# Best Generative AI Agencies for Retainer Work

> 24 agencies. Top-ranked: Square Root Solutions, Storm Technology, ontolux.

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

## Ranked roster
1. **Square Root Solutions** — Dublin, Ireland · €20-40/hr (directory-listed) · team 10-49 · founded 2018 · services: AI Development, Generative AI · 10 documented client engagements with source URLs · reviewed 2026-09-16 · https://www.aiagencies.eu/agency/square-root-solutions
2. **Storm Technology** — Dublin, Ireland · rate not published · team 50-249 · founded 1995 · services: AI Consulting, Generative AI, AI Development · 8 documented client engagements with source URLs · reviewed 2026-09-03 · https://www.aiagencies.eu/agency/storm-technology
3. **ontolux** — Berlin, Germany · rate not published · team 10-49 · services: AI Development, AI Consulting, Generative AI · 11 documented client engagements with source URLs · reviewed 2026-09-24 · https://www.aiagencies.eu/agency/ontolux
4. **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
5. **Hybrid Heroes** — Berlin, Germany · €85-130/hr (directory-listed) · team 10-49 · founded 2015 · services: AI Consulting, AI Development, Generative AI, AI Agents · 7 documented client engagements with source URLs · reviewed 2026-08-05 · https://www.aiagencies.eu/agency/hybrid-heroes
6. **QED Software** — Warsaw, Poland · €85-130/hr (directory-listed) · team 10-49 · founded 1999 · services: AI Consulting, AI Development, Generative AI · 7 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/qed-software
7. **Version 1** — Dublin, Ireland · rate not published · team 250+ · founded 1996 · services: AI Consulting, AI Development, Generative AI · 6 documented client engagements with source URLs · reviewed 2026-09-03 · https://www.aiagencies.eu/agency/version-1
8. **Bismart** — Barcelona, Spain · rate not published · team 50-249 · founded 2009 · services: AI Consulting, AI Development, Generative AI · 6 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/bismart
9. **Adnovum** — Zurich, Switzerland · rate not published · team 250+ · founded 1988 · services: AI Development, AI Consulting, Generative AI · 5 documented client engagements with source URLs · reviewed 2026-08-07 · https://www.aiagencies.eu/agency/adnovum
10. **Plain Concepts** — Madrid, Spain · €85-130/hr (directory-listed) · team 250+ · founded 2006 · services: AI Consulting, AI Development, Generative AI · 4 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/plain-concepts
11. **Squirro** — Zurich, Switzerland · rate not published · team 50-249 · founded 2012 · services: Generative AI, AI Development · 6 documented client engagements with source URLs · reviewed 2026-08-07 · https://www.aiagencies.eu/agency/squirro
12. **Imobisoft** — London, United Kingdom · €45-85/hr (directory-listed) · team 10-49 · founded 2009 · services: AI Consulting, AI Development, Generative AI · 4 documented client engagements with source URLs · reviewed 2026-09-04 · https://www.aiagencies.eu/agency/imobisoft
13. **Contiamo** — Berlin, Germany · rate not published · team 10-49 · founded 2012 · services: AI Consulting, AI Development, Generative AI · 6 documented client engagements with source URLs · reviewed 2026-09-24 · https://www.aiagencies.eu/agency/contiamo
14. **Ekimetrics** — London, United Kingdom · rate not published · team 50-249 · founded 2006 · services: AI Consulting, AI Marketing, Generative AI · 8 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/ekimetrics
15. **TEKenable** — Dublin, Ireland · rate not published · team 50-249 · founded 2002 · services: AI Consulting, Generative AI, AI Development · 4 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/tekenable
16. **Faculty** — London, United Kingdom · rate not published · founded 2014 · services: AI Consulting, AI Development, AI Automation, AI Agents · 3 documented client engagements with source URLs · reviewed 2026-08-04 · https://www.aiagencies.eu/agency/faculty-ai
17. **Xomnia** — Amsterdam, Netherlands · rate not published · team 50-249 · founded 2013 · services: AI Consulting, AI Development, Generative AI · 3 documented client engagements with source URLs · reviewed 2026-08-04 · https://www.aiagencies.eu/agency/xomnia
18. **Boldare** — Amsterdam, Netherlands · €45-85/hr (directory-listed) · team 50-249 · founded 2004 · services: AI Development, Generative AI, AI Consulting · 5 documented client engagements with source URLs · reviewed 2026-09-24 · https://www.aiagencies.eu/agency/boldare
19. **wegewerk** — Berlin, Germany · rate not published · services: AI Consulting, AI Development, Generative AI · 3 documented client engagements with source URLs · reviewed 2026-08-05 · https://www.aiagencies.eu/agency/wegewerk
20. **G+D Netcetera** — Zurich, Switzerland · rate not published · team 1000+ · founded 1996 · services: AI Development, Generative AI · 1 documented client engagement with source URLs · reviewed 2026-08-07 · https://www.aiagencies.eu/agency/netcetera
21. **Inbold** — Oslo, Norway · €85-130/hr (directory-listed) · team 50-249 · founded 2005 · services: AI Marketing, Generative AI, AI Consulting · 3 documented client engagements with source URLs · reviewed 2026-09-09 · https://www.aiagencies.eu/agency/inbold
22. **Neurons Lab** — London, United Kingdom · rate not published · team 50-249 · founded 2019 · services: AI Consulting, AI Agents, AI Development, Generative AI · 2 documented client engagements with source URLs · reviewed 2026-08-04 · https://www.aiagencies.eu/agency/neurons-lab
23. **Clearlead AI Consulting** — Dublin, Ireland · €85-130/hr (directory-listed) · team 2-9 · founded 2024 · services: AI Consulting, AI Development, Generative AI · 2 documented client engagements with source URLs · reviewed 2026-09-16 · https://www.aiagencies.eu/agency/clearlead-ai-consulting
24. **The AI Consultancy** — London, United Kingdom · rate not published · services: AI Consulting, AI Development, Generative AI, AI Agents · 2 documented client engagements with source URLs · reviewed 2026-08-04 · https://www.aiagencies.eu/agency/the-ai-consultancy


