# Best AI SEO Agencies for Retainer Work

> 5 agencies. Top-ranked: Redkiwi, Found, ClickSlice.

Canonical page: https://www.aiagencies.eu/services/ai-seo/for/retainer
Generated: 2026-09-28 · Curated by Gabor Kiss · No paid placements — inclusion, score, and rank are never sold.

## Ranked roster
1. **Redkiwi** — Rotterdam, Netherlands · rate not published · team 10-49 · services: Generative AI, AI Marketing, AI SEO · 7 documented client engagements with source URLs · reviewed 2026-09-24 · https://www.aiagencies.eu/agency/redkiwi
2. **Found** — London, United Kingdom · €85-130/hr (directory-listed) · team 50-249 · founded 2005 · services: AI SEO, AI Marketing, AI Automation · 8 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/found
3. **ClickSlice** — London, United Kingdom · rate not published · team 10-49 · founded 2016 · services: AI SEO · 6 documented client engagements with source URLs · reviewed 2026-09-24 · https://www.aiagencies.eu/agency/clickslice
4. **NOVOS** — London, United Kingdom · €130-170/hr (directory-listed) · team 10-49 · founded 2018 · services: AI SEO, AI Marketing · 5 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/novos
5. **wukonig.com** — Graz, Austria · rate not published · founded 1999 · services: AI SEO, AI Consulting, AI Marketing · 3 documented client engagements with source URLs · reviewed 2026-09-09 · https://www.aiagencies.eu/agency/wukonig


## About this market
The AI SEO retainers documented here are visibility campaigns and measurement programs rather than systems, and they differ in how far their figures can be checked. NOVOS reports a sharp number: Osprey's share of AI answers in its category rose 21.4 points in twelve months to 72.6%; Heal's three-month digital PR campaign produced 23 pieces of coverage and 20 links from 18 domains aimed at publications LLMs cite. The study does not say which assistants, prompts or tracking tool produced the share figure, and NOVOS retainers are priced against its own Signal score. ClickSlice publishes before-and-after shares across ChatGPT, Gemini, Perplexity, Copilot and Google AI Overviews for named clients, National Private Investigators' visibility rising from 3.9% to 30.6%, though no case dates the campaign, names the tracking tool or publishes the prompt set. wukonig.com publishes its method in more detail than its outcomes: a fixed question set repeated across ChatGPT, Gemini, Perplexity and Google AI Overviews, scored on mention rate and cited sources, with ams OSRAM listed as ongoing advisory and no result published. Redkiwi's SEO evidence is conventional: Verder Liquids' 168% rise in quote requests came through the BrightEdge platform, and a card reading 'Advertising in ChatGPT' sits on a case describing Magento and Google campaigns.

A visibility retainer is only as good as the baseline it is measured against, so fix the question set, the assistants and the tracking tool in the contract. Ask NOVOS what an independent share-of-answer target would look like beside its Signal score; ask wukonig.com for a before-and-after on a named question set, since its published engagements are training and advisory; ask Redkiwi which parts of the scope touch AI answers at all. Working language matters here too, since wukonig.com publishes in German only.

## Questions buyers ask

### How many AI agencies work with retainer on ai seo?
5 agencies in our directory combine verified retainer client evidence with documented AI SEO work. The current top-ranked are Redkiwi, Found, ClickSlice — ordered by depth of documented client evidence, then our editorial scoring (portfolio quality, credibility, completeness); placement is never paid.

### How much does an AI agency cost for ai seo?
Published rates across this page's agencies run €85–170 per hour (median ~€129). Project totals depend on scope — the rate index at /rates breaks the computed bands down by region, country and team size.

### How is the retainer model verified?
Every agency here documents retainer work on its own site or in a published case study, describing the engagement structure rather than a service-list claim. We never infer the model from portfolio tone, so this list only contains agencies that operate retainer engagements deliberately.

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Source: AIAgencies.eu — the curated register of European AI agencies. Rate provenance: "agency-confirmed" = disclosed via submission or claimed profile; "directory-listed" = Clutch or two agreeing B2B directories (lone unverified sources are never written). Full method: https://www.aiagencies.eu/methodology · Rate index: https://www.aiagencies.eu/rates