tetralogical
TetraLogical is a London-based boutique consultancy that helps organizations make their websites, apps, and digital products accessible to people with disabilities through WCAG assessments, design reviews, usability testing, and inclusive user research.
- Company typePrivate
- Founded2019
- HeadquartersLondon, United Kingdom
- Headcount1–10
- GTM typeB2B
- OfferingServices
What tetralogical does
TetraLogical (legally TetraLogical Services Ltd., UK company number 12951928) is a boutique accessibility consultancy headquartered in London that helps organizations make their websites, mobile applications, design systems, and other digital products usable for people with disabilities. The firm was founded in 2019 and operates with a team of approximately 16 specialists whose capabilities span accessibility assessments against Web Content Accessibility Guidelines (WCAG), expert design reviews, agile usability testing with participants who have disabilities, and inclusive user research mentoring that emphasizes trauma-informed approaches for vulnerable participants.
The core 'technology' underpinning the business is codified human expertise rather than proprietary software: deep specialisms in screen readers, Accessible Rich Internet Applications (ARIA), WCAG conformance methodologies, and inclusive design principles. Distribution is sales-led and direct — prospective clients reach out via a single email address ([email protected]) — and is positioned as global rather than UK-restricted, despite the London headquarters. Marketing is built around a content engine of regular blog posts (including a sustained 'Designing for disabilities' series running through 2026) and a free six-day 'Accessibility Unlocked' newsletter used as a top-of-funnel lead generation tool.
Commercially, the firm is a private, founder-led professional services business with no disclosed funding, no parent company, and no publicly disclosed revenue or pricing. Revenue derives from project-based accessibility consulting engagements. The customer base is horizontal — organizations that operate digital products — with one publicly visible reference client (Delib). Leadership includes Director Steve Faulkner, an ARIA and screen reader specialist, alongside an associate bench that includes specialists such as Niamh Madden.
tetralogical firmographics
Firmographics- Name
- tetralogical
- Legal name
- TetraLogical Services Ltd.
- Website
- https://tetralogical.com
- Company type
- Private
- Founded year
- 2019
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- TetraLogical is a London-based boutique consultancy that helps organizations make their websites, apps, and digital products accessible to people with disabilities through WCAG assessments, design reviews, usability testing, and inclusive user research.
- Ownership category
- akta.pro rank
tetralogical industry classification
Industry- Product category
- Accessibility Consulting Services
- NAICS
- Educational Support Services (611710)
- SIC
- Services-Management Consulting Services (8742), Services-Educational Services (8200)
- akta.pro primary industry
- Digital Accessibility & Web/App Compliance (WCAG) (EDALAGAG)
- akta.pro secondary industry
- School Accessibility Audits & ADA/IDEA Compliance Consulting (Transportation & Access) (EDAKAOAK)
Keywords
Where tetralogical is headquartered
LocationHeadquarters
- HQ city
- London
- HQ country
- United Kingdom
- HQ region
- Europe
Offices1 record
Markets served
tetralogical business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Marketing or Sales, Technology or R&D
Revenue model
- Accessibility Consulting Services: Professional services including accessibility assessments, design reviews, user research, and consulting engagements to help organizations make their digital products accessible.
Go-to-market motion1 record
Distribution channels1 record
Marketing channels2 records
tetralogical product offering
Product offeringCore offering
TetraLogical is a boutique accessibility consulting firm that helps organizations make their websites, mobile applications, and digital technologies accessible to people with disabilities. The firm delivers expert accessibility assessments against WCAG standards, design reviews to catch issues early, agile usability testing with participants who have disabilities, and mentoring for inclusive user research. They also offer a free educational newsletter series (Accessibility Unlocked) to help organizations kick-start their accessibility journey.
Product overview
TetraLogical is a boutique accessibility consulting firm that provides a comprehensive suite of services to help organizations make their digital products accessible. Their core offerings include Accessibility Assessments for evaluating websites, apps, and design systems against WCAG standards; Design Reviews to catch accessibility issues early in the design process; Agile Usability Testing with participants who have disabilities; and Inclusive User Research Mentoring to train teams on accessibility-focused research methods. They also offer educational resources including the free Accessibility Unlocked newsletter. The company operates as a services business rather than a software product company, focusing on human expertise, guidance, and knowledge transfer rather than automated tools or platforms.
Differentiator
Problem solved
Functional benefit
Products and services
- Accessibility Assessments Professional evaluation of websites, mobile applications, design systems, and other digital products against Web Content Accessibility Guidelines (WCAG) standards to identify accessibility barriers and compliance gaps. Targeted at organizations developing or maintaining digital products.
- Design Reviews Expert accessibility review of design systems and UI/UX designs to identify and address accessibility issues before development begins. Targeted at design and product teams.
- Agile Usability Testing Inclusive usability testing services that incorporate participants with disabilities to ensure digital products work effectively for all users. Targeted at product teams seeking to validate accessibility through real user testing.
