEMrush to grab each site’s average monthly traffic, Domain Authority (DA), total backlinks, and referring domains. These numbers show how visible and trusted each agency is online.
We compared service lists on company websites and cross-checked with third-party directories. That gave us a clear view of their core strengths—SEO, content, design, development, and more.
Industry Leading SEO Agency Profiles
1. WebFX | The Digital Marketing Agency That Drives Revenue
WebFX is a full-service digital marketing agency founded in 1996, renowned for its data-driven SEO strategies and transparent reporting. The company was established by William Lane Craig, who launched WebFX shortly after completing his studies at MIT.
For nearly three decades, WebFX has been delivering comprehensive digital marketing solutions to a diverse range of clients, consistently driving measurable results and long-term growth.
Key Information of WebFX:
- Company Location: Harrisburg, Pennsylvania, USA
- Minimum project size: $3,000 per engagement
- Avg. hourly rate: $100–$150/hr
- Focus area: technical SEO, enterprise SEO, content strategy, PPC, social media marketing, and other digital marketing-related projects.
- Employee Size:
- 501-1,000 employees
- 1,166 associated members
- Services provided:
- On-page,
- off-page SEO,
- Local SEO,
- Technical audits
- Content creation & marketing
- PPC management
- Web design & development
- Analytics & CRO
- Yearly Revenue ≈ $50 – $100 million (2024)
Google reviews: 4.5 ★ from 192+ reviews
Clutch reviews 4.9 ★ from 130+ client reviews
- Avg. monthly traffic ≈ 912.6K visits
- Domain Overview
- Domain Authority: 63
- Backlink:
- Referring domains: 60.1K+
- Total backlinks: 1.5 million
2. Intero Digital | Next Level Digital Marketing Agency
Intero Digital is a full-service digital marketing agency. They help businesses grow online using proven strategies and tools. Their team includes over 400 professionals across the U.S.
They offer services like SEO, PPC, Amazon marketing, web design, and more. Intero Digital also uses their own tools, like InteroBOT® and GRO™, to improve results.
Their focus is simple: help clients get real growth through clear, effective digital marketing.
Key Information of Intero Digital
- Company Location:
- Headquarters in Colorado Springs, CO, USA.
- Offices in San Diego, CA; Columbia, MO; Lewis Center, OH.
- Minimum project size: $1,000+ per engagement
- Avg. hourly rate: $100–$149/hr
- Focus area: Full-funnel SEO & PPC. Content marketing. AI-driven search (GRO™, InteroBOT®).
- Employee Size:
- 201-500 employees
- 279 associated members
- Services provided
- On-page & off-page SEO
- Technical SEO audits & fixes
- Content creation & digital PR
- PPC (Google Ads, Bing Ads, programmatic)
- Social media management & influencer marketing
- Web design, development & CRO
- UI/UX & graphic design
- Video production & Amazon marketing
- Yearly Revenue: Not publicly disclosed
- Google reviews: 4.86 ★ from 690+ reviews
- Clutch reviews: 4.9 ★ from 138 client reviews
- Avg. monthly traffic: ≈14.4 K visits/mo
- Domain Overview
- Domain Authority: 39
- Backlinks
- Referring domains: 3.6K
- Total backlinks: 141.3 K
3. SmartSites: #1 Best Rated Digital Marketing Agency
SmartSites builds growth-focused campaigns. They mix creative design with technical SEO. Clients range from startups to enterprises.
Key Information of SmartSites:
- Company Location: Paramus, New Jersey, USA.
- Minimum project size: No fixed pricing.
- Avg. hourly rate: Need to get a proposal
- Focus area: PPC, local & national SEO. E-commerce SEO. Web design.
- Employee Size:
- 201-500 employees
- 301 associated members
- Services provided
- On-page & off-page SEO
- Google Ads & social media ads
- Web design & development
- Conversion rate optimization
- Content marketing & copywriting
- Yearly ≈ Not publicly disclosed
- Google reviews: 4.9 ★ from 744 reviews.
- Clutch reviews: 4.9 ★ from 292 client reviews.
- Avg monthly traffic ≈ 20,000+/month.
- Domain Overview
- Domain Authority: 37.
- Age: 12 years.
- Backlinks
- Referring domains: 3,600+.
- Total backlinks: 212.2k+.
4. SEO Brand: Digital Marketing Agency
SEO Brand is a results-driven SEO agency with a focus on technical excellence. They help businesses dominate search rankings through tailored strategies. Their team combines deep SEO knowledge with creative content solutions.
