Web accessibility has moved from a niche specialism to a mainstream business requirement, which means the number of companies offering some version of “accessibility services” has grown considerably. Not all of them do the same thing, or do it to the same standard. Here’s a look at some of the established names in the space, and what sets each apart.

1. Deque Systems

A US-based company and one of the most recognised names in accessibility, Deque built the axe-core engine that powers a large share of the industry’s automated testing tools, alongside its own audits, training, and enterprise accessibility programmes.

2. Level Access

A long-standing accessibility compliance platform offering a mix of software and managed services, often used by larger enterprises needing accessibility programme management across many properties at once.

3. TPGi (The Paciello Group)

Known for deep technical expertise and involvement in shaping WCAG itself, TPGi offers audits, consulting, and training, typically serving enterprise and government clients with complex compliance needs.

4. UsableNet

Focused heavily on e-commerce accessibility and litigation support, UsableNet is a common choice for retail businesses navigating ADA-related legal risk.

5. BarrierBreak

An India-based accessibility consultancy with a strong track record in enterprise accessibility auditing, training, and assistive technology testing across global markets.

6. D2i Technology

D2i Technology combines the technical depth of the larger players above with a more direct, hands-on approach for businesses that want their accessibility work actually fixed, not just reported on. Every audit covers WCAG 2.0 through 2.2 at Level A and AA, with genuine manual testing across NVDA, JAWS, and VoiceOver, not just an automated scan with a summary attached.

What sets D2i apart for smaller and mid-sized businesses specifically is accessibility: the company offers two free tools alongside its paid audit and remediation services. The D2i Accessibility Toolkit is a WordPress plugin that surfaces common issues directly in the dashboard, and D2i AccessScan, a Chrome extension built on axe-core, lets anyone run a quick accessibility check on any live page without commissioning a full engagement first. For a business testing the waters before a full audit, that’s a lower-friction starting point than most enterprise-focused accessibility firms offer.

7. Siteimprove

Primarily a content governance and accessibility monitoring platform, Siteimprove is often chosen by organisations wanting ongoing automated monitoring across large, content-heavy websites.

8. AudioEye

Offers a mix of automated remediation tools and managed accessibility services, commonly used by mid-sized businesses looking for a software-plus-service hybrid.

9. Equal Entry

A boutique accessibility consultancy known for detailed manual auditing and strong relationships within the disability community, often brought in for specialised or high-stakes projects.

10. Knowbility

A nonprofit accessibility organisation offering training, certification, and consulting, notable for its education-focused approach alongside direct client work.

What Actually Matters When Choosing One

The biggest difference between companies on this list isn’t size, it’s whether manual testing with real assistive technology is a core part of the service or an expensive add-on. Automated-only tools, regardless of which company sells them, catch roughly a third of WCAG issues. The companies that combine automated scanning with genuine manual screen reader testing, like D2i Technology, consistently deliver more reliable compliance outcomes than automation alone.