- Inclusive User Research Mentoring Training and mentorship for researchers on how to effectively conduct user research sessions with participants who have disabilities. Targeted at in-house research teams seeking to build accessibility research capabilities.
Quantifiable outcome
- Organizations gain ability to meet accessibility compliance requirements and create inclusive digital experiences
Companies that use tetralogical
Customer profileNamed customers1 record
Segments1 record
Ideal customer profiles1 record
tetralogical technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
tetralogical partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- DelibminorDelib appears as a client logo on the TetraLogical website, indicating they have received accessibility services from TetraLogical.
Scale indicators1 record
Recent moves5 records
Expansion highlights5 records
tetralogical competitors and assessment
Company assessmentDirect peers
- Fable: Fable is a digital accessibility company that connects organizations with people with disabilities for user research and platform-based testing. It is highly comparable to TetraLogical's inclusive user research and agile usability testing services and competes directly for accessibility-focused research engagements.
- Level Access: Level Access is a leading digital accessibility consultancy offering WCAG audits, design reviews, and enterprise accessibility programs. It is one of the closest direct competitors to TetraLogical across WCAG compliance and design review services.
- Deque Systems: Deque Systems is a major accessibility consultancy and tooling provider focused on WCAG conformance, ARIA, and inclusive design. It directly competes with TetraLogical on enterprise accessibility audits and design reviews while also offering an automated testing platform.
- TPGi (The Paciello Group): TPGi is a well-known accessibility consultancy specializing in WCAG audits, ARIA, and assistive-technology testing. It competes with TetraLogical for the same pool of digital accessibility engagements and has a similar specialist-consulting model.
- AbilityNet: AbilityNet is a UK-based accessibility charity and consultancy providing WCAG audits, training, and disability user testing. As a fellow UK specialist, it is the closest geographic peer to TetraLogical and serves overlapping enterprise and public-sector clients.
- AccessibilityOz: AccessibilityOz is a digital accessibility consultancy offering WCAG audits, VPAT creation, and remediation services. It is a direct competitor to TetraLogical in WCAG-focused consulting engagements for organizations with digital products.
Broad incumbents
- AudioEye: AudioEye is a publicly traded digital accessibility platform combining automated remediation with human-expert audits. It overlaps with TetraLogical's audit and remediation services but operates at much larger scale with both a software platform and professional services.
- Siteimprove: Siteimprove offers a broader digital quality platform that includes accessibility scanning alongside SEO and content quality. It competes with TetraLogical on the accessibility-audit buying motion, particularly with enterprise digital teams that prefer integrated SaaS tooling.
Emerging players
- UserTesting: UserTesting is a large-scale usability and user-research platform that increasingly supports accessibility-focused research and inclusive participant panels. It is an emerging competitor to TetraLogical's inclusive user research and agile usability testing services at enterprise scale.
Others
- RNIB (Royal National Institute of Blind People): RNIB is a UK charity that provides accessibility expertise, training, and consultancy for blind and partially sighted users. It is adjacent to TetraLogical rather than a direct competitor but addresses overlapping client needs in the UK market, particularly for organizations seeking specialist sight-loss guidance.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat3 records
Key risks6 records
Key highlights5 records
Customer concentration
tetralogical social profiles
Digital presencetetralogical financial estimates
Financial estimateRevenue estimate
Valuation estimate
tetralogical leadership team
Management profileNumber of profiles
Profiles3 records
tetralogical funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
tetralogical M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about tetralogical
What does tetralogical do?
TetraLogical is a boutique accessibility consulting firm that helps organizations make their websites, mobile applications, and digital technologies accessible to people with disabilities. The firm delivers expert accessibility assessments against WCAG standards, design reviews to catch issues early, agile usability testing with participants who have disabilities, and mentoring for inclusive user research. They also offer a free educational newsletter series (Accessibility Unlocked) to help organizations kick-start their accessibility journey.
Is tetralogical a public or private company?
tetralogical is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was tetralogical founded?
tetralogical was founded in 2019. It employs 1 to 10 people.
Where is tetralogical based?
tetralogical is headquartered in London, United Kingdom, in the Europe region.
How does tetralogical make money?
One revenue line is on record: accessibility Consulting Services.
Who are tetralogical's main competitors?
Direct peers on record are Fable, Level Access, Deque Systems, TPGi (The Paciello Group), AbilityNet and AccessibilityOz. Broad incumbents are AudioEye and Siteimprove. UserTesting is listed as an emerging player. RNIB (Royal National Institute of Blind People) is listed as an others.
Does tetralogical have an API?
No public API is recorded for tetralogical.
What industry is tetralogical in?
tetralogical's product category is Accessibility Consulting Services. Its primary akta.pro industry code is EDALAGAG, Digital Accessibility & Web/App Compliance (WCAG), with a secondary code of EDAKAOAK, School Accessibility Audits & ADA/IDEA Compliance Consulting (Transportation & Access). Its NAICS code is 611710 and its SIC code is 8742.