Based in Florida, SEO Brand works with clients worldwide. They pride themselves on transparency and measurable outcomes.
Key Information of SEO Brand
- Company Location:
- Headquarters in Boca Raton, FL, USA.
- Additional offices in Miami, FL, and remote teams across North America.
- Minimum project size: 5,000/month Avg. hourly rate: $150–$250/hr
- Focus area: Technical SEO, enterprise SEO, content-driven link building, and local SEO.
- Employee Size:
- 51-200 employees
- 93 associated members.
- Services provided:
- Technical SEO audits & fixes
- On-page & off-page optimization
- Content strategy & creation
- Local SEO for multi-location businesses
- E-commerce SEO
- Link building & digital PR
- Competitor analysis & reporting
- Website migration support
- Yearly Revenue: Not publicly disclosed (estimated 25–50 million in 2025).
- Google reviews: 4.5 ★ from 15 reviews
Clutch reviews: 4.9 ★ from 92 client reviews
- Domain Overview:
- Domain Authority: 28
- Backlinks:
- Referring domains: 1.8k+
- Total backlinks: 36k+
5. HigherVisibility – #1 Digital Marketing Agency in USA
Higher Visibility is an award-winning SEO agency with a focus on driving organic growth. They’ve been a leader in the industry since 2003. Their team combines technical SEO expertise with creative content strategies to boost rankings and traffic.
Headquartered in Tennessee, Higher Visibility serves clients globally. They’re known for their white-glove service and tailored solutions for businesses.
Key Information of Higher Visibility
- Company Location:
- Headquarters in Memphis, TN, USA.
- Remote teams and satellite offices in key U.S. markets.
- Minimum project size: 5,000/month Avg. hourly rate: $150–$250/hr
- Focus area: Technical SEO, enterprise SEO, content marketing, and local SEO.
- Employee Size:
- 51-200 employees
- 85 associated members
- Services provided:
- Technical SEO audits & optimization
- On-page & off-page SEO
- Content strategy & creation
- Local SEO for multi-location businesses
- E-commerce SEO
- Link building & digital PR
- Competitor analysis & reporting
- Website migration support
- Yearly Revenue: Not publicly disclosed (estimated 30–60 million in 2025).
- Google reviews: 4.7 ★ from 147 reviews
Clutch reviews: 4.8 ★ from 80+ client reviews
- Domain Overview:
- Domain Authority: 42
- Backlinks:
- Referring domains: 9,000+
- Total backlinks:160.9+
6. Thrive Internet Marketing Agency: Digital Marketing Agency
Thrive Internet Marketing Agency is a full-service digital marketing partner. Since 2005, they’ve helped businesses grow through tailored SEO strategies and data-driven campaigns. Their team focuses on transparency, with regular updates and clear results.
Key Information of Thrive Internet Marketing Agency
- Company Location:
- Headquarters in Dallas, Texas, USA.
- Remote teams across North America and Europe.
- Minimum project size: $2,500+ per month (custom packages for enterprise clients).
- Avg. hourly rate: 150–200/hr (lower rates for long-term contracts).
- Focus area: Enterprise SEO, eCommerce optimization, and conversion rate optimization (CRO).
- Employee Size:
- 51-200 employees
- 202 associated members
- Services provided:
- Technical SEO & site audits
- Local & international SEO
- Content marketing & copywriting
- Paid search (Google Ads, Microsoft Ads)
- Social media marketing & management
- Web design & development
- Conversion rate optimization (CRO)
- Email marketing
- Yearly Revenue: Estimated $45 million+ (2025 projection).
- Google reviews: 4.1 ★ from 8 reviews.
- Clutch reviews: 4.6 ★ from 96 client reviews. Highlight: “Top-tier for complex SEO projects.”
- Domain Overview: Domain Authority: 46
- Backlinks:
- Referring domains: 16.6K
- Total backlinks: 777.8K
7. Coalition Technologies: SEO Company – #1 Rated in America
Coalition Technologies is a digital marketing agency focused on driving results through smart SEO and web design. Founded in 2009, they work with businesses of all sizes, from startups to global brands. Their team is known for combining creativity with data to boost rankings and revenue.
Key Information of Coalition Technologies
Company Location:
- Headquarters in Los Angeles, California, USA.
- Remote teams in the U.S., Europe, and Asia.
- Minimum project size: $1,000+ per month (flexible for small businesses).
- Avg. hourly rate: 100–150/hr (discounts for long-term plans).
- Focus areas: Technical SEO, eCommerce optimization, and custom web development.
- Employee Size ≈150–200 employees, including SEO experts, developers, and designers.
