Search now includes AI-generated answers from tools such as Google AI Mode and ChatGPT Search, where people can get what they need without visiting your site.

For UK founders and early marketing leads, the real test is whether an agency can turn search visibility into qualified trials, demos and signups. 

This guide covers what to assess, how to match an agency to your stage and a shortlist of specialists worth comparing.

Key Takeaways

• Judge agencies on reporting tied to trials, demos and signups, not rankings alone.
• Prioritise foundations before product-market fit and execution capacity after it.
• Ask every agency how it measures AI search visibility and where that measurement falls short.
• Some SaaS specialists only work with established or Series A and later companies, so check fit early.
• Compare proposals on scope and ownership, not the headline fee.

How to choose: the core criteria

An agency should understand how buyers discover your product and what helps them take the next step. Look for evidence of these capabilities rather than a long list of services.

• SaaS funnel knowledge. Experience with free trials, product-led signups, help centres and documentation, not just blog traffic.
• Technical SEO for public pages. A plan for your marketing site and searchable documentation, covering page speed, structure and internal links. Private app pages usually don't need to appear in search.
• Buying-intent content. Pages for searches such as "alternatives to", "integrations with" and "best tool for", grounded in what your product actually does.
• Digital PR and link earning. Relevant coverage and links from credible sites, with a clear explanation of how they're earned.
• AI search capability. Generative engine optimisation (GEO) aims to improve visibility in AI-generated answers. Ask which platforms the agency tracks, how it measures mentions and what the limits of that measurement are.

Above all, ask for reporting that connects activity to trials, demos and signups. Rankings and traffic are useful signals, but they don't show whether you're attracting potential customers.

Match the agency to your stage

Before product-market fit, prioritise foundations over content volume. 

A usable site, a handful of pages that explain your product and a focused plan will usually do more than a large publishing programme while your positioning is still changing.

From Seed to Series A, many teams need a partner who can handle execution: writing, technical recommendations, outreach and reporting tied to sales opportunities. 

Check which tasks the agency owns and which still sit with your team.

If your product has thousands of templated pages, public documentation on a subdomain or a migration ahead, ask for examples of similar technical work. 

A 90-day pilot can show how an agency communicates and delivers, though it's usually too short to judge SEO's full commercial impact.

Agencies to consider: a starting shortlist

This shortlist is based on each agency's own published information. It isn't a ranking, so use it to spot possible matches, then check relevant client work, current scope and pricing.

1. MADX Digital

Best for: B2B SaaS teams that want SEO and AI search handled by one partner.

MADX pairs traditional SEO with a dedicated GEO service, alongside content strategy, digital PR and link building. 

It works primarily with B2B SaaS companies and frames its work around pipeline and revenue rather than traffic.

Founders comparing an SEO agency for SaaS startups with broader B2B specialists can use MADX Digital's own category-by-category breakdown, which sets its B2B SaaS SEO and GEO focus alongside startup specialists such as Embarque and technical firms such as iPullRank.

Worth knowing: It says clients get the most value when internal teams agree on growth metrics, so align on success measures early.

2. Rock The Rankings

Best for: Series A and later B2B SaaS teams tying search to booked demos.

Rock The Rankings focuses only on B2B SaaS SEO and GEO. Teams with in-house writers can buy strategy and senior review on its own, while others can hand over execution too.

Worth knowing: It says it isn't a fit before product-market fit, and most full-service engagements land at $10,000 or more a month.

3. Skale

Best for: SaaS teams with product-market fit that judge SEO by SQLs and recurring revenue.

Skale works with SaaS and tech brands and says it prioritises SQLs, qualified signups and new MRR over rankings. 

Its services include GEO, technical SEO, conversion optimisation and website migration support.

Worth knowing: Full implementation of its strategy is available at additional cost, so confirm what the core fee covers.

4. SimpleTiger

Best for: SaaS teams that want a packaged programme matched to their stage.

SimpleTiger works with SaaS and AI companies and bundles SEO with GEO and answer-engine optimisation. 

