# Best SaaS & B2B AI Agencies for Startups

> 27 agencies. Top-ranked: Old St Labs, Square Root Solutions, Pixelette Technologies.

Canonical page: https://www.aiagencies.eu/industries/saas/for/startups
Generated: 2026-10-21 · 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. **Square Root Solutions** — Dublin, Ireland · €20-40/hr (directory-listed) · team 10-49 · founded 2018 · services: AI Development, Generative AI · 10 documented client engagements with source URLs · reviewed 2026-09-16 · https://www.aiagencies.eu/agency/square-root-solutions
3. **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
4. **OstraconAI** — Helsinki, Finland · €200-300/hr (agency-confirmed) · team 10-49 · founded 2024 · services: AI Consulting, AI Marketing, AI Automation · 11 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/ostraconai
5. **Dashbouquet** — Tallinn, Estonia · €45-85/hr (directory-listed) · team 50-249 · founded 2014 · services: AI Development, Generative AI, AI Consulting · 5 documented client engagements with source URLs · reviewed 2026-09-03 · https://www.aiagencies.eu/agency/dashbouquet
6. **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
7. **InData Labs** — Vilnius, Lithuania · €50-100/hr (agency-confirmed) · team 50-249 · founded 2014 · services: AI Development, AI Consulting, Generative AI, AI Automation · 9 documented client engagements with source URLs · reviewed 2026-10-09 · https://www.aiagencies.eu/agency/indata-labs
8. **QED Software** — Warsaw, Poland · €85-130/hr (directory-listed) · team 10-49 · founded 1999 · services: AI Consulting, AI Development, Generative AI · 7 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/qed-software
9. **Phenomenon Studio** — Tallinn, Estonia · €45-85/hr (directory-listed) · team 50-249 · founded 2019 · services: AI Development, AI Consulting · 7 documented client engagements with source URLs · reviewed 2026-09-03 · https://www.aiagencies.eu/agency/phenomenon-studio
10. **Vstorm** — Wrocław, Poland · €85-130/hr (directory-listed) · team 10-49 · founded 2017 · services: AI Consulting, AI Development, Generative AI, AI Agents · 8 documented client engagements with source URLs · reviewed 2026-09-08 · https://www.aiagencies.eu/agency/vstorm
11. **Yield Studio** — Lyon, France · €85-130/hr (directory-listed) · team 50-249 · founded 2019 · services: AI Development, Generative AI, AI Agents · 6 documented client engagements with source URLs · reviewed 2026-09-04 · https://www.aiagencies.eu/agency/yield-studio
12. **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
13. **Tooploox** — Wrocław, Poland · €45-85/hr (directory-listed) · team 50-249 · founded 2012 · services: AI Development, Generative AI, AI Consulting · 6 documented client engagements with source URLs · reviewed 2026-09-08 · https://www.aiagencies.eu/agency/tooploox
14. **Upside Lab** — Kraków, Poland · €85-130/hr (directory-listed) · team 10-49 · founded 2017 · services: AI Consulting, AI Development, AI Automation · 6 documented client engagements with source URLs · reviewed 2026-09-08 · https://www.aiagencies.eu/agency/upside-lab
15. **Indigo Labs** — Ljubljana, Slovenia · €45-85/hr (directory-listed) · team 10-49 · founded 2021 · services: AI Development, AI Automation, AI Agents · 5 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/indigo-labs
16. **Buildo** — Milan, Italy · €85-130/hr (directory-listed) · team 10-49 · founded 2013 · services: AI Development, AI Consulting · 5 documented client engagements with source URLs · reviewed 2026-09-03 · https://www.aiagencies.eu/agency/buildo
17. **Valletta Software Development** — Valletta, Malta · €45-85/hr (directory-listed) · team 50-249 · founded 2009 · services: AI Development, Generative AI, AI Agents · 5 documented client engagements with source URLs · reviewed 2026-09-24 · https://www.aiagencies.eu/agency/valletta-software
18. **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
19. **Lizard Global** — Rotterdam, Netherlands · €45-85/hr (directory-listed) · team 50-249 · founded 2012 · services: AI Development, AI Automation, Generative AI · 5 documented client engagements with source URLs · reviewed 2026-09-04 · https://www.aiagencies.eu/agency/lizard-global
20. **xtream** — Milan, Italy · €45-85/hr (directory-listed) · team 10-49 · founded 2018 · services: AI Development, AI Consulting · 4 documented client engagements with source URLs · reviewed 2026-09-03 · https://www.aiagencies.eu/agency/xtream
21. **TechnoLynx** — Budapest, Hungary · €85-130/hr (directory-listed) · team 10-49 · founded 2019 · services: AI Development, AI Automation · 4 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/technolynx
22. **Qemie** — Frankfurt, Germany · €85-130/hr (directory-listed) · team 2-9 · founded 2021 · services: AI Automation, AI Agents, Generative AI · 4 documented client engagements with source URLs · reviewed 2026-09-16 · https://www.aiagencies.eu/agency/qemie
23. **B13 AI** — Birmingham, United Kingdom · €20-40/hr (directory-listed) · team 10-49 · founded 2010 · services: AI Development, AI Consulting · 4 documented client engagements with source URLs · reviewed 2026-09-04 · https://www.aiagencies.eu/agency/b13-ai
24. **Softspring** — Madrid, Spain · €50-75/hr (agency-confirmed) · team 2-9 · founded 2018 · services: AI Consulting, AI Development, AI Automation · 3 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/softspring
25. **Fantasy Space** — Madrid, Spain · €20-40/hr (directory-listed) · team 10-49 · founded 2020 · services: AI Development, AI Agents, AI Automation, AI Consulting · 3 documented client engagements with source URLs · reviewed 2026-09-09 · https://www.aiagencies.eu/agency/fantasy-space
26. **Altar.io** — Lisbon, Portugal · rate not published · team 10-49 · founded 2015 · services: AI Development, AI Consulting, Generative AI · 2 documented client engagements with source URLs · reviewed 2026-09-09 · https://www.aiagencies.eu/agency/altar-io
27. **Sputnik Digital** — Manchester, United Kingdom · €85-130/hr (directory-listed) · team 2-9 · founded 1998 · services: AI Development, AI Consulting · 2 documented client engagements with source URLs · reviewed 2026-08-04 · https://www.aiagencies.eu/agency/sputnik-digital

