# Best AI Agencies for Retainer Work in Zurich > 3 agencies. Top-ranked: Adnovum, Squirro, G+D Netcetera. Canonical page: https://www.aiagencies.eu/for/retainer/zurich Generated: 2026-09-28 · Curated by Gabor Kiss · No paid placements — inclusion, score, and rank are never sold. ## Ranked roster 1. **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 2. **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 3. **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 ## About this market Zurich's retainer bench is institutional, and its documented AI is thinner than its client lists. Adnovum has the clearest operated system: Berna, the voicebot that takes Gebäudeversicherung Bern's claim calls in parallel during storm events at up to 2,700 a day and transcribes Swiss German dialect into structured claim files. The speech technology is Spitch's; Adnovum's part is the architecture, the Azure integration and the managed service. Squirro sells its own Insights Engine plus the engineering around it and names the European Central Bank, Standard Chartered and Henkel, where 45 or more data sources were unified into one knowledge layer. G+D Netcetera's published client names sit on payments and platform engagements; its AI material is an expertise article on RiSIC, a claims-classification system with no named sponsor. For a Swiss buyer the retainer question is which vendor you would be calling in year two. With Adnovum the model layer belongs to a third party, so ask who supports it when the speech vendor changes a release, and note that Berna is limited today to storm and hail claims in German. With Squirro the retainer includes a license, so ask what happens to your knowledge graph if you stop paying it, and which line of the quote is license and which is delivery. With G+D Netcetera the acquisition means the contracting entity may not be the one you first meet, and the published AI is not yet a client engagement, so ask for one by name. ## Questions buyers ask ### How many AI agencies work with retainer in Zurich? 3 agencies in our directory combine verified retainer client evidence with a Zurich base. The current top-ranked are Adnovum, Squirro, G+D Netcetera — ordered by depth of documented client evidence, then our editorial scoring (portfolio quality, credibility, completeness); placement is never paid. ### 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