Its site covers growth stages from seed-funded startups through to enterprise.

Worth knowing: Its SEO packages start at 5% of revenue or funding at the stage each package targets.

5. Omniscient Digital

Best for: Established B2B software companies wanting a broad organic programme.

Omniscient Digital covers SEO strategy, GEO, content production, digital PR and CRO, with engagements scoped around pipeline. 

It focuses on established B2B software businesses rather than very early-stage teams.

Worth knowing: Full-service engagements start at $10,000 a month, and strategy packages start at $15,000.

6. Siege Media

Best for: SaaS teams wanting content, PR and AI citation work from one agency.

Siege Media's SaaS GEO service combines technical SEO, product-led content, AI citation strategy, digital PR and affiliate partnerships. It emphasises bottom-funnel content built around real buyer intent.

Worth knowing: It also works with fintech brands, so ask for SaaS examples close to your stage.

7. iPullRank

Best for: Platforms with complex technical SEO and AI search needs.

iPullRank focuses on technical SEO, relevance engineering and GEO. It structures engagements in three stages, with its Emerging stage aimed at startups and newer brands.

Worth knowing: Published investment ranges start at $30,000 for Emerging, $150,000 for Growth and $500,000+ for Elite.

Pricing and engagement patterns

Where the agencies above publish figures, they're quoted in US dollars from their own websites. Treat them as starting points rather than quotes, and confirm current rates directly.

Scope matters more than the headline fee. A strategy-only engagement isn't directly comparable with one that includes writing, outreach and technical implementation, so check which professional SEOservices each proposal actually covers.

Ask about deliverables, developer time, minimum terms and who owns the content and data. UK buyers should also confirm billing currency and any applicable taxes.

Red flags and ten quick questions

Pause before signing if you see:

• Vague "AI SEO" claims with no explanation of what's measured.
• Reporting that stops at sessions and rankings.
• Guarantees of rankings, traffic or leads.
• No technical assessment of the pages buyers need to find.
• Link-building tactics the agency won't explain.

Use these ten questions to make discovery calls more useful:

1. Who will do the work, and what relevant experience do they have?
2. What will you deliver in the first 90 days?
3. How will you measure organic search results and AI search visibility?
4. Who owns the content and data if we part ways?
5. How will you work with our developers?
6. Which pages for buyers close to a decision would you prioritise?
7. How do you earn links and mentions?
8. What timeline is realistic, and what could delay progress?
9. What results would make you recommend changing or stopping the work?
10. Can we speak to a current client at our stage?

How to run a fair selection

Give two or three agencies the same brief, including your goals, budget, site constraints and available developer time. Ask each to explain its first priorities, measurement approach and assumptions.

Compare the answers on clarity, relevant experience, scope and fit with your stage, not presentation polish. 

Look for honest explanations of trade-offs and dependencies.

A one-off plan or audit can show an agency's thinking before you commit to a retainer, provided the deliverables are useful on their own. 

Ask how each proposal would prioritise competitor, comparison and integration searches.

The right fit beats the label

There is no single best agency for every SaaS startup. Start with your goals, stage and internal capacity, then compare the shortlisted specialists against those needs.

Confirm prices and agree on ownership and reporting before you sign. Then choose a contract whose scope and review points you understand.

FAQ

When should a SaaS startup hire an SEO agency?

Usually once you have a clear product and a working sales motion. 

Before product-market fit, a focused plan and solid site foundations tend to matter more than an ongoing retainer, and some SaaS specialists won't take on pre-product-market-fit companies at all.

How much does a SaaS SEO agency cost?

Published figures vary widely. Among the agencies above, Omniscient Digital's full-service engagements start at $10,000 a month, 

SimpleTiger's SEO packages start at 5% of revenue or funding and iPullRank's Emerging stage starts at $30,000.

What is GEO, and do startups need it?

GEO aims to get your brand cited or recommended in AI-generated answers from tools such as ChatGPT and Google AI Overviews. 

It builds on sound technical SEO and content rather than replacing them, so treat it as part of the same programme.