- Services provided:
- Technical SEO audits & fixes
- Local and international SEO
- E-commerce SEO (Shopify, WooCommerce)
- Web design & development
- PPC (Google Ads, Facebook Ads)
- Content marketing & copywriting
- Conversion rate optimization (CRO)
- Social media management
- Yearly Revenue: Not publicly disclosed.
- Google reviews: Couldn’t Find Verified Google Reviews
- Clutch reviews: 4.7 ★ from 147 client reviews. Highlight: “Affordable for startups but delivers enterprise-level quality.”
- Avg. monthly traffic: 360K visits/mo
- Domain Authority: 47
- Backlinks:
- Referring domains: 2.9K
- Total backlinks: 25.5K
8. SearchBloom – Search Engine Marketing Agency
SearchBloom is a data-driven SEO agency focused on delivering measurable results. They specialize in boosting organic traffic and rankings for businesses of all sizes. Their team combines technical SEO expertise with creative content strategies to drive growth.
Based in California, SearchBloom works with clients globally. They’re known for their transparent reporting and focus on ROI.
Key Information of SearchBloom
- Company Location:
- Headquarters in Irvine, CA, USA.
- Remote teams and satellite offices in key U.S. cities.
- Minimum project size: 5,000/month Avg. hourly rate: $150–$250/hr
- Focus area: Technical SEO, local SEO, enterprise SEO, and e-commerce optimization.
- Employee Size:
- 11-50 employees
- 32 associated members
- Services provided:
- Technical SEO audits & fixes
- On-page & off-page optimization
- Local SEO for multi-location businesses
- E-commerce SEO (Shopify, Magento)
- Content strategy & creation
- Competitor analysis & keyword research
- Link building & digital PR
- Analytics & performance tracking
- Yearly Revenue: Not publicly disclosed (estimated 15–35 million in 2025).
- Google reviews: 4.9 ★ from 68+ reviews
Clutch reviews: 4.9 ★ from 95+ client reviews
- Domain Authority: 29
- Backlinks:
- Referring domains: 2.3K+
- Total backlinks: 139.2K+
9. The SEO Works: Award-Winning UK SEO Company
The SEO Works is a UK-based agency with a reputation for driving organic growth. They help businesses rank higher and attract more customers through tailored SEO strategies. Their team combines technical expertise with creative content to deliver results.
Founded in 2004, The SEO Works serves clients across Europe and beyond. They’re known for their client-focused approach and clear communication.
Key Information of The SEO Works
- Company Location:
- Headquarters in Sheffield, UK.
- Remote teams and partners across Europe.
- Minimum project size: £3,000/month (approx. 3,700)
- Avg.hourlyrate: £100–£150/hr(approx.125–$185/hr)
- Focus area: Local SEO, enterprise SEO, technical SEO, and content marketing.
- Employee Size:
- 51-200 employees
- 99 associated members
- Services provided:
- Technical SEO audits & fixes
- On-page & off-page optimization
- Local SEO for multi-location businesses
- E-commerce SEO (Shopify, WooCommerce)
- Content strategy & creation
- PPC management
- Social media marketing
- Website design & development
- Yearly Revenue: Not publicly disclosed (estimated £10–£25 million in 2025).
- Google reviews: 4.9 ★ from 150+ reviews
Clutch reviews: 4.8 ★ from 90+ client reviews
- Domain Overview:
- Domain Authority: 22
- Backlinks:
- Referring domains: 5,200K
- Total backlinks: 678
10. OuterBox: Digital Marketing Agency | Results-Driven SEO
OuterBox is a full-service SEO and digital marketing agency with a focus on e-commerce growth. They help businesses optimize their online presence to drive sales and visibility. Their team combines technical SEO skills with creative design to deliver results.
Based in Ohio, OuterBox serves clients across North America. They’re known for their expertise in Shopify and WooCommerce optimization.
Key Information of OuterBox
- Company Location:
- Headquarters in Akron, OH, USA.
- Remote teams and partners nationwide.
- Minimum project size: 5,000/month
- Avg.hourlyrate: 150–$250/hr
- Focus area: E-commerce SEO, technical SEO, Shopify optimization, and local SEO.
- Employee Size:
- 201-500 employees
- 313 associated members
- Services provided:
- Technical SEO audits & fixes
- E-commerce SEO (Shopify, WooCommerce)
- On-page & off-page optimization
- PPC campaign management
- Web design & development
- Conversion rate optimization (CRO)
- Content marketing & digital PR
- Social media management
- Yearly Revenue: Not publicly disclosed (estimated 15–30 million in 2025).
