7 Top SEO Agencies for Startups in London (Pricing, Fit and Who Each Is Not For)
Last verified: 28 September 2026. Pricing and positioning were checked against each agency's own website on this date.
Disclosure: Ryesing is one of the agencies on this list, so we have an obvious bias. We've listed ourselves first for transparency, not because we think we're the best fit for everyone. Each entry includes who the agency is not for, including us. No agency paid to be listed.
Most lists of SEO agencies in London are built for brands like Puma and Currys, not for a seed-stage SaaS company with a small team and a budget that has to justify itself. If you're comparing SEO agencies for startups in London, you need three things those lists rarely give you: honest pricing, a clear view of which stage each agency suits, and a straight answer on who each one is wrong for. That's what this list is built around.
How we chose these seven
We started from the agencies that show up repeatedly in London SEO roundups and SaaS-specific lists, then applied five filters:
London base confirmed on the agency's own website. Several agencies were described as London-based in one ranking and elsewhere in another, so we dropped anyone we couldn't confirm.
Explicit startup or scale-up fit. Stage, ARR range or budget guidance on their own site.
SEO is a core service, not an add-on to paid media.
A view on AI search (GEO/AEO), because buyers now research in ChatGPT and Google's AI features as well as classic search.
Pricing we could source. Where an agency doesn't publish prices, we say so rather than repeat unverified third-party numbers as fact.
The list is grouped by who each agency suits. It's not a ranking. Case-study numbers you'll see linked from agency sites are self-reported, so treat them as a starting point for questions, not proof.
At a glance
Agency | Best for | Stage fit | Starting price | Price source |
Ryesing | SEO, AEO and GEO inside a wider growth programme | Seed to Series B SaaS and B2B | From £1,499. per month | |
Passion Digital | Flexible, lower-entry B2B SEO with a GEO service | Startups to established brands | From £2,000 per month | Self-reported in its own agency roundup |
MADX Digital | Focused SaaS SEO, link building and GEO, priced by pillar | SaaS and tech, small roster | From around $2,500 per month per pillar (USD, ex VAT), 6-month initial term | Published pricing page |
Team 4 | Pipeline-first B2B SaaS SEO | Seed to £20m+ ARR | From £3,000 per month | Published on its site |
Found | Search across Google, YouTube, TikTok and Amazon | Consumer and established brands with £4k+ budgets | Bespoke projects from £3,000; retainers typically £4,000-£12,000 per month | Published on its site |
Gripped | SEO inside full-funnel demand gen for SaaS | Typically £2M-£50M ARR | Not published (third-party estimates range roughly £5,000-£15,000 per month) | Estimates only |
Omnius | High-volume, content-led SEO and GEO for SaaS and fintech | SaaS, fintech and AI companies | Not published | n/a |
1. Ryesing: best for SEO that sits inside a wider growth programme
Ryesing is a UK growth marketing agency for SaaS and B2B startups, working from Seed through Series B. Its content is built to rank, answer questions and get cited, which covers SEO, AEO and GEO, and the content team works alongside technical specialists rather than treating SEO as a separate silo. The model pairs senior people with AI-enabled workflows.
Best for: Startups that want organic search tied to content, lead generation and go-to-market, not a standalone SEO retainer.
Not for: e.g. teams that only want digital PR and link building, or enterprise technical SEO such as large multi-market migrations.
Price: Starts £1,499.
Proof: : neat: A fintech business bank account with a difference. 25+ currencies. 150+ countries. All in one card with up to 3% cash back on online spend.
If SEO is one piece of a bigger job (positioning, a content engine, B2B lead generation), that's where we're strongest. Our content marketing service is where most SEO engagements start.
2. Passion Digital: best for a flexible, lower-entry retainer
Passion Digital is a London digital agency with B2B SEO and a dedicated AI search offer covering GEO, AI Overviews optimisation and LLM tracking. In its own agency roundup it lists flexible retainers and bespoke projects from £2,000. It was acquired by US AI firm Pixis.ai, which it says has strengthened its tooling.
