Best SEO Agencies for Startups: 10 Options Compared

The best SEO agencies for startups aren't the ones that show up in every roundup with the same recycled Glassdoor blurbs. They're agencies you can actually verify: a real founding date, a real headquarters, published pricing where they've bothered to publish it, and clients they're willing to put their name next to. This guide profiles ten of them, from pure-play SaaS SEO specialists to full-funnel agencies that fold search into a bigger program, plus one option that isn't an SEO agency at all. Every fact below comes from the agency's own website. No invented scores, no borrowed case studies.

What makes an SEO agency a good fit for a funded startup

A good SEO agency for a startup is one that matches your stage, not just your industry. A ten-person Series A company with an in-house team of zero and a fifteen-month runway needs something very different from a Series C company scaling a content team it already built.

Most listicles skip this. They rank agencies the same way for a bootstrapped two-person team and a well-funded Series B, as if the only variable that matters is which agency has the biggest client logos. Your marketing goals at each stage look different too, which is worth sorting out before you shop for a vendor. This guide to setting marketing goals at Series A and B is a faster starting point than a sales call with any agency on this list.

The four questions that actually separate these agencies

Before you look at a single name, ask what you're actually buying. Four things separate the agencies below from each other far more than any ranking number would:

• Is SEO the whole engagement, or one line item? Some agencies here only do SEO and content. Others fold it into paid media, CRO, or a full growth stack.
• Do they publish pricing? Most agencies quote custom proposals after a discovery call. A few post real numbers. That tells you something about how they sell.
• Who are their named clients? An agency that lists Fortune 500 logos next to your Series A startup may not staff your account the way you'd hope.
• What do they actually mean by "startup"? Some of these agencies work with venture-backed software companies. Others use "startup" to mean any small business, including local shops and ecommerce brands.

Keep those four questions in mind as you read the profiles below. They matter more than any star rating. And if you're not even sure SEO is the right channel yet versus a broader go-to-market push, this list of the best go-to-market agencies for startups is worth reading before this one.

Ten SEO agencies worth your time, and what each one actually does

These aren't ranked first to worst. They're ordered roughly from smaller, startup-focused engagements to larger, enterprise-leaning ones, with one non-SEO-agency option at the end. Read the "best for" line first. It'll save you a discovery call.

Kalungi

Best for: the earliest-stage B2B SaaS founder who wants SEO bundled with brand, web, and paid media instead of hiring separately for each.

Kalungi is headquartered in Kirkland, Washington, and says it has supported more than 150 B2B SaaS teams across more than 20 industries, from fintech to edtech source. Its site lists seven core services, including ABM, HubSpot and RevOps setup, branding and design, paid media, content and SEO, and web development, positioned as a full "marketing OS" rather than a standalone SEO retainer. Kalungi doesn't publish specific client names or pricing on its about page.

Grow and Convert

Best for: lean teams that want content built to convert existing traffic instead of chasing traffic volume.

Grow and Convert describes its founders meeting at a marketing dinner in San Francisco in 2015 and buying the domain that same week source. The agency calls itself "a content-focused SEO and GEO agency" built around conversion-focused organic growth rather than raw traffic, and serves B2B, B2C, SaaS, and service businesses. Case studies on its site name Smartlook, Brandfolder, RainforestQA, Patreon, and Crazy Egg. No pricing is published. If you want the fundamentals of content marketing before you talk to any content-first agency, this complete guide to content marketing covers the ground Grow and Convert builds on.

Rock The Rankings

Best for: a startup that wants a pure-play, technical B2B SaaS SEO specialist with pricing already on the table.

Rock The Rankings says it has run for more than 8 years serving over 300 B2B SaaS companies across healthtech, fintech, martech, and HR tech, without taking a single ecommerce or local client source. Its site names Toast, Bizzabo, Keragon, Balto, and MoonPay as clients, and publishes actual pricing: an AI Search Sprint at $15,000 one time, Strategy and Consulting from $5,000 a month, and Done-for-You work from $8,500 a month, with most engagements landing at $10,000 or more.

Single Grain

Best for: a venture-backed startup that wants SEO run alongside paid media and performance creative, not as a standalone service.

Single Grain is headquartered in Miami and describes itself on its own site as founded in 2014, calling itself "a revenue-focused digital marketing agency that helps venture backed startups to Fortune 500 companies grow their revenues online" source. Its services list includes programmatic SEO, AI-assisted content marketing, organic social, and performance creative. The site names Amazon, Uber, Salesforce, and Airbnb as companies it has worked with, alongside client testimonials from Lever.co and Nextiva. Single Grain doesn't publish service pricing, only an educational page explaining how agency pricing models work.

Omniscient Digital

Best for: a mid-market B2B software company that wants a dedicated, content-led organic growth team and has the budget to match.

Omniscient Digital calls itself an "organic growth agency for B2B software companies," with offices in Austin, New York, San Francisco, Chicago, and Boston source. Its named clients include Jasper, Order.co, GatherContent, Smartling, and 360Learning. Of everyone in this list, Omniscient is the most direct about cost: its site states that full-service engagements start at $10,000 a month, which puts it out of reach for a lot of Series A budgets.