- Google reviews: 4.9 ★ from 86+ reviews
- Clutch reviews: 4.7 ★ from 80+ client reviews
- Domain Overview:
- Domain Authority: 47
- Backlinks:
- Referring domains: 6.1+
- Total backlinks: 41K+
11. Delante: SEO & SEM Agency For Predictable Traffic Growth
Delante is a Poland-based SEO agency with a global client base. They specialize in technical SEO and content marketing to boost organic rankings. Their team focuses on data-driven strategies to help businesses grow online.
Founded in 2013, Delante has built a reputation for transparency and results. They work with startups, SMEs, and large enterprises across industries like e-commerce and SaaS.
Key Information of Delante
- Company Location:
- Headquarters in Wrocław, Poland.
- Remote teams and clients worldwide.
- Minimum project size: 2,500/month
- Avg.hourlyrate:80–$150/hr
- Focus area: Technical SEO, content marketing, e-commerce SEO, and link building.
- Employee Size: 50–150 employees (as of 2025).
- Services provided:
- Technical SEO audits & fixes
- On-page & off-page optimization
- Content strategy & creation
- Link building & digital PR
- E-commerce SEO (Shopify, Magento)
- Local SEO
- Competitor analysis
- Analytics & reporting
- Yearly Revenue: Not publicly disclosed (estimated 10–20 million in 2025).
- Google reviews: Couldn’t Find Verified Google Reviews
- DesignRush: 4.9 ★ from 50 Client Reviews
- Clutch reviews: 4.9 ★ from 145+ client reviews
- Domain Overview:
- Domain Authority: 37
- Backlinks:
- Referring domains: 3K+
- Total backlinks: 48K+
Comparative Analysis
Choosing the right agency can be tough. There are so many out there promising big results. That’s why we made this simple comparison chart—to help you see the facts at a glance.
We looked at 11 top-rated agencies and ranked them based on important details like Google reviews, Clutch reviews, website traffic, domain authority, and backlinks. These are things that show how trustworthy, popular, and skilled an agency really is.
This table will help you decide which company might be the best fit for your business. It’s not just about pretty websites—it’s about performance, reputation, and reach.
Take a moment to explore the chart below. It’s like a report card for each company for comparative analysis of top ranked 11 international SEO agencies.
| Ranking | Company Name | Google Reviews | Clutch Reviews | Avg Monthly Traffic | Domain Authority (DA) | Total Backlinks | Referring Domains |
| 1 | WebFX | 4.5 ★ from 192+ reviews | 4.9 ★ from 130+ reviews | ≈ 912.6K visits/mo | 63 | 1.5 million+ | 60.1K+ |
| 2 | Coalition Technologies | Not Available | 4.7 ★ from 147 reviews | ≈ 360K visits/mo | 47 | 25.5K | 2.9K |
| 3 | OuterBox | 4.9 ★ from 86+ reviews | 4.7 ★ from 80+ reviews | ≈ 60.1K visits/mo | 47 | 41K+ | 6.1K+ |
| 4 | Thrive Internet Marketing Agency | 4.1 ★ from 8 reviews | 4.6 ★ from 96 reviews | ≈ 203K visits/mo | 46 | 777.8K | 16.6K |
| 5 | Higher Visibility | 4.7 ★ from 147 reviews | 4.8 ★ from 80+ reviews | ≈ 30,000 visits/mo | 42 | 160.9K+ | 9,000+ |
| 6 | Intero Digital | 4.86 ★ from 690+ reviews | 4.9 ★ from 138 reviews | ≈ 14.4K visits/mo | 39 | 141.3K | 3.6K |
| 7 | SmartSites | 4.9 ★ from 744 reviews | 4.9 ★ from 292 reviews | ≈ 20,000 visits/mo | 37 | 212.2K+ | 3,600+ |
| 8 | Delante | Not Available | 4.9 ★ from 145+ reviews | ≈ 9.3K visits/mo | 37 | 48K+ | 3K+ |
| 9 | SearchBloom | 4.9 ★ from 68+ reviews | 4.9 ★ from 95+ reviews | ≈ 2,000 visits/mo | 29 | 139.2K+ | 2.3K+ |
| 10 | SEO Brand | 4.5 ★ from 15 reviews | 4.9 ★ from 92 reviews | ≈ 1.5K visits/mo | 28 | 36K+ | 1.8K+ |
| 11 | The SEO Works | 4.9 ★ from 150+ reviews | 4.8 ★ from 90+ reviews | ≈ 196 visits/mo | 22 | 678 | 5,200K |
Note:
- The ranking order was based on Domain Authority (DA), which was pulled from SEMRush data. Higher scores usually mean stronger websites.
