SaaS & B2B × B2B Companies
Best SaaS & B2B AI Agencies for B2B Companies (November 2026)
SaaS & B2B AI agencies with verified B2B client evidence — ranked by depth of documented work, then editorial quality.
Each listed agency evidences at least 2 documented B2B clients. Combined, the agencies below document 300 client engagements.
Ranked agencies for B2B clients
Rankings updated · Newest review
Top 30 of 85 agencies with documented B2B work.
London, 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.
Dublin, Ireland
Client evidence: 20 documented clients overall
Best for: Irish and European SMEs and founders buying a whole product build, with AI as one layer inside it rather than the whole engagement.
Preste
#3Paris, France
Client evidence: 17 documented clients overall
Best for: Hardware and industrial firms that need computer vision running on the device, not in the cloud, delivered as a 2–6 month build.
allUpp
#4Vienna, Austria
Client evidence: 16 documented clients overall
Best for: Companies already on Salesforce that want Agentforce agents added to service or sales workflows at a fixed package price.
ontolux
#5Berlin, Germany
Client evidence: 13 documented clients overall
Best for: German public bodies, broadcasters and publishers that need tagging and search over large German-language text collections.
London, 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.
Groningen, Netherlands
Client evidence: 12 documented clients overall
Best for: Northern Dutch organizations that need a build and the team trained to run it afterwards.
OstraconAI
Verified: the agency confirmed ownership from a company email address, and the listing passed editorial review#8Helsinki, Finland
Client evidence: 11 documented clients overall
Best for: Nordic marketing and sales teams that want AI tools built into HubSpot, Teams or Microsoft 365 and their own staff trained to run them.
Madrid, Spain
Client evidence: 11 documented clients overall
Best for: Consumer-facing brands and large operators in Spain evolving a digital product over years, with AI added into an existing workflow.
Dashbouquet
#10Tallinn, Estonia
Client evidence: 10 documented clients overall
Best for: Seed-stage founders who want an LLM feature or a data-extraction pipeline built into a product by the same team that ships the app.
Vention
#11London, 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.
Redkiwi
#12Rotterdam, Netherlands
Client evidence: 9 documented clients overall
Best for: Dutch consumer brands and B2B suppliers buying a website, webshop or campaign where generative AI speeds up content production.
London, 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.
Lautmaler
#14Berlin, Germany
Client evidence: 8 documented clients overall
Best for: Enterprises putting voice or chat in front of real customers, where a wrong answer reaches the public.
Transparity
#15London, 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
#16London, 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.
Merixstudio
#17Poznań, Poland
Client evidence: 8 documented clients overall
Best for: Product owners modernizing a platform who want AI inside the delivery process and in selected features, not a model built from scratch.
Stockholm, Sweden
Client evidence: 8 documented clients overall
Best for: Swedish B2B software and service companies that want search, paid media and AI-assistant visibility run by one marketing agency.
Shift Agency
#19Frankfurt, Germany
Client evidence: 8 documented clients overall
Best for: Enterprise brands and institutions rebuilding a website, newsroom or brand platform, with AI applied to marketing and visibility.
Rotterdam, Netherlands
Client evidence: 8 documented clients overall
Best for: Mid-sized Dutch companies that want ERP, CRM and finance data in one managed Power BI environment before any AI build.
InData Labs
Verified: the agency confirmed ownership from a company email address, and the listing passed editorial review#21Vilnius, Lithuania
Client evidence: 7 documented clients overall
Best for: Product teams with a defined forecasting, fraud or analytics problem who want an established ML team on fixed-price or dedicated terms.
Berlin, Germany
Client evidence: 7 documented clients overall
Best for: Product owners adding AI to an app that already has users, rather than starting from a model.
QED Software
#23Warsaw, Poland
Client evidence: 7 documented clients overall
Best for: Data-rich firms and startups with a detection, vision or forecasting problem suited to a research-led team.
Nimo AI
#24Stockholm, Sweden
Client evidence: 7 documented clients overall
Best for: Swedish small and mid-sized businesses automating one back-office process, such as document filing, order intake or HR reporting.
Tallinn, Estonia
Client evidence: 7 documented clients overall
Best for: Funded startups that need the interface and front end of an AI product designed and built while the model stays in-house.
Vstorm
#26Wrocław, Poland
Client evidence: 6 documented clients overall
Best for: Mid-market operators putting an agent inside a product or a clinical workflow, where output has to be validated before it ships.
Marionete
#27London, 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.
Algorithma
#28Stockholm, Sweden
Client evidence: 6 documented clients overall
Best for: Nordic retailers and service businesses that want customer operations run by agents and measured weekly.
Yield Studio
#29Lyon, France
Client evidence: 6 documented clients overall
Best for: French mid-market firms adding a document-analysis or automation layer to a SaaS or internal platform they already operate.
Frankfurt, Germany
Client evidence: 6 documented clients overall
Best for: German wholesalers, manufacturers and online retailers modernizing ordering, ERP and shop systems.
Head-to-head
About this list
When the client is a software company, AI delivery gets judged by product standards—latency, reliability, cost per request—because the system ships inside something other businesses pay for. The strongest agencies here combine verified B2B evidence with software-industry work. N-iX runs fine-tuned support-log models as SageMaker batch jobs under Airflow, with the architecture laid out step by step. Fuzzy Labs builds the MLOps layer that keeps models in production, in open-source infrastructure the client runs alone. Sputnik Digital shipped Invntry's image-identification system into an insurance product. Algorithma's agents serve operational software at volume, DataNorth pairs builds with team enablement, and Lautmaler, Hybrid Heroes, Violet AI and Ortom work the same territory.
Two screens matter most. Ownership: whose cloud account, who tunes the model quarter over quarter, what the client's engineers maintain unaided—a software company that cannot operate its own product feature has bought a dependency. And unit economics: a feature that works at demo volume and loses money at product volume is a prototype wearing production clothes. The strongest documented engagements on this page answer both; make every candidate do the same before comparing rates.
Intro by Gabor Kiss, curator · How we rank
Expert Insight
Why SaaS & B2B experience matters
Evaluation infrastructure—The difference between a demo and a durable feature is an eval suite: test sets, regression checks on prompt changes, quality metrics tied to user outcomes. Specialists build it alongside the feature; without it, every model update is a gamble shipped straight to production
Unit-economics engineering—Per-request model costs decide whether your feature has a margin. Specialists design cost ceilings in from the start—model routing, caching, context trimming—instead of discovering at scale that the assistant costs more than the seat
Handover quality—Your engineers inherit this code. Specialists deliver documented pipelines, reproducible evals, and infrastructure your team can run; agency-shaped black boxes turn into unmaintainable dependencies the day the contract ends
Product-not-project thinking—AI features need iteration loops after launch: feedback capture, failure review, prompt and model updates. Specialists set up that loop and a sane retainer for it; project shops ship the feature and leave you with version one forever
Frequently asked questions
85 agencies in our directory combine verified B2B client evidence with documented SaaS & B2B work. The current top-ranked are Old St Labs, Square Root Solutions, Preste — ordered by depth of documented client evidence, then our editorial scoring (portfolio quality, credibility, completeness); placement is never paid.
Published rates across this page's agencies run €20–300 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.
Each listed agency has at least two documented, named B2B 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.
17 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.