Directive Consulting

Best for: a B2B tech company that wants SEO folded into a full-funnel program with paid media and RevOps, not bought on its own.

Directive says it has been "solving tough challenges for ambitious B2B businesses since 2013," with a home base in Orange County and additional offices in Austin, New York, Mexico City, London, and Toronto source. It serves technology, industrial, and services companies, and its site displays logos for Amazon, Uber Freight, Snap, Calendly, Adobe, Cisco, and ZoomInfo. Directive doesn't publish pricing, and given the size of the client logos on its homepage, a lean startup account may not get top priority.

NoGood

Best for: a startup that wants SEO treated as one channel inside a bigger growth marketing team, not a standalone SEO contract.

NoGood is based in Soho, New York, with additional offices in Miami and Dubai source. Its service list runs well past SEO, into AEO, paid search, organic social, CRO, marketing analytics, and fractional CMO work, across SaaS, healthcare, fintech, and consumer industries. Its site displays logos for Nike, TikTok, MongoDB, Intuit, and Citi. No pricing is published, and those client logos suggest a brand roster built for bigger budgets than most seed or Series A rounds carry.

Siege Media

Best for: a team that wants heavy link building and digital PR doing the work behind its content, not just content production.

Siege Media is headquartered in San Diego and describes its focus as helping "brands drive visibility on and off LLMs," spanning SaaS, fintech, ecommerce, health, travel, education, and cybersecurity clients source. It names TransUnion, Chime, Zillow, Airbnb, HubSpot, Zapier, Asana, and Zendesk as clients. Siege doesn't publish pricing, and it isn't a startup-only shop. Its client roster leans toward companies well past the Series A stage.

Foundation

Best for: a later-stage or enterprise B2B SaaS company that wants content built for both classic search and AI-answer visibility, and has the budget for it.

Foundation, based in Philadelphia, says on its own site that it has operated "since 2014," combining B2B research and distribution as an "AI visibility agency" for B2B tech and SaaS companies source. Its named clients include Bitly, Paychex, Mailchimp, Canva, Procore, and Snowflake. That client list, alongside its senior-operator positioning, points to an agency built more for a company with an established marketing function than for a founder without one yet.

The Zulu Method

Best for: a funded B2B startup that would rather skip hiring an in-house team altogether, and wants SEO run as one channel inside a full program instead of a standalone vendor relationship.

The Zulu Method isn't a pure SEO shop, and it doesn't pretend to be. It's built to replace hiring an in-house team permanently for funded B2B startups, running 10+ channels including SEO and AI search under one plan, from content and technical SEO to paid media, lifecycle, and answer-engine optimization. Plans start at $9,995 a month, and the Zulu Pilot runs $4,995 as a lower-commitment starting point, aimed at getting you live in under 30 days and into pipeline by day 60. If you want a specialist SEO vendor to add to a stack you already run, that's not this. If you want the whole stack run for you, it's worth a look.

Compare the ten agencies side by side

Here's the same information in one table, so you can compare pricing models and minimum commitments without rereading nine profiles.

Where most "best SEO agency" lists fall short

Most posts ranking SEO agencies for startups stop at the names. Powered by Search's list of the best SEO agencies for startups and SaaS companies, for example, profiles 10 agencies without pricing or named clients for any of them source. That's the gap this guide fills: every entry below carries what the agency itself publishes about price, clients and focus, so you can shortlist without a discovery call.

What it does include instead is Glassdoor-style commentary on each agency's internal culture: whether staff feel supported, whether pay is competitive, whether a recent merger caused uncertainty. That's useful if you're applying for a job there. It tells you almost nothing about whether the agency will grow your organic pipeline.

A ranked list where the agency writing it puts itself at number one isn't a neutral comparison. It's marketing with a numbered list format. That's exactly why every agency profile above sticks to facts you can verify on the agency's own site: founding year, headquarters, named clients, and pricing where it exists. No ranking number, no borrowed review score.

How to evaluate an SEO agency as a Series A or B founder

Evaluating an SEO agency at Series A or B comes down to three things: fit with your stage, clarity on what you're actually buying, and proof they've done this for a company like yours. Skip the agency's homepage testimonials and go straight to these.

Match the agency to your stage and budget

A company two years past its Series A with an established content function needs a different agency than a company three months past its seed round with no marketing hire yet. If an agency's published client roster is all household names, ask directly how a startup account gets staffed. Don't assume you'll get the same senior team pictured on their homepage.

If you're still figuring out how much to spend in the first place, a benchmark for what agencies actually charge is a faster starting point than a sales call.

Ask what you're actually buying

"SEO agency" means different things to different shops. Some sell content production. Some sell technical audits and link building. Some sell a full program with paid media and CRO folded in. Ask for a sample deliverable, not a slide deck, before you sign anything.