- Google Reviews: Some companies (e.g., Coalition Technologies) do not have verified Google reviews.
- Backlinks: The total backlinks and referring domains are included for a comprehensive view of each company’s online authority.
Top Performers
WebFX takes the #1 spot with massive traffic (912K visits/month) and strong domain authority (DA 63). Their 1.5 million+ backlinks show they’re a trusted name. Coalition Technologies and OuterBox follow, with Coalition pulling ahead in traffic and OuterBox scoring perfect Google reviews (4.9★).
Traffic vs. Authority
Higher-ranked agencies don’t always have the most traffic. For example, Thrive Internet Marketing Agency (#4) has 203K monthly visits but a lower DA (46). Meanwhile, Intero Digital (#6) has fewer visits (14.4K) but shines with 690+ Google reviews (4.86★).
Review Standouts
Some smaller agencies punch above their weight. SmartSites (#7) and The SEO Works (#11) both have near-perfect reviews (4.9★) despite lower traffic. Delante (#8) also impresses with 4.9★ on Clutch but lacks Google reviews.
Backlinks & Trust
Backlinks show how trusted a company is. WebFX leads with 60K+ referring domains, while SEO Brand (#10) and The SEO Works lag here. SearchBloom (#9) has surprisingly high backlinks (139K+) but very low traffic (2K visits/month).
Cost-Effective Alternative & Professional SEO Agency – Upspell
Big agencies like WebFX or Intero Digital charge high fees. Not every business needs that. Startups or small businesses often prefer professional SEO services at lower costs. They will need results without breaking the bank. Upspell fills this gap. They offer top-tier services without the enterprise price tag.
A local bakery needing SEO might spend $300/month with Upspell instead of $5,000+ with larger agencies.
Why Upspell For Professional SEO Services?
Upspell is led by Mr. Amjad Shuvo. Since 2014, they’ve delivered quality SEO and digital marketing. Upspell stays off our ranked list to keep things fair. But they remain a top choice for startups and entrepreneurs. Here is why you should choose Upspell:
Our Professional Leadership Experts
Upspell’s team includes Google-certified SEO specialists. They live and breathe search algorithms. You get strategies built on real data, not guesswork, and guaranteed SERP Ranking.
Our Key Players ( Full Stack SEO Marketing Team)
All-In-One Digital Service (Industry We Serve)
SEO is just the start. Upspell also offers content writing, UI/UX design, web development, social media marketing, and PPC management. You won’t need multiple vendors.
Proven Track Record
Since 2010, Upspell has helped dozens of startups and small businesses improve traffic by 50–200 %. Their clients see higher rankings and more sales—all on modest budgets.
Transparent Pricing
No hidden fees. You know exactly what you’ll get Basic SEO plans start at $300/month. That beats most enterprise rates by 50 % or more.
Example Package: Basic SEO @ $300/month
- SEO audit
- On-page optimization
- Basic backlink strategy
- Technical SEO fixes
- Google My Business setup
- Keyword research
- SEO consultation and support
Rapid Turnaround
Need a landing page or a site tweak fast? Upspell’s in-house developers and designers can deliver custom and CMS-based sites in days, not weeks.
Dedicated Support
Email support is standard. You also get a single point of contact who knows your project inside out. Questions get answered within 24 hours.
Customized Solutions
Upspell doesn’t use one-size-fits-all templates. Every plan is tailored to your goals, audience, and industry. That means higher ROI and happier customers.
With Upspell, you gain a partner invested in your long-term success. They balance cost, quality, and speed—so your eCommerce business can grow without breaking the bank.
Final Thought
In this guide, we’ve explored the Top 11 International SEO Agencies of 2025. We saw big players like WebFX (912K visits/mo, DA 63) and scrappy teams like The SEO Works with near-perfect reviews. Big names often cost big money—and still offer no guarantees.
Mark learned that the hard way. He spent $10,000 and saw no gain. Upsell does things differently.
Upsell gives you expert SEO at half the price. Plans start at $300/month. You get custom strategies, not one-size-fits-all packages. Expect 50–200% traffic gains through smart SEO, content, and design.
You’ll see every cost up front. You’ll get fast fixes, new sites in days, and 24-hour support from a single point of contact. Upsell handles SEO, PPC, social media, and web development—all under one roof.
Your Next Step
Don’t bet your budget on pricey agencies that put big brands first. Choose Upsell for enterprise-level results at startup-friendly prices. Let’s grow your traffic—and your business—together.
