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Grounded AI for legal, finance and education

4xxi builds AI products on your own trusted content: systems that cite the exact source for every answer and say "no answer" instead of guessing. We work with legal, financial and education organizations, where a wrong answer has a real cost.

  • Min project size
    $10,000+
  • Hourly rate
    $200 - $300 / hr
  • Employees
    2 - 9
  • Locations
    Richmond, England
  • Year founded
    Founded 2008

Overview by:

Reviewer avatar
Evgeny Smirnov
Founder and Lead AI Engineer About the Team

1 Locations

  • Richmond , England

Select Focus Area
Application Platforms
Amazon Application Development Framework
40%
Heroku
20%
AI Technologies & Models
Open AI GPT-3
40%
Anthropic
30%
Cohere
10%
Facebook OPT
10%
Hugging Face Bloom
10%
Digital and IT Strategy Consulting Focus
IT Operations Management Consulting
50%
IT Assessment
20%
Frameworks and CMS
Programming & Scripting
PHP
50%
Ruby
30%
Industries
Legal
35%
Financial services
30%
Education
25%
Information technology
10%
Clients
Midmarket ($10M - $1B)
40%
Small Business (<$10M)
40%
Enterprise (>$1B)
20%

Pricing Snapshot

Min. project size $10,000+
Avg. hourly rate $200 - $300 /hr
Rating for cost 4.8 /5

What Clients Have Said

4xxi offers competitive pricing, with project costs ranging from $17,250 to over $240,000 depending on scope. Clients highlight their exceptional value for cost, with many noting significant savings compared to onshore alternatives. Their commitment to quality and timely delivery enhances their overall value proposition.

This summary is based on verified Clutch reviews.

Most Common Project Size

$50,000 - $199,999 based on 9 reviews
< $49,999 $50,000 - $199,999 $200,000 - $999,999 > $1,000,000

Select a service to see pricing information

Highly Rated Similar Providers

4xxi Review Insights

Overall Review Rating

4.9
  • Quality 4.9
  • Schedule 4.8
  • Cost 4.8
  • Willing to Refer 4.9

Top Mentions

Review Highlights

  • High-Quality Deliverables

    Clients consistently report satisfaction with the quality of 4xxi's work. The company is recognized for delivering polished, functional, and well-tested products that meet or exceed expectations.

  • Expertise in Diverse Industries

    4xxi has demonstrated capability across various sectors, including finance, education, and technology. This broad expertise allows them to tailor solutions effectively to different business needs.

  • Challenges with Project Management Turnover

    One client reported initial difficulties with project management turnover, which caused challenges until the right fit was found. Since then, the project management has been stable and effective.

  • Commitment to Client Success

    Reviews highlight 4xxi's dedication to client projects. Their commitment is evident in their drive to understand client needs thoroughly and their enthusiasm for delivering high-quality products.

  • Responsive and Available Team

    4xxi is noted for their responsiveness and availability, making communication smooth and effective. Clients feel supported and valued, with the team consistently available to address concerns and provide updates.

  • Competitive Pricing and Value

    Many clients highlight the cost-effectiveness of working with 4xxi, noting that their services provide significant value for money compared to other options, particularly U.S.-based companies.

4xxi Reviews

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Services
Project Cost
Industry
Location

Web Dev for Online Learning Development Site

  • Web Development
  • $10,000 to $49,999
  • Mar. 2017 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
4.0
Willing to Refer
5.0

“It’s been a really good relationship so far, and we consider them partners.”

Aug 23, 2017
Manager of Digital Projects, Smart School
Konstantin Seregin
Verified
  • Education
  • Irkutsk, Russia
  • Phone Interview
  • Verified

4xxi used Scrum methodology to map out and design an e-learning website which they are currently developing.

HR Tool Development for Travel Industry Firm

  • Web Development
  • Confidential
  • Nov. 2016 - Ongoing
4.5
Quality
4.5
Schedule
4.5
Cost
4.5
Willing to Refer
4.0

“So far, new and complex features are delivered according to our specifications.”

Aug 14, 2017
Organizational Solutions Team, Travel Industry Firm
Anonymous
Verified
  • Hospitality & leisure
  • Germany
  • 1,001-5,000 Employees
  • Online Review
  • Verified

4xxi augments an internal team in creating custom HR solutions, including a recruitment tool that streamlines the application process. 4xxi helps with both development and testing.

Web Dev for Competition Website

  • Web Development
  • $10,000 to $49,999
  • Dec. - Jan. 2015
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

“I haven’t given them a project yet that they couldn’t handle… they’ve always delivered.”

Aug 9, 2017
Founder, Circus Intersection
David Nadezhdin
Verified
  • Advertising & marketing
  • Montreal, Quebec
  • 1-10 Employees
  • Online Review
  • Verified

4xxi used PHP and HTML5 to rapidly develop the front and backend of an application compatible for desktop, tablet, and mobile. This involved creation of a unique visual algorithm and server infrastructures.

Showing 11-13 of 13 Reviews

Our Story

4xxi was founded by a scientist, and we still work like one: measure first, then build. Our engineers have worked together since 2008 and shipped 100+ products. We believe AI should earn trust, so our systems cite their sources and say "no answer" rather than guess. We stay small and senior on purpose, dive into each client's domain before writing code, and take responsibility for everything we ship. Several clients have stayed with us for over a decade.

Meet the Team

Evgeny Smirnov

Evgeny SmirnovFounder and Lead AI Engineer

Founder and lead engineer of 4xxi, 20 years in software. Working with ML since 2012 and LLMs since 2022, he designed the grounded retrieval architecture behind AAAi ChatBook and Edtek. PhD in mathematics and physics, researching machine learning for

Egor Tomilin

Egor TomilinArchitect and AI Developer

Egor joined 4xxi in 2014 as a back-end developer, led the engineering team, became CTO in 2017. He still designs and builds the systems he is responsible for, with 18 years in software development, from back ends and to AI applications.

Nigel Hopkinson

Nigel HopkinsonDirector

Director of 4xxi since 2018. Previously CEO and VP of Sales at Intuit Services (Europe), SealedMedia and Office Shadow, leading them through one IPO and two acquisitions, then sales director for banking and insurance at SAS.

What Sets Us Apart

Grounded by design

Our AI systems answer only from your verified content, cite the exact source for every claim, and return "no answer" when the data is insufficient. This is how AAAi ChatBook works for the American Arbitration Association.

Fast start, fast prototypes

Kickoff within 3 business days of signing. A deployable prototype in 5 business days. A small senior team means no ramp-up and no handoffs between layers of management.

Low-risk first step

Start with a 2-week Grounded AI audit: accuracy measured on your own data and a concrete plan, or 100% of the fee back. The full fee is credited toward a project signed within 60 days.

Locations (1)

23 Leyborne Park, Kew Gardens, Richmond, Surrey, United Kingdom Richmond, England TW9 3HB

2 - 5

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