# Best AI Agencies for Startups in London > 6 agencies. Top-ranked: Old St Labs, Pixelette Technologies, Vention. Canonical page: https://www.aiagencies.eu/for/startups/london Generated: 2026-09-23 · Curated by Gabor Kiss · No paid placements — inclusion, score, and rank are never sold. ## Ranked roster 1. **Old St Labs** — London, United Kingdom · €45-85/hr (directory-listed) · team 50-249 · founded 2020 · services: AI Development, AI Consulting · 10 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/old-st-labs 2. **Pixelette Technologies** — London, United Kingdom · €20-40/hr (directory-listed) · team 250+ · founded 2018 · services: AI Development, AI Agents, AI Consulting, Generative AI · 7 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/pixelette-technologies 3. **Vention** — London, United Kingdom · €45-85/hr (directory-listed) · team 1000+ · founded 2002 · services: AI Development, AI Consulting, AI Agents · 10 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/vention 4. **Opinov8** — London, United Kingdom · €45-85/hr (directory-listed) · team 250+ · founded 2017 · services: AI Consulting, AI Development, AI Agents, Generative AI · 6 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/opinov8 5. **Softblues** — London, United Kingdom · €45-85/hr (directory-listed) · team 10-49 · founded 2014 · 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/softblues 6. **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 ## About this market Startup AI work in London, on this page, mostly comes from product and engineering studios rather than AI specialists, so the useful question is how much of the build is AI at all. Softblues publishes the deepest stack detail: an eight-agent voice line for Roof Maker that is live and writing HubSpot tickets, and a SofiaHR assessment pipeline of fine-tuned Gemini models validated against expert analysts before its beta. Imobisoft's two named systems are in operational use—M-PREG, a UKCA-marked preeclampsia risk platform for MirZyme Therapeutics, and a Legionella compliance platform for Hydraclean—though neither study describes the modeling. Old St Labs documents a GPT and PaLM math tutor for Brainie, measured in test sessions rather than after launch. Vention and Opinov8 sell engineering capacity to venture-backed teams, with AI usually one feature inside the software work, and Pixelette's published record splits between AI studies and a longer run of blockchain builds. For a startup, the question that saves money is where the AI ends. Ask each candidate which part of your product needs a model, which part is ordinary software, and what the model will cost to run each month at your expected usage—a studio that answers the first question honestly will usually price the second one too. ## Questions buyers ask ### How many AI agencies work with startup in London? 6 agencies in our directory combine verified startup client evidence with a London base. The current top-ranked are Old St Labs, Pixelette Technologies, Vention — 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 London? Published rates across this page's agencies run €20–85 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 startup experience verified on this page? Each listed agency has at least two documented, named startup clients — published case studies or engagement descriptions our research actually read, with source URLs stored per client. Logo walls without published evidence carry no weight, which is what separates this list from self-declared directories. ### 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. --- 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