Best AI Agent Development Companies in Europe

Vstorm vs Gradient Labs: full comparison for 2026

Last updated: August 2026

Quick verdict

Vstorm (4.6/5) edges ahead of Gradient Labs (4.3/5) overall. Vstorm is the better choice for eU mid-market buyers wanting a consultancy whose entire practice is agentic AI, with public EU AI Act commentary from its own founders.. Gradient Labs is the stronger option for uK and European financial-services firms wanting a narrow, deeply regulatory-fluent autonomous customer-operations agent.. The right choice depends on your project size, budget, and required tech stack.

Vstorm vs Gradient Labs: head-to-head summary

Criterion Vstorm Gradient Labs
Founded 2017 2023
HQ Wrocław, Poland London, UK
Team size 11–50 11–50
Rating 4.6 / 5 4.3 / 5
Best for EU mid-market buyers wanting a consultancy whose entire practice is agentic AI, with public EU AI Act commentary from its own founders. UK and European financial-services firms wanting a narrow, deeply regulatory-fluent autonomous customer-operations agent.
Pricing model Fixed project, dedicated team Retainer, platform licensing
Min. engagement Not published Not published
Primary tech stack Python, LangChain, LangGraph Python, LangChain, OpenAI
Industries served Technology & SaaS, Financial Services, Retail & E-commerce Financial Services, Banking

Vstorm vs Gradient Labs: overview

Vstorm

Vstorm is a Wrocław, Poland-based boutique founded in October 2017 by CEO Antoni Kozelski and VP Bartosz Gonczarek, with a compact team of 11–50 people, operating fully within the EU as an agentic AI engineering consultancy. It was the first AI consultancy accepted into the Agentic AI Foundation (AAIF) and publishes its own TriStorm delivery framework, with a public commitment to AGENTS.md documentation on every project. As a Polish company, it falls squarely under GDPR without any cross-border transfer questions for EU clients, and its founders speak and publish regularly on EU AI Act readiness specifically.

Gradient Labs

Gradient Labs is a London-based startup founded in 2023 by former Monzo Bank employees Dimitri Masin, Neal Lathia, and Danai Antoniou, with roughly 46 employees and $13M+ in Series A funding at a $60M valuation. Its flagship product, Otto, is an autonomous agent purpose-built for customer operations in regulated financial services, engineered to resolve complex queries end-to-end while maintaining compliance, reportedly achieving up to a 90% resolution rate with a 98% QA pass rate. Its narrow, financial-services-specific focus and UK domicile make it a fit for buyers wanting deep regulatory fluency over broad horizontal agent capability.

Services and capabilities: Vstorm vs Gradient Labs

Capability Vstorm Gradient Labs
Multi-agent orchestration
RAG / knowledge integration
Workflow & systems integration
Coding agents
Monitoring & anomaly detection
Customer-facing agents

Tech stack comparison: Vstorm vs Gradient Labs

Framework / platform Vstorm Gradient Labs
LangChain
LangGraph N/A
AutoGen N/A N/A
LlamaIndex N/A N/A
OpenAI
Anthropic Claude
Pinecone N/A N/A
AWS
Azure N/A N/A
Kubernetes N/A N/A

Pricing comparison: Vstorm vs Gradient Labs

Criterion Vstorm Gradient Labs
Minimum engagement Not published Not published
Engagement models Fixed project, Dedicated team Retainer
Rate transparency Minimum disclosed Minimum disclosed
Price tier Mid-market Mid-market

Target audience comparison: Vstorm vs Gradient Labs

Dimension Vstorm Gradient Labs
Best company size Startup to mid-market Startup to mid-market
Best industries Technology & SaaS, Financial Services, Retail & E-commerce Financial Services, Banking
Best use cases EU buyers wanting a vendor whose entire business is agentic AI, fully within EU jurisdiction, Teams wanting standardized AGENTS.md documentation baked into delivery for future maintainability Regulated financial-services firms wanting a purpose-built autonomous customer-operations agent, Banking or insurance clients needing compliance-fluent agent behavior out of the box
Typical project type Fixed project Retainer

Vstorm vs Gradient Labs: pros and cons

Vstorm
+ First AI consultancy formally accepted into the Agentic AI Foundation, an independently verifiable credential
+ Fully EU-domiciled (Poland), avoiding cross-border transfer complexity for European clients
+ Named proprietary delivery framework (TriStorm) gives buyers a concrete methodology to evaluate
+ Founders publish specifically on EU AI Act readiness, not just generic AI commentary
- 11–50 person team caps capacity for large or highly parallel programs
- Founded relatively recently (October 2017) relative to some longer-tenured European competitors on this list
- Minimum engagement figures are not published, requiring direct sales contact for early budgeting
Gradient Labs
+ Founding team's direct experience at Monzo (a regulated UK bank) feeds real compliance fluency into Otto
+ Named, benchmarked production agent with disclosed resolution-rate and QA-pass-rate figures
+ Venture-backed ($13M+ Series A) with runway to keep investing in the product
+ UK domicile with a narrow, deep focus on regulated financial services specifically
- Very narrow focus (financial-services customer operations) — not a fit for other verticals or broader custom agent builds
- Small team (~46 employees) limits capacity and account-management bandwidth
- As a product company rather than a services firm, engagement is closer to platform licensing than bespoke development

Who should choose Vstorm?

