Hello, we’re TetraLogical

We're a company with inclusion at its heart. We specialise in all aspects of accessibility, from working with your websites and apps to giving your teams the skills they need to make accessibility part of everything they do.

We take the time to understand your organisation, your project, and your goals, so we can put together services that are tailored to suit you. Our accessibility services include:

TetraLogical is a member of the W3C where we contribute to standards including HTML, CSS, ARIA, and WCAG.

We're proud to work with organisations including the Scottish Government, Herbal Essences, Google, Babylon Health, Wiley Publishing, and Middlesex University.


Interaction media and their potential (for incorrect assumptions)

Patrick H. Lauke, Accessibility Specialist at TetraLogical, writes on CSS-Tricks about the Media Queries Level 4 interaction media features hover, pointer, any-hover, and any-pointer.

Read Interaction media features and their potential (for incorrect assumptions)

Representative samples for accessibility assessments

When a website is assessed using the Web Content Accessibility Guidelines (WCAG), it is rarely feasible to test every single page. Instead, the assessment can be based on a sample of pages that are representative of the website as a whole. This article explains what a representative sample is and what it involves.

Read Representative samples for accessibility assessments.

Introducing TetraLogical video

Léonie Watson, Director at TetraLogical, introduces the founding principles and philosophy of the company in a short video, also available with extended audio description.


Contact us

We like to listen. If you have a project, product, problem, or idea that you want to discuss we can be found at hello@tetralogical.com