# Best E-commerce AI Agencies for Retainer Work

> 25 agencies. Top-ranked: Square Root Solutions, ontolux, OstraconAI.

Canonical page: https://www.aiagencies.eu/industries/ecommerce/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. **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
3. **OstraconAI** — Helsinki, Finland · €250-400/hr (agency-confirmed) · team 10-49 · founded 2024 · services: AI Consulting, AI Marketing, AI Automation · 11 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/ostraconai
4. **Cloud District** — Madrid, Spain · €45-85/hr (directory-listed) · team 50-249 · founded 2010 · services: AI Development, AI Consulting · 11 documented client engagements with source URLs · reviewed 2026-09-20 · https://www.aiagencies.eu/agency/cloud-district
5. **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
6. **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
7. **Data Analytics** — Rotterdam, Netherlands · rate not published · team 10-49 · services: AI Consulting · 10 documented client engagements with source URLs · reviewed 2026-09-24 · https://www.aiagencies.eu/agency/data-analytics
8. **HolistiCRM** — Budapest, Hungary · €20-40/hr (directory-listed) · team 2-9 · founded 2014 · services: AI Automation, AI Consulting, AI Development · 7 documented client engagements with source URLs · reviewed 2026-09-09 · https://www.aiagencies.eu/agency/holisticrm
9. **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
10. **Syncronika** — Milan, Italy · rate not published · team 10-49 · founded 2010 · services: AI Agents, AI Automation, AI Consulting · 6 documented client engagements with source URLs · reviewed 2026-09-24 · https://www.aiagencies.eu/agency/syncronika
11. **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
12. **Atomic Actions** — Warsaw, Poland · €45-85/hr (directory-listed) · team 10-49 · founded 2024 · services: AI Automation, AI Consulting, AI Development · 5 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/atomic-actions
13. **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
14. **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
15. **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
16. **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
17. **Sngular** — Madrid, Spain · rate not published · team 1000+ · founded 2014 · services: AI Development, AI Consulting · 3 documented client engagements with source URLs · reviewed 2026-09-20 · https://www.aiagencies.eu/agency/sngular
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. **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
20. **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
21. **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
22. **VisualLabs** — Budapest, Hungary · €45-85/hr (directory-listed) · team 10-49 · founded 2017 · services: AI Automation, AI Agents, AI Consulting · 3 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/visuallabs
23. **Fantasy Space** — Madrid, Spain · €20-40/hr (directory-listed) · team 10-49 · founded 2020 · services: AI Development, AI Agents, AI Automation, AI Consulting · 3 documented client engagements with source URLs · reviewed 2026-09-09 · https://www.aiagencies.eu/agency/fantasy-space
24. **Dmlab** — Budapest, Hungary · rate not published · team 10-49 · founded 2007 · services: AI Consulting, AI Development · 2 documented client engagements with source URLs · reviewed 2026-09-09 · https://www.aiagencies.eu/agency/dmlab
25. **Amsterdam Data Collective** — Amsterdam, Netherlands · rate not published · services: AI Consulting, AI Development · 2 documented client engagements with source URLs · reviewed 2026-08-04 · https://www.aiagencies.eu/agency/amsterdam-data-collective

## Compared head-to-head
Curated comparison pages (published rates, team size, coverage, projected 12-week engagement cost, and the curator's verdict on both sides — pairings are never sold):
- Dmlab vs HolistiCRM: https://www.aiagencies.eu/compare/dmlab-vs-holisticrm

## About this market
Most of the e-commerce work documented on this page is storefront, integration and demand generation, with AI at the edges. Syncronika keeps Caffitaly's Shopify store in sync with SAP through its own Python middleware, non-AI work in decade-long relationships. Redkiwi's Bruynzeel Keukens Magento webshop and Eshuis label-ordering platform carry no AI component, while Esbjaerg Vodka's repositioning used a generated image library in place of a shoot. NOVOS is the demand-side specialist: Osprey's share of AI answers reached 72.6%, and MORI's December revenue rose 73% after the KIDLY migration onto Shopify. OstraconAI's Olo-apteekki banner generator turned 20 to 30 minutes of production per set into near-instant output from real product images. Data Analytics built Diamond Point's reporting over POS, e-commerce and inventory data. G+D Netcetera's STET engagement is Click to Pay for French e-commerce transactions, a payments rail. Ekimetrics models marketing mix, Eurostar the named case; Inbold's ARKK campaign is generated backgrounds around a studio shoot. The model-led cases are fewer: Found's deep neural network predicting each product's 30-day sales value for Secret Sales is credited with 28% higher ROAS than the account's other Shopping campaigns, and HolistiCRM's classifiers and recommender for Delivery Hero's Hungarian brand with open rates up 250 percent.

Ask which layer of the shop the retainer touches, and how much of the monthly scope is a model rather than a Magento or Shopify sprint. Storefront retainers are judged on uptime and release cadence; demand retainers on numbers you can verify, and the curator notes that Heal's and MORI print the same headline figure on NOVOS's site. If a proposal describes an agent in the shop, ask for the client where it runs today; the cases documented for Syncronika and Redkiwi stop short of that.

## Questions buyers ask

### How many AI agencies work with retainer on e-commerce?
25 agencies in our directory combine verified retainer client evidence with documented E-commerce work. The current top-ranked are Square Root Solutions, ontolux, OstraconAI — 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 e-commerce?
Published rates across this page's agencies run €20–400 per hour (median ~€65). 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?
3 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