## Compared head-to-head
Curated comparison pages (published rates, team size, coverage, projected 12-week engagement cost, and the curator's verdict on both sides — pairings are never sold):
- Buildo vs xtream: https://www.aiagencies.eu/compare/buildo-vs-xtream

## About this market
When a software startup adds AI, the feature usually ships inside a product other people pay for, which makes cost per request and failure behavior part of the specification rather than the retrospective. The documented work here is mostly feature-in-product delivery. Buildo built a Conversation Intelligence module into Superlayer's B2B sales platform—call recording, transcription and LLM-extracted insight—and chose Valohai over SageMaker and Kubeflow for Freeda Media's MLOps, publishing the comparison. xtream launched Credimi Assist in six weeks and built a mixed-integer-programming solver behind WeRoad's departure planning. Sputnik Digital built Invntry's image identification on a model-agnostic layer, which is the design decision that matters most when prices move. Dashbouquet and Lizard Global both work the application layer around models the client licenses, and Valletta Software Development embeds a single engineer to wire an LLM or agent into a small company's existing tools, with its most detailed production write-ups published without a client name.

Three questions protect a SaaS buyer here. What runs without the agency—a feature only the vendor can operate is a liability at diligence. What does it cost per request at ten times your current volume, since AI features are the first line item to break a gross-margin model. And how is the model swapped: teams that built against an abstraction rather than a single provider say so immediately, and the ones that did not discover the cost of it on the next price change.

## Questions buyers ask

### How many AI agencies work with startup on saas & b2b?
27 agencies in our directory combine verified startup client evidence with documented SaaS & B2B work. The current top-ranked are Old St Labs, Square Root Solutions, Pixelette Technologies — 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 for saas & b2b?
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.

### 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?
8 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.

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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