SaaS & B2B + UK
Best SaaS & B2B AI Agencies in the UK (September 2026)
25 SaaS & B2B-specialized AI agencies based in the UK. Top-ranked: Fast Data Science, Elsewhen, N-iX.
24 of the 25 agencies listed have documented SaaS & B2B client work, verified against published case studies.
Shipping an AI feature is easy; shipping one users keep after week two is not. These agencies build copilots, embedded assistants, and AI-native products for software companies—handling evaluation pipelines, latency budgets, and per-request model costs that decide whether the feature survives contact with real usage. The core disciplines are AI Development for production integration and AI Agents for assistant and workflow features, backed by published SaaS work rather than standalone demos.
Market snapshot
Pricing for SaaS & B2B AI agencies in the UK
Of the 25 SaaS & B2B AI agencies on this page, 18 carry complete hourly rate ranges. Across them, rates span €20–€260, with a median around €65/hr. Across the register, rated agencies in the UK bill €65–110/hr (27 rated).
“Of the 25 SaaS & B2B AI agencies in the UK on AIAgencies.eu, 18 carry an hourly rate range, from the agency itself or a third-party directory; the median of those 18 is about €65/hr (September 2026).” https:/
/ www. aiagencies. eu/ industries/ saas/ uk# market- snapshot
European AI agency hourly rates by country and region →
| Tier | Hourly rate | Agencies |
|---|---|---|
| Budget | Under €100/hr | 11—N-iX, Marionete, Blueberry Consultants, Softblues, Tiksom, Hexploits, Vention, Old St Labs, +3 more |
| Mid-tier | €100–149/hr | 5—Transparity, Found, iCentric Agency, Sputnik Digital, Ortom |
| Premium | €150–199/hr | 1—NOVOS |
| Top tier | €200+/hr | 1—Fast Data Science |
Team capacity in the UK
Of the 25 agencies on this page, 23 disclose team size. The distribution breaks down as:
- Boutique (<10)5 agencies—Fast Data Science, Sputnik Digital, Nebuli, Hexploits, App Web Dev
- Small/mid (10-49)9 agencies—Marionete, Blueberry Consultants, iCentric Agency, Softblues, Tiksom, NOVOS, B13 AI, Catalyst Marketing Agency, +1 more
- Mid studio (50-99)3 agencies—Elsewhen, Found, Old St Labs
- Large studio (100+)6 agencies—N-iX, Kainos, Transparity, Vention, Pixelette Technologies, Opinov8
Ranked agencies
Rankings updated · Newest review
Fast Data Science
#3London, United Kingdom
Client evidence: 8 documented clients overall
Best for: Pharma, research and public-sector buyers with an NLP problem on unstructured documents that has to survive review.
Elsewhen
#19London, United Kingdom
Elsewhen is a London product consultancy working with technology and financial-services companies, pairing product design and engineering with AI and cloud delivery.
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N-iX
#22London, United Kingdom
Client evidence: 4 documented clients overall
Best for: Enterprises with large in-house engineering teams that want AI adoption or ML work measured against an agreed baseline.
Kainos
#33Belfast, United Kingdom
Client evidence: 5 documented clients overall
Best for: UK public bodies and regulated enterprises buying delivery at program scale, with AI as one workstream inside a larger build.
Fuzzy Labs
#34Manchester, United Kingdom
Client evidence: 2 documented clients overall
Best for: Teams with a model that works in a notebook and needs to run, and keep running, in production.
Transparity
#38London, United Kingdom
Client evidence: 8 documented clients overall
Best for: UK enterprises, charities and public bodies already on Microsoft 365 and Azure that want Copilot adopted and governed.
Found
#39London, United Kingdom
Client evidence: 8 documented clients overall
Best for: UK consumer brands in retail, insurance and hospitality that want AI applied inside paid search, SEO and campaign data.
Marionete
#40London, United Kingdom
Client evidence: 6 documented clients overall
Best for: Banks and insurers that need the data and MLOps platform under their AI built to regulated-industry standards.
