Quick answer: Pick the agency that fits your store’s biggest gap. OuterBox suits large catalogs and full-service needs, NOVOS suits DTC and Shopify brands, Inflow suits migrations and technical cleanup, Siege Media suits content-led growth and AI search, and Outreach Monks suits managed SEO with link building. No agency can guarantee rankings.
Ecommerce SEO is harder than regular SEO. A store can have thousands of product pages and filters, plus variants and seasonal lines, and they all change often. Generalist agencies often miss problems like faceted navigation, duplicate variants, and discontinued products.
This list is ordered by how well each agency fits a store, not by size.
Outreach Monks publishes this post and is one of the five agencies. Every other agency’s details come from its own site or a public profile. We did not run a paid engagement with any of them. Where a price isn’t published, we say so.
How We Compared
We looked at five things: how focused each agency is on ecommerce, its platform and technical depth, proof of results, pricing openness, and reporting. Results on agency sites are their own claims.
The Five at a Glance
1. Outreach Monks
Best for: Stores that want SEO and links from one team
Outreach Monks runs managed SEO, guest posting, niche edits, and brand mentions. It also covers AI search visibility, and works in restricted niches such as cannabis and vape.
Link building is also sold on its own through link building packages. See our ecommerce link building page and case studies for examples.
2. OuterBox
Best for: Large catalogs that need SEO, ads, and web design under one roof
OuterBox lists SEO, AI SEO, paid media, and web design. It names Shopify, BigCommerce, Magento and WooCommerce as platforms. It claims over 1,000 clients served and a 4.8 out of 5 average from 867 reviews.
Its site gives different team sizes (250+ and 300+ staff), so ask for the number on your account team.
3. NOVOS
Best for: DTC and Shopify brands
NOVOS was founded in 2018 and has about 40 employees. It focuses on organic SEO for ecommerce retail brands. Named clients include Adidas and Osprey. It also launched a PR and SEO relevancy tool in 2025.
4. Inflow
Best for: Site migrations and technical cleanup
Inflow says it has helped businesses migrate sites for more than 15 years, and it lists technical audits, content, link building, PPC, and GA4 and Tag Manager audits. It holds Google Premier Partner and Microsoft Ads Partner status. One case study cites a 118% month-over-month rise in organic revenue for Quality Woven Labels (company-reported).
It says organic traffic can fluctuate for weeks after a migration and usually recovers within a few months.
5. Siege Media
Best for: Content-led growth and AI search
Siege Media lists GEO, content, digital PR, and research reports. Named clients include Airbnb and Zendesk. It reports $148.6M in yearly client traffic value (company-reported).
Ecommerce Agency or Generalist?
Technical fixes and authority work are different jobs. Some agencies do both, others split them. Learn the difference between on-page and off-page SEO before you hire.
What Ecommerce SEO Costs
These are our estimates, not quotes. Be wary of low retainers with no itemized deliverables. Ask how much of the fee goes to actual link placements.
How Long It Takes
Treat these as typical ranges, not promises.
How to Check an Agency’s Case Studies
- Ask for the starting number, not just the percentage.
- Ask for real figures and a date range.
- Separate branded from non-branded growth.
- Spot-check the client in a third-party tool.
- Ask for a case study in your category and size.
Contracts and Ownership
Six to twelve months is a typical minimum, ideally with a review point. Ask for revenue-linked reports and a live dashboard. Get asset ownership in writing, plus a handover plan if you leave.
Earned links stay when you stop paying. Paid recurring links don’t. Learn the difference between natural and unnatural backlinks, and watch for link decay.
How to Choose
If you need help with content planning, start with a topical map. As zero-click searches grow, product pages also need clear trust signals. See how to build trust on your ecommerce site.
Questions to Ask Before You Hire
- Can you show case studies for a store like mine, with starting numbers?
- How do you decide which filter pages get indexed?
- How do you handle variants and duplicate content?
- Who works on my account day to day?
- How do you build links, and who does it?
- What does the monthly report cover?
- What is the minimum term, and what happens if results are flat at month four?
Red Flags
- Guaranteed rankings. Google itself says “No one can guarantee a #1 ranking on Google.” See its guide to hiring an SEO.
- Vague or bulk link building
- No ecommerce case studies
- Keyword-only reporting
- No named contact
- Pressure to sign a long contract
Final Thoughts
No single agency wins for every store. Name your bottleneck first, whether that is technical debt, thin content, or low authority, then test agencies against it.
If authority and a managed plan are the gap, start with our SEO packages. Agencies can also use our white-label delivery or become an SEO reseller partner.
Frequently Asked Questions
What is an ecommerce SEO agency?
A firm that improves how online stores rank, covering technical fixes, product and category pages, content and links.
How much does ecommerce SEO cost?
Small stores often spend $1,000–$3,000 a month. Mid-market programs run $3,000–$8,000. These are our estimates.
How is ecommerce SEO different from regular SEO?
Stores have huge page counts and variants that create duplicate content and crawl problems.
How long until I see results?
Technical fixes can show first signs in weeks. Link building and content often take six months or more.
Which agency is best for Shopify?
NOVOS focuses on ecommerce brands, and OuterBox lists Shopify among its platforms. Check experience on your exact setup.
Can an agency guarantee rankings?
No. Be wary of anyone who does.
Agency or in-house?
An agency fits when you need several skills at once. In-house fits when SEO is a full-time job.
Do I need a separate link building agency?
Not always. Some agencies do both. If yours doesn't, ask how it handles ecommerce link building.
Technical SEO or link building first?
Fix technical issues first. Links to a broken site waste value. If you also want to sell through marketplaces, our guide to Etsy SEO may help.