Best for: Startups that want a lower entry point and a team with a named GEO service.
Not for: Teams that need deep SaaS-only specialism. Its client list leans towards established brands such as Knight Frank and Mazda.
Ask about: How the Pixis.ai acquisition affects your account team and pricing.
3. MADX Digital: best for focused SaaS SEO bought by the pillar
MADX Digital is a London-based search agency, founded in 2021, that focuses on SaaS, fintech and tech and leads with AI search across its plans. Its pricing is public: plans are built around pillars (SEO, content and authority) that you stack, quoted in USD ex VAT, with a six-month initial term then rolling monthly. It says it works with up to 20 clients at a time.
Best for: SaaS startups that know what they need and want to buy SEO, content and links separately, with transparent reporting.
Not for: Companies that want SEO bundled into paid media, brand and demand generation. It's a search specialist.
Ask about: Whether the six-month term suits your runway.
4. Team 4: best for pipeline-first B2B SaaS SEO
Team 4 is a London B2B SaaS SEO agency that starts from the bottom of the funnel (comparison, alternatives and use-case pages first, awareness content later). Its SEO typically starts at £3,000 per month, it says it works with teams from seed to £20m+ ARR, and it has been a finalist at the UK and European Search Awards. It also builds Webflow sites with search built in.
Team 4 is unusually direct about fit. By its own account it's probably not right if you want guaranteed results, if you're pre-product or don't yet have a clear ICP, or if you want a big-agency org chart.
Best for: Scaling B2B SaaS teams spending £3,000+ a month on marketing who want organic that compounds and reports against pipeline.
Not for: Pre-product startups and anyone who wants a pair of hands rather than a partner that pushes back.
5. Found: best for consumer brands that need search beyond Google
Found is a London digital performance agency built around its "Everysearch" approach, which treats YouTube, TikTok and Amazon as search platforms alongside Google. On its own site, bespoke SEO projects typically start at £3,000 and retainers usually run £4,000-£12,000 per month.
Best for: Consumer, marketplace or retail-style startups with a £4,000+ monthly budget and customers who search on several platforms.
Not for: Early-stage B2B SaaS that needs low-volume, high-intent depth on a small budget. (That's our read, based on its positioning and client mix.)
6. Gripped: best when SEO is one lever in full-funnel demand generation
Gripped is a London agency founded in 2017 that works only with SaaS, AI and tech companies, typically between £2M and £50M ARR. SEO and GEO sit inside a wider programme of demand generation, paid media and web work, run in 30-day sprints with reporting tied to pipeline. It doesn't publish prices; third-party estimates vary widely, so ask for a proposal rather than relying on a number you've read.
Best for: SaaS companies past roughly £2M ARR that want SEO integrated with paid and sales alignment.
Not for: Pre-£2M ARR startups, or anyone who wants SEO on its own.
7. Omnius: best for high-volume, content-led SEO and GEO in SaaS and fintech
Omnius is a London-based B2B SEO and GEO agency that works only with SaaS, fintech and AI companies. It leans on content velocity, programmatic SEO and its own AI-visibility tracking, and says it avoids AI-written content and focuses on bottom-of-funnel buyers. Its listed case studies include TextCortex and ANNA Money (self-reported). It doesn't publish pricing.
Best for: Funded SaaS, fintech and AI companies that want a lot of high-intent content and a proprietary approach to AI search visibility.
Not for: Tightly budgeted seed-stage teams, or anyone outside its three sectors.
Ask about: Pricing up front, and which of the listed case studies were delivered from its London team.
What should a London startup expect to pay?
From the prices these agencies publish or state themselves, entry points sit at roughly £2,000-£3,000 per month, with mid-tier retainers running £4,000-£12,000. Anything above that is typically integrated demand generation or enterprise work.
A practical rule of thumb from us (not a published benchmark): if you can't commit around £2,000-£3,000 a month for at least six months, a strong freelancer or fractional hire will usually serve you better than an agency. Also compare retainers by deliverables, not headline price. Ask how many pieces of content, technical fixes and links each tier includes, and who writes them.
How long until SEO pays off?