Blueberry Consultants
#48Birmingham, United Kingdom
Client evidence: 3 documented clients overall
Best for: Businesses hardening an AI prototype into a supportable production application, or embedding an LLM into software they already run.
iCentric Agency
#50London, United Kingdom
iCentric Agency is a London and Bedfordshire digital consultancy building custom platforms for enterprise clients, with machine-learning pricing, document processing and agentic tooling among its published specialisms.
Softblues
#66London, United Kingdom
Client evidence: 5 documented clients overall
Best for: Early-stage B2B product teams and smaller UK or Irish firms scoping a first voice agent, agent pipeline or Claude rollout.
Tiksom
#82Manchester, United Kingdom
Client evidence: 3 documented clients overall
Best for: Startups needing an agent system designed rather than assembled, from a shop whose wider client list runs to UNICEF and Erasmus MC.
Sputnik Digital
#83Manchester, United Kingdom
Client evidence: 2 documented clients overall
Best for: Early-stage software companies adding an AI feature that has to work on day one of the pitch.
Nebuli
#96London, United Kingdom
Client evidence: 5 documented clients overall
Best for: Organizations wanting a private, self-hosted generative AI workspace over their own documents rather than a public LLM.
Ortom
#99Manchester, United Kingdom
Client evidence: 3 documented clients overall
Best for: SMEs with one well-defined machine-learning problem who want a senior practitioner on it directly.
Hexploits
#101London, United Kingdom
Hexploits is a London software consultancy that builds AI platforms and cloud infrastructure for startups, taking product engineering from architecture through to production hosting.
Vention
#104London, United Kingdom
Client evidence: 10 documented clients overall
Best for: Venture-backed product companies adding engineers to an existing team, with AI as one feature inside the software work.
Old St Labs
#105London, United Kingdom
Client evidence: 29 documented clients overall
Best for: Founders and small UK firms building a first web or mobile product with an LLM feature inside it.
NOVOS
#120London, United Kingdom
Client evidence: 5 documented clients overall
Best for: Consumer e-commerce brands that want to be named in AI answers through SEO and digital PR, with share-of-answer tracking.
B13 AI
#127Birmingham, United Kingdom
Client evidence: 4 documented clients overall
Best for: UK founders and small product teams who need a build partner at UK-regional rates, with AI as one component of a wider system.
Catalyst Marketing Agency
#134Birmingham, United Kingdom
Catalyst Marketing Agency is a Birmingham lead-generation agency with London and Dubai offices, running search, content and paid media with a generative engine optimization practice for UK mid-market clients.
Pixelette Technologies
#136London, United Kingdom
Client evidence: 13 documented clients overall
Best for: Founders commissioning a first blockchain or AI product build on a startup budget who will check references before signing.
Opinov8
#137London, United Kingdom
Client evidence: 6 documented clients overall
Best for: Teams adding cloud, data or modernization engineers who want AI coding tools applied to that delivery.
ClickSlice
#139London, United Kingdom
Client evidence: 6 documented clients overall
Best for: UK online retailers that want an existing SEO campaign extended to how ChatGPT, Gemini and Perplexity recommend brands.
App Web Dev
#157Manchester, United Kingdom
App Web Dev is a Manchester practice building autonomous agent systems and workflow automation for UK businesses, run by a single founder who brings in collaborators per project.