Also ask what happens to your content and your search rankings if you leave. Some agencies build assets you keep. Others build a dependency you can't easily unwind.

Check whether they've done this for a company like yours

A named client list matters more than a client count. If an agency's site names a client in your exact category, B2B SaaS, developer tools, fintech, ask to talk to whoever ran that account, not just the sales rep who took your first call.

If you're weighing an SEO agency against other options entirely, like the best fractional CMO agencies for SaaS companies or a broader outsourced marketing setup, this breakdown of when a marketing agency is actually worth it is a useful gut check before you commit budget either way. And if you're deciding between hiring a marketing consultant and signing an agency contract at all, this comparison of a marketing consultant versus an agency is worth reading first.

What SEO costs at each stage, and what you actually get for it

SEO pricing for startups splits into two camps: agencies that quote a custom number after a sales call, and the small handful that publish a starting price. Of the ten agencies in this guide, only Omniscient Digital, Rock The Rankings, and The Zulu Method disclose pricing on their own sites.

Omniscient Digital's full-service engagements start at $10,000 a month, aimed at B2B software companies that already have budget allocated for organic growth as its own line item. Rock The Rankings publishes a range from $5,000 a month for strategy and consulting up to $8,500 a month for done-for-you work, with a $15,000 one-time AI Search Sprint for a faster entry point.

The Zulu Method's plans start at $9,995 a month, but that isn't a price for SEO alone. It covers SEO plus 10+ other channels under the same plan, which changes the comparison. A $10,000 SEO-only retainer and a $9,995 plan covering SEO, paid, content, and AI search aren't the same purchase, even if the number looks similar.

If none of that fits your current budget, the honest move is to get clear on what you can actually spend before you take a sales call. Comparing your numbers against B2B SaaS CAC benchmarks will tell you faster than an agency's pricing page whether SEO spend at this level makes sense yet.

Frequently asked questions

What's the difference between an SEO agency and a full-service marketing agency for a startup?

An SEO agency, like most of the names in this guide, focuses on search rankings, content, and technical fixes. A full-service agency runs SEO alongside paid media, lifecycle, and sometimes brand and web work under one contract. If you're a startup with no marketing hire yet, a full-service setup often means fewer vendors to manage, though it also means less specialization in any single channel.

How much should a Series A startup budget for SEO?

Of the agencies here that publish pricing, the range runs from $5,000 a month to $10,000 a month for SEO alone. That's before content production, link building add-ons, or a broader program. Comparing that against what outsourced marketing costs overall will tell you whether SEO deserves that share of your budget right now, or whether another channel should come first.

How long does SEO take to show results for a B2B SaaS startup?

None of the agencies in this guide publish a specific timeline on their own sites, and you should be skeptical of anyone who promises one without knowing your domain history and competitive set first. This guide to how long SaaS SEO actually takes walks through what shapes that timeline before you sign a contract based on a number someone gave you on a sales call.

Should a startup hire an SEO agency or make its first marketing hire?

It depends on whether you need one channel run well or a person who can own strategy across every channel. An SEO agency solves the first problem. A first marketing hire, or a team that replaces one, solves the second. This comparison of a first marketing hire versus an agency breaks down the tradeoff in more detail than a single blog post on SEO agencies can.

What's a red flag when evaluating an SEO agency?

An agency that won't name a single current client, won't disclose its minimum engagement length, or promises a specific ranking position by a specific date. Search algorithms don't work that way, and any agency that tells you otherwise is selling confidence, not a plan.

Does AI search, like ChatGPT and Perplexity, change how I should pick an SEO agency?

It changes what you should ask about. Several agencies in this guide, including Foundation and Rock The Rankings, now explicitly sell AI-visibility or "GEO" work alongside classic SEO. If you care about showing up in AI-generated answers, not just Google's results page, ask any agency you're evaluating how their work changes for that surface specifically, rather than assuming traditional SEO tactics carry over. This guide to SEO and GEO optimization covers what's actually different.

Is The Zulu Method an SEO agency?

No. The Zulu Method is an AI-native marketing agency built to replace an in-house marketing team for funded B2B startups, running SEO as one of 10+ channels rather than as a standalone service. If you want a vendor that only does SEO, one of the other nine agencies here is a better fit. If you want the whole function run for you, the Zulu Pilot is a lower-commitment way to test that before a full plan.

Your next move

Pick two or three agencies from this list whose "best for" line actually matches your stage and budget, and get on a call with each. Ask the questions above before you ask about price. The answers will tell you more than any ranking would.

If what you actually want is to stop managing separate vendors for SEO, paid, content, and everything else, that's a different conversation. Talk to The Zulu Method about what running your marketing as one program, instead of a stack of agencies, would look like for your stage.

Hannon Brett

Founder, The Zulu Method

5x CMO/VP | 4x Founder | 20+ Years Building B2B Growth GTMs | AI-Native GTM Pioneer Proving AI Replaces 80% of Marketing Execution | B2B Events Growth Expert | Leadership, Superstar Team Building, & Successful Customers.