Ignore any agency that promises a date. Two of the agencies above publish their own guidance, and it's consistent: Team 4 says meaningful movement in rankings and traffic typically takes 3 to 6 months, with commercial impact such as demos and pipeline following at 6 to 9 months. Omnius similarly cites 3 to 6 months for improvements. Use that as a benchmark when you set a review point.
How to vet an SEO agency (a 9-point checklist)
Check it's a real company. Search the registered name on Companies House and confirm the address, incorporation date and filing history.
Ask who does the work. Pitch teams and delivery teams often differ. Ask to meet the person who'll run your account.
Ask for reporting that maps to pipeline. Demos, sign-ups and organic-sourced opportunities, not impressions.
Ask for two references from your stage and sector, and speak to them.
Check the contract. Minimum term, notice period, who owns the content and the accounts and tools, and what happens to links and content if you leave.
Be sceptical of guarantees. Nobody controls Google. A guaranteed ranking or lead number is a warning sign.
Test their GEO claims. Google's own documentation says there are no additional requirements to appear in AI Overviews or AI Mode beyond good SEO fundamentals. A credible GEO vendor should explain what they do beyond that, such as earning mentions and citations in the sources tools like ChatGPT and Perplexity draw on, and how they measure it.
Ask what they'll tell you not to do. Good agencies push back on the wrong keywords and premature spend.
Ask how they use AI. Who reviews the output, and what's the process for accuracy and originality?
If you'd like a second opinion on a proposal, we're happy to look at it. It costs nothing, and we'll tell you if we think another agency on this list is a better fit. Our guides to choosing an inbound marketing agency and the best growth marketing agencies in the UK cover the wider buying process.
Before you hire anyone: fix these first
An agency can't rescue a startup that hasn't answered basic questions. You'll get far more from any agency above if you have a clear ICP and buyer persona (our B2B SaaS buyer persona guide is a good place to start), a go-to-market plan (our GTM guide for UK startups), and conversion tracking that shows what organic actually delivers.
FAQ
How much does an SEO agency cost for a startup in London?
Published entry points among specialist agencies start at roughly £2,000-£3,000 per month, with mid-tier retainers running from about £4,000 to £12,000. Prices depend on scope, so compare deliverables, not just the monthly figure.
How long does SEO take to work for a startup?
Agencies that publish guidance typically cite 3 to 6 months for movement in rankings and traffic, and 6 to 9 months for pipeline impact. Competitive terms and new domains take longer.
Should an early-stage startup hire an SEO agency or a freelancer?
If you can commit roughly £2,000-£3,000 a month for six months or more, an agency gives you a team and process. Below that, a strong freelancer or fractional hire is usually better value. This is our judgement rather than an industry benchmark.
Do I need a separate GEO or AI search agency?
Usually not. Google says appearing in its AI features needs no special optimisation beyond SEO fundamentals. Being cited in other AI tools involves earning mentions across the web, and many SEO agencies now cover that. Ask any vendor exactly what they'd do and how they measure it.
What's the difference between a specialist SaaS SEO agency and a generalist London agency?
Specialists such as Team 4, MADX Digital, Gripped and Omnius understand long sales cycles, low-volume high-intent keywords and pipeline reporting. Generalists may offer broader services but often apply consumer-style tactics that chase traffic over demos.
How do I check an SEO agency is legitimate?
Verify the company on Companies House, ask for references at your stage, read the contract for term and ownership, and be wary of guarantees. The checklist above covers nine checks.
Conclusion: Top SEO Agencies for Startups in London
The best SEO agencies for startups in London aren't the biggest names on the directory sites. They're the ones whose stage, budget and specialism match yours, and who will tell you plainly when they're not the right fit. Use the entries above to shortlist two or three, run the vetting checklist, and ask each for a proposal you can compare like for like.
If SEO is part of a bigger growth problem, talk to Ryesing and we'll tell you honestly whether we're the right fit, or point you to someone on this list who is.
Something out of date or wrong? Tell us at Ryesing and we'll correct it. We re-verify this list quarterly.