Other industries served by UK SaaS & B2B agencies
Beyond SaaS & B2B, these 25 agencies also publish experience in:
| Industry | Agencies with stated experience |
|---|---|
| FinTech | 10 of 25 — Elsewhen, N-iX, Transparity, Found, Marionete, Tiksom, Sputnik Digital, Vention, Pixelette Technologies, Opinov8 |
| E-commerce | 10 of 25 — Found, iCentric Agency, Softblues, Ortom, Vention, Old St Labs, NOVOS, Pixelette Technologies, Opinov8, ClickSlice |
| Healthcare | 8 of 25 — Fast Data Science, Kainos, Transparity, Blueberry Consultants, Softblues, Nebuli, Old St Labs, B13 AI |
| Public Sector | 5 of 25 — Fast Data Science, Kainos, Transparity, Nebuli, Catalyst Marketing Agency |
| Manufacturing | 4 of 25 — N-iX, Fuzzy Labs, Marionete, Opinov8 |
| Legal | 1 of 25 — Softblues |
Most common services offered by UK SaaS & B2B agencies
These 25 SaaS & B2B agencies most commonly offer:
- AI Development21 of 25 — Fast Data Science, Elsewhen, N-iX, Kainos, +17 more
- AI Consulting20 of 25 — Fast Data Science, Elsewhen, N-iX, Kainos, +16 more
- AI Agents9 of 25 — N-iX, Transparity, Softblues, Tiksom, +5 more
- Generative AI8 of 25 — Elsewhen, N-iX, Kainos, Blueberry Consultants, +4 more
- AI Automation6 of 25 — Transparity, Found, iCentric Agency, Softblues, +2 more
- AI SEO4 of 25 — Found, NOVOS, Catalyst Marketing Agency, ClickSlice
Frequently asked questions — SaaS & B2B in the UK
- How much do SaaS & B2B AI agencies in the UK charge?
- Of the 25 SaaS & B2B AI agencies on this page, 18 publish complete hourly rate ranges. They range from €20 to €260, with a median around €65. Across the register, rated agencies in the UK bill €65–110/hr (27 rated). 11 agencies operate under €100/hr: N-iX, Marionete, Blueberry Consultants, Softblues.
- Which are the top-rated SaaS & B2B AI agencies in the UK?
- Based on our editorial scoring (portfolio quality, business credibility, and case study depth), the top-ranked SaaS & B2B AI agencies in the UK are Fast Data Science, Elsewhen, N-iX. See the full review on each agency's profile.
- What other industries do UK SaaS & B2B agencies serve?
- Beyond SaaS & B2B, the most common cross-industry experience among these agencies is FinTech (10 of 25 agencies). Notable examples include Elsewhen, N-iX, Transparity.
- How recent are these SaaS & B2B AI agency reviews?
- All 25 agencies on this page were editorially reviewed between Aug 4, 2026 and Sep 24, 2026 — the most recent being ClickSlice. See our review methodology for how scores are calculated.
- What's the smallest team size available for saas & b2b in the UK?
- Fast Data Science, Sputnik Digital, Nebuli are the boutique studios (under 10 people) on this page, ideal for projects needing senior-level attention without large-team overhead.
Local Insight
SaaS & B2B AI Agencies in the UK
Software buyers compare on price more than any other segment, and this page reflects it—rate publication runs higher here than on any other UK roster, which makes the scale range legible. At one end, Kainos, N-iX and Vention each list a thousand or more staff and sell delivery capacity. At the other, App Web Dev in Manchester is a single founder running agent pipelines whose published evidence is entirely self-built, with no client reference to check. Manchester's specialists cluster on this page: Fuzzy Labs for open-source MLOps, Sputnik Digital for AI features added to products that already have users, Tiksom for agent architecture, Ortom as a named-principal machine-learning practice. London spreads across the whole range, from Old St Labs at the early-stage end to Elsewhen, whose AI work is published under NDA but still carries numbers—a multi-model toolchain that reclaimed about a quarter of a FTSE 100 forecasting platform's discovery timeline and spend.
Stage of join is the screen that matters, not capability. A team arriving to build a feature and a team arriving to keep one running solve different problems, quote differently, and only the second cares about drift. Ask what a candidate measured after launch: per-request model cost, latency budget, and who reads the evaluation output in month nine. Fuzzy Labs publishes the sharpest version of that discipline—model deployment cut from two days to five minutes by a custom MLOps pipeline—because operating models is the practice rather than a service line. Then settle ownership before scoping: whose cloud account the system lives in, and whether the code and model artifacts transfer.
Intro by Gabor Kiss, curator · How we rank
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