# Best AI Agencies for Retainer Work in Madrid > 4 agencies. Top-ranked: Cloud District, Plain Concepts, Sngular. Canonical page: https://www.aiagencies.eu/for/retainer/madrid Generated: 2026-09-28 · Curated by Gabor Kiss · No paid placements — inclusion, score, and rank are never sold. ## Ranked roster 1. **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 2. **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 3. **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 4. **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 ## About this market The continuity documented in Madrid is mostly product continuity, with AI inside it. Cloud District has rebuilt and evolved Compass Group Spain's purchasing portal and Menu Planner since 2020, with 745,000 orders and 710,000 goods receipts handled through them in 2025, has worked with Globalvia since 2019, and runs a generative-AI translation layer in Pangea's CMS, live in four markets with human validation. Plain Concepts sells MLOps and AIOps as managed services and describes a long-running partnership with Nestlé's Global IT Hub spanning phishing-URL inspection, an MLOps platform and a governed generative-AI platform for employees. Sngular took over operation, maintenance and monitoring of the web apps and APIs it built, and its Connected Works telemetry for Ferrovial runs on the Tiétar high-speed rail works and High Speed Two. Fantasy Space offers post-launch support and maintenance; Leanzer has run four years with a team of eight. A Madrid buyer should ask what the monthly fee actually operates. Keeping an app current, running a model platform and retraining a model are three different contracts that can carry the same name. Ask each firm whether the retainer covers monitoring of model output or only uptime, what is measured each month, and what you receive at exit. The curator notes that few studies here name a model or evaluation method, so ask for that before signing anything described as AI operations. ## Questions buyers ask ### How many AI agencies work with retainer in Madrid? 4 agencies in our directory combine verified retainer client evidence with a Madrid base. The current top-ranked are Cloud District, Plain Concepts, Sngular — 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 in Madrid? Published rates across this page's agencies run €20–130 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. --- 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