## About this market
Generative AI on retainer splits into models that produce assets and models that answer questions, and the two kinds carry different evidence. Redkiwi replaced a photo shoot at Esbjaerg Vodka with a generated image and video library, and ran 552,000 images through Gemini's image models on Cloudflare for its own EK88look campaign, publishing the per-image cost. Inbold built ARKK Copenhagen's global campaign from generated backgrounds around a studio shoot and published the full credit list. On the answering side, Contiamo's GPT-4o customer chatbot has answered tariff and pricing questions on Stadtwerke Bonn's website for over a year, and its company-specific chatbots were rolled out across the Gewobag housing group, both described in named client testimonials rather than case studies; Adnovum operates Gebäudeversicherung Bern's Berna voicebot, which transcribes Swiss German dialect claim calls at up to 2,700 a day; Squirro's licensed engine unified 45 or more data sources into a knowledge layer at Henkel; Bismart's retrieval system over technical manuals reports 70% less time to understand a product, on an anonymous landing page. Ekimetrics' climate-risk engine uses LLM-generated vulnerability assessments with expert validation, also unnamed. G+D Netcetera's AI artifact, RiSIC, is claims classification described in an expertise article rather than a generative deployment.

Decide which kind you are retaining before comparing quotes. A production retainer is priced on volume and turnaround, and Redkiwi's published per-image cost is the kind of number to ask everyone for. An answering system is priced on operation, so ask about monitoring, retraining and, as the curator raises for Squirro, what happens to the retrieval layer if the license lapses. Where the strongest case is anonymous, as at Bismart and Ekimetrics, ask for the named account first.

## Questions buyers ask

### How many AI agencies work with retainer on generative ai?
24 agencies in our directory combine verified retainer client evidence with documented Generative AI work. The current top-ranked are Square Root Solutions, Storm Technology, ontolux — 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 generative ai?
Published rates across this page's agencies run €20–130 per hour (median ~€108). 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.

### Can these agencies embed consultants with our team?
5 of the agencies on this page document an embedded / team-extension working model. See the team-extension page for the full verified list, or check the engagement chips on individual profiles.

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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