Vstorm is the right choice for eU mid-market buyers wanting a consultancy whose entire practice is agentic AI, with public EU AI Act commentary from its own founders..

First AI consultancy accepted into the Agentic AI Foundation, EU-domiciled, with founders who publish specifically on EU AI Act readiness.. Minimum engagement starts at Not published. Works best with clients in Technology & SaaS, Financial Services, Retail & E-commerce.

Who should choose Gradient Labs?

Gradient Labs is the right choice for uK and European financial-services firms wanting a narrow, deeply regulatory-fluent autonomous customer-operations agent..

Otto, a named production agent for regulated financial-services customer operations, built by founders with direct Monzo banking-compliance experience.. Minimum engagement starts at Not published. Works best with clients in Financial Services, Banking.

Decision matrix: Vstorm vs Gradient Labs

Your situation Recommended choice
You need full-ownership delivery on a defined project scope Vstorm
You need a large dedicated team for an ongoing programme Vstorm
Your budget is at the lower end Compare: Vstorm (Not published) vs Gradient Labs (Not published)
You need specialist depth in a specific vertical Vstorm
You need staff augmentation or team extension Neither; consider alternatives that offer staff aug
You need consulting before committing to a build Both may offer discovery engagements

Use case fit: Vstorm vs Gradient Labs

Use case Vstorm fit Gradient Labs fit Winner
EU buyers wanting a vendor whose entire business is agentic AI, fully within EU jurisdiction Strong Limited Vstorm
Teams wanting standardized AGENTS.md documentation baked into delivery for future maintainability Strong Limited Vstorm
Regulated financial-services firms wanting a purpose-built autonomous customer-operations agent Limited Strong Gradient Labs
Banking or insurance clients needing compliance-fluent agent behavior out of the box Limited Strong Gradient Labs
Fixed-price build Limited Limited Both equally
Staff augmentation Limited Limited Both equally

Verdict: Vstorm vs Gradient Labs

Vstorm (4.6/5) is the stronger overall choice for most AI Agent Development projects. First AI consultancy accepted into the Agentic AI Foundation, EU-domiciled, with founders who publish specifically on EU AI Act readiness.. It is best for eU mid-market buyers wanting a consultancy whose entire practice is agentic AI, with public EU AI Act commentary from its own founders..

Gradient Labs (4.3/5) is the better choice when uK and European financial-services firms wanting a narrow, deeply regulatory-fluent autonomous customer-operations agent.. If your situation matches those criteria, Gradient Labs is a competitive option.

Related comparisons

Vstorm vs Gradient Labs FAQ

Is Vstorm better than Gradient Labs?

Vstorm (4.6/5) scores higher overall, but "better" depends on your use case. Vstorm is better for eU mid-market buyers wanting a consultancy whose entire practice is agentic AI, with public EU AI Act commentary from its own founders.. Gradient Labs is better for uK and European financial-services firms wanting a narrow, deeply regulatory-fluent autonomous customer-operations agent..

How do Vstorm and Gradient Labs differ in pricing?

Vstorm uses fixed project, dedicated team pricing with a minimum engagement of Not published. Gradient Labs uses retainer, platform licensing pricing with a minimum engagement of Not published. Neither firm publishes a full rate card; a discovery call is required for project-specific quotes.

Which is better for enterprise: Vstorm or Gradient Labs?

Vstorm is the larger team and typically the better enterprise-scale choice. For very large programmes, verify team size and compliance coverage directly with each company before shortlisting.

What are the main differences between Vstorm and Gradient Labs?

Vstorm's primary differentiator is: first ai consultancy accepted into the agentic ai foundation, eu-domiciled, with founders who publish specifically on eu ai act readiness.. Gradient Labs's primary differentiator is: otto, a named production agent for regulated financial-services customer operations, built by founders with direct monzo banking-compliance experience.. They also differ in team size (11–50 vs 11–50), minimum engagement (Not published vs Not published), and primary industries served (Technology & SaaS, Financial Services vs Financial Services, Banking).

Last reviewed: August 2026. Verify all details directly with each company before making a decision.