Best AI SEO Agencies for LLM Citations
Best UK AI SEO agencies for earning citations across large language models. Specialists who measure LLM mention share across ChatGPT, Claude, Gemini, and Perplexity.
LLM citation work is the most measurable form of AI SEO. Instead of vanity metrics, you track whether your brand or content is cited when users ask the underlying questions across ChatGPT, Claude, Gemini, Perplexity, and AI Overviews. The agencies below all have proprietary tracking for cross-platform citations and treat citation share, not ranking, as the core success metric. Rank4AI and Found have the most developed cross-platform measurement.
SEOCompare is the UK's independent comparison of AI search optimisation agencies and tools, helping businesses find the right partner for ChatGPT, Gemini, Perplexity, and AI Overviews visibility.
UK AI SEO Agencies Compared
LLM citation-focused retainers on this page run from £1,500 a month (CarrieAnn Sudlow) to £4,000 a month (Found). Most engagements settle at £2,500 to £3,000. Most engagements settle at £2,500 to £3,000.
| # | Agency | HQ | Best For | Pricing |
|---|---|---|---|---|
| 1 | Found | London, UK | Mid-market and enterprise brands wanting full-service SEO + AI search under one roof | From £4,000/mo |
| 2 | ClickSlice | London, UK | UK businesses wanting full AI search platform coverage at SME pricing | From £2,500/mo |
| 3 | Charle | London, UK | Shopify and ecommerce brands wanting AI search + technical SEO together | From £3,000/mo |
| 4 | CarrieAnn Sudlow | Manchester, UK | Founder-led SaaS and B2B brands wanting hands-on consultant access | From £1,500/mo |
Detailed Agency Profiles
Found
Found is a London-based agency, founded in 2005, with a team of 100+, covering AI SEO, GEO, AEO, PPC, across retail, b2b, travel. Mid-market and enterprise brands wanting full-service SEO + AI search under one roof. Proprietary tooling: Everysearch / Luminr. Watch-out: premium pricing puts smes out of range.
Strengths
- Proprietary tooling: Everysearch / Luminr
- Covers 4 AI platforms (ChatGPT, Gemini, Perplexity, AI Overviews)
- Sector evidence: Retail, B2B, Travel
- Team size: 100+
Watch-outs
- Premium pricing puts SMEs out of range
- Smaller team caps execution capacity at peak demand
ClickSlice
ClickSlice is a London-based agency, founded in 2018, with a team of 20-50, covering AEO, GEO, LLMO, AI SEO, across b2b, retail, local services. UK businesses wanting full AI search platform coverage at SME pricing. Watch-out: smaller team than enterprise specialists.
Strengths
- Covers 5 AI platforms (ChatGPT, Gemini, Perplexity, AI Overviews, Copilot)
- Sector evidence: B2B, Retail, Local services
- Team size: 20-50
- Services: AEO, GEO, LLMO, AI SEO
Watch-outs
- Smaller team than enterprise specialists
- Smaller team caps execution capacity at peak demand
Charle
Charle is a London-based agency, founded in 2014, with a team of 20-50, covering AI SEO, GEO, Shopify, Ecommerce SEO, across ecommerce, shopify plus, dtc. Shopify and ecommerce brands wanting AI search + technical SEO together. Watch-out: ecommerce focus may not fit b2b service businesses.
Strengths
- Covers 4 AI platforms (ChatGPT, Gemini, Perplexity, AI Overviews)
- Sector evidence: Ecommerce, Shopify Plus, DTC
- Team size: 20-50
- Services: AI SEO, GEO, Shopify, Ecommerce SEO
Watch-outs
- Ecommerce focus may not fit B2B service businesses
- Smaller team caps execution capacity at peak demand
CarrieAnn Sudlow
CarrieAnn Sudlow is a Manchester-based agency, founded in 2018, with a team of 1-5, covering AI SEO, GEO, Consultancy, across saas, b2b, service businesses. Founder-led SaaS and B2B brands wanting hands-on consultant access. Watch-out: single-consultant capacity caps execution volume; no team cover.
Strengths
- Covers 4 AI platforms (ChatGPT, Gemini, Perplexity, AI Overviews)
- Sector evidence: SaaS, B2B, Service businesses
- Team size: 1-5
- Services: AI SEO, GEO, Consultancy
Watch-outs
- Single-consultant capacity caps execution volume
- No team cover
How SEOCompare Picked These Agencies
SEOCompare reviewed 40+ UK and international agencies offering AI SEO and shortlisted those with published case studies, transparent pricing, and AI platform coverage relevant to this comparison. Selection criteria included AI platform breadth (ChatGPT, Gemini, Perplexity, AI Overviews coverage), sector evidence, contract flexibility, and team size. We do not accept payment for inclusion or placement.
Frequently Asked Questions
What is LLM citation tracking?
LLM citation tracking measures whether your brand or content is cited when users ask the underlying questions across ChatGPT, Claude, Gemini, Perplexity, and AI Overviews. It is the most measurable form of AI SEO because citations are a clear binary outcome.
Which agency is best for LLM citation work?
Found has the deepest cross-platform measurement infrastructure for citation share. ClickSlice covers five AI platforms including Copilot. Charle and CarrieAnn Sudlow round out the credible specialist set. Impression covers cross-platform citations alongside organic ranking work.
How is citation share measured across LLMs?
Specialist agencies query each LLM at scale on a curated query set (commercial intent, comparison, informational), log brand mentions plus cited sources, and report share of voice across platforms. Some agencies build custom dashboards. Some use third-party tools (Profound, Otterly, Peec AI).
How long does it take to build LLM citation share?
Three to six months for early lift on long-tail and comparison queries. Six to twelve months for measurable share on category-defining queries. The entity authority foundations LLMs reward take time to mature, especially in regulated or high-trust verticals.
How much does LLM citation tracking cost?
Tracking-only services start around £200 to £500 a month for self-serve tools. Full-service LLM citation programmes (tracking plus optimisation) run £1,500 to £5,000 a month, settling at £2,500 to £3,000 for most mid-market engagements.
Should I track LLM citations or just optimise?
Both. Tracking without optimisation tells you the score but not how to change it. Optimisation without tracking flies blind. Credible LLM citation programmes always include both, with monthly reports tying optimisation work to measurable share movement.
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Oliver Mackman
AI Search Analyst, SEOCompare
Oliver leads SEOCompare's editorial and comparison research. With over a decade in digital marketing, he oversees agency evaluation, tool testing, and AI search data analysis.
Last reviewed: 7 April 2026
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