# Best AI Automation Agencies for Retainer Work

> 16 agencies. Top-ranked: Lexunit, OstraconAI, Hiflylabs.

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

## Ranked roster
1. **Lexunit** — Budapest, Hungary · €45-85/hr (directory-listed) · team 10-49 · founded 2017 · services: AI Development, AI Automation, AI Consulting · 9 documented client engagements with source URLs · reviewed 2026-09-03 · https://www.aiagencies.eu/agency/lexunit
2. **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
3. **Hiflylabs** — Budapest, Hungary · rate not published · team 250+ · founded 2015 · services: AI Consulting, AI Development, AI Automation · 8 documented client engagements with source URLs · reviewed 2026-09-03 · https://www.aiagencies.eu/agency/hiflylabs
4. **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
5. **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
6. **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
7. **Siili Solutions** — Helsinki, Finland · €45-85/hr (directory-listed) · team 250+ · founded 2005 · services: AI Consulting, AI Development, AI Automation · 5 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/siili-solutions
8. **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
9. **Pexon Consulting** — Munich, Germany · €130-175/hr (directory-listed) · team 50-249 · founded 2019 · services: AI Consulting, AI Development, AI Automation · 6 documented client engagements with source URLs · reviewed 2026-09-20 · https://www.aiagencies.eu/agency/pexon-consulting
10. **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
11. **Flobotics** — Warsaw, Poland · €85-130/hr (directory-listed) · team 10-49 · founded 2019 · services: AI Automation, AI Agents, AI Development · 3 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/flobotics
12. **Neuron Solutions** — Budapest, Hungary · €85-130/hr (directory-listed) · team 10-49 · founded 2018 · services: AI Consulting, AI Development, AI Automation · 3 documented client engagements with source URLs · reviewed 2026-09-09 · https://www.aiagencies.eu/agency/neuron-solutions
13. **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
14. **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
15. **Grepton** — Budapest, Hungary · rate not published · team 50-249 · founded 2001 · services: AI Automation, AI Agents, AI Consulting, AI Development · 5 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/grepton
16. **Konversational** — Dublin, Ireland · rate not published · team 50-249 · founded 2020 · services: AI Automation, AI Agents, AI Consulting · 3 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/konversational

## 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):
- Faculty vs Hiflylabs: https://www.aiagencies.eu/compare/faculty-ai-vs-hiflylabs
- Hiflylabs vs HolistiCRM: https://www.aiagencies.eu/compare/hiflylabs-vs-holisticrm
- OstraconAI vs Siili Solutions: https://www.aiagencies.eu/compare/ostraconai-vs-siili-solutions

## About this market
Automation on retainer means an operated workflow, and the cases here show who operates. OstraconAI's inbound pipeline for Singa runs on n8n and Gemini, enriching, scoring and routing leads into HubSpot; it went live in week three, manual sorting fell from 45 minutes a day to single-digit minutes, and the write-up records a Slack channel for flagging errors and prompts tuned weekly. Pexon Consulting's automation at Deutz sits inside the client's Azure tenant, where freight-invoice checking went from three days per batch to eight minutes with department-level permissions enforced at retrieval. Siili Solutions keeps Bobotin at LähiTapiola Finance as a managed service, drafting replies and classifying complaints while a person checks and sends. Syncronika's documented automation is ActiveCampaign and SAP middleware for Caffitaly and Sebach; its AI products, LOCRAI and AgenVIO, publish a pipeline design but no named client running them.

The sorting question for an automation retainer is who tunes it in month six. A low-code build is fast to launch and easy to orphan, so ask who owns the workflows and the accounts they run on, and who reads the error channel; the curator raises exactly this for OstraconAI. Inside your own tenant, as Pexon builds, the question becomes which named engineers do the work and where they sit. A managed service like Siili's needs the throughput figures before and after, which its published case does not yet carry. For Syncronika, ask for a production deployment you can call.

## Questions buyers ask

### How many AI agencies work with retainer on ai automation?
16 agencies in our directory combine verified retainer client evidence with documented AI Automation work. The current top-ranked are Lexunit, OstraconAI, Hiflylabs — 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 automation?
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?
4 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