# Best SaaS & B2B AI Agencies in London > 17 agencies. Top-ranked: Fast Data Science, Elsewhen, iCentric Agency. Canonical page: https://www.aiagencies.eu/industries/saas/london Generated: 2026-09-17 · Curated by Gabor Kiss · No paid placements — inclusion, score, and rank are never sold. ## Ranked roster 1. **Fast Data Science** — London, United Kingdom · €175-260/hr (directory-listed) · team 2-9 · founded 2018 · services: AI Development, AI Consulting · 8 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/fast-data-science 2. **Elsewhen** — London, United Kingdom · rate not published · team 50-249 · founded 2011 · services: AI Development, AI Consulting, Generative AI · 2 documented client engagements with source URLs · reviewed 2026-08-06 · https://www.aiagencies.eu/agency/elsewhen 3. **iCentric Agency** — London, United Kingdom · €85-130/hr (directory-listed) · team 10-49 · founded 2002 · services: AI Development, AI Consulting, AI Automation, Generative AI · 2 documented client engagements with source URLs · reviewed 2026-08-06 · https://www.aiagencies.eu/agency/icentric-agency 4. **Nebuli** — London, United Kingdom · rate not published · team 2-9 · founded 2019 · services: Generative AI, AI Development, AI Consulting · 5 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/nebuli 5. **Hexploits** — London, United Kingdom · €45-85/hr (directory-listed) · team 2-9 · founded 2018 · services: AI Development, AI Agents, AI Consulting · 3 documented client engagements with source URLs · reviewed 2026-08-06 · https://www.aiagencies.eu/agency/hexploits 6. **Vention** — London, United Kingdom · €45-85/hr (directory-listed) · team 1000+ · founded 2002 · services: AI Development, AI Consulting, AI Agents · https://www.aiagencies.eu/agency/vention 7. **NOVOS** — London, United Kingdom · €130-170/hr (directory-listed) · team 10-49 · founded 2018 · services: AI SEO, AI Marketing · https://www.aiagencies.eu/agency/novos 8. **Transparity** — London, United Kingdom · €85-130/hr (directory-listed) · team 250+ · founded 2015 · services: AI Consulting, AI Development, AI Automation, AI Agents · https://www.aiagencies.eu/agency/transparity 9. **Pixelette Technologies** — London, United Kingdom · €20-40/hr (directory-listed) · team 250+ · founded 2018 · services: AI Development, AI Agents, AI Consulting, Generative AI · https://www.aiagencies.eu/agency/pixelette-technologies 10. **Softblues** — London, United Kingdom · €45-85/hr (directory-listed) · team 10-49 · founded 2014 · services: AI Automation, AI Agents, AI Consulting, AI Development · https://www.aiagencies.eu/agency/softblues 11. **Found** — London, United Kingdom · €85-130/hr (directory-listed) · team 50-249 · founded 2005 · services: AI SEO, AI Marketing, AI Automation · https://www.aiagencies.eu/agency/found 12. **N-iX** — London, United Kingdom · €45-85/hr (directory-listed) · team 1000+ · founded 2002 · services: AI Consulting, AI Development, Generative AI, AI Agents · https://www.aiagencies.eu/agency/n-ix 13. **Marionete** — London, United Kingdom · €45-85/hr (directory-listed) · team 10-49 · founded 2016 · services: AI Consulting, AI Development · https://www.aiagencies.eu/agency/marionete 14. **Old St Labs** — London, United Kingdom · €45-85/hr (directory-listed) · team 50-249 · founded 2020 · services: AI Development, AI Consulting · https://www.aiagencies.eu/agency/old-st-labs 15. **Opinov8** — London, United Kingdom · €45-85/hr (directory-listed) · team 250+ · founded 2017 · services: AI Consulting, AI Development, AI Agents, Generative AI · https://www.aiagencies.eu/agency/opinov8 16. **Molo Agency** — London, United Kingdom · €45-85/hr (directory-listed) · team 2-9 · founded 2021 · services: AI Automation, AI Agents, AI Development · https://www.aiagencies.eu/agency/molo-agency 17. **ClickSlice** — London, United Kingdom · rate not published · team 2-9 · founded 2016 · services: AI SEO, AI Marketing · https://www.aiagencies.eu/agency/clickslice ## About this market Software companies buy AI differently from the enterprises around them: the system usually ships inside a product other people pay for, so it has to survive its own users. The agencies here sit at different points of that. Hexploits engineers the platform itself — for swarmd.ai it built a multi-protocol agent relay, a gateway across model providers and a tenant-aware control plane, nine microservices into production, with the client keeping the codebase. Elsewhen works on product and platform for technology companies including Google and Spotify, and its published AI work is measured in booking revenue and reclaimed project timeline. iCentric builds multi-tenant platforms, including an agentic content-management product where clients manage a site through an assistant. The page has since widened past pure engineering: Fast Data Science does language work for the recruitment platform CV-Library, Nebuli builds knowledge systems, and NOVOS, Found, ClickSlice and Molo Agency arrive from the demand side, selling AI-search visibility and automation to software companies rather than building their products. Three more engineering firms have joined since: Opinov8 with an agent deployment platform, Pixelette Technologies from computer vision and data automation, and Old St Labs from the product-studio end. Read that split first, because it is two markets on one page. The question that separates the builders is ownership after handover. Ask who runs the system in six months, whose cloud account it lives in, and what the release cadence looks like once the agency has gone. ## Questions buyers ask ### How much do SaaS & B2B AI agencies in London charge? Of the 17 SaaS & B2B AI agencies on this page, 14 publish complete hourly rate ranges. They range from €20 to €260, with a median around €65. Across the register, rated agencies in London bill €65–110/hr (19 rated). 12 agencies operate under €100/hr: iCentric Agency, Hexploits, Vention, Transparity. ### Which are the top-rated SaaS & B2B AI agencies in London? Based on our editorial scoring (portfolio quality, business credibility, and case study depth), the top-ranked SaaS & B2B AI agencies in London are Fast Data Science, Elsewhen, iCentric Agency. See the full review on each agency's profile. ### What other industries do London SaaS & B2B agencies serve? Beyond SaaS & B2B, the most common cross-industry experience among these agencies is E-commerce (10 of 17 agencies). Notable examples include iCentric Agency, Vention, NOVOS. ### How recent are these SaaS & B2B AI agency reviews? 5 of the 17 agencies on this page have been editorially reviewed between Aug 6, 2026 and Sep 7, 2026 — the most recent being Nebuli. See our review methodology for how scores are calculated. ### What's the smallest team size available for saas & b2b in London? Fast Data Science, Nebuli, Hexploits are the boutique studios (under 10 people) on this page, ideal for projects needing senior-level attention without large-team overhead. --- 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