In 2026, accessibility tools differ primarily in four areas:
- Depth of testing
- Standards covered
- Scalability
- Value for money
For agencies and compliance teams, it is crucial that a tool fully covers WCAG 2.2 and BITV, can monitor websites on an ongoing basis, and provides clear recommendations for action. The following questions will help you make the right choice for your specific use case.
What criteria are key when comparing accessibility tools?
When comparing accessibility tools, the most important criteria are: coverage of the relevant standards (WCAG, BITV, BFSG), depth of testing including subpages, quality of recommendations for action, the ability to carry out continuous monitoring, reporting functions and value for money. For professional users, white-label features, API access and multilingual support are also important.
A good accessibility tool should not only identify technical errors but also prioritise them according to severity. Only then can you, as an agency or compliance officer, efficiently decide which barriers need to be addressed first. Check whether the tool merely checks the home page or also covers subpages and password-protected areas, as many critical accessibility issues are hidden within product pages, forms or login areas.
For consultants managing multiple client projects, the documentation function is also crucial: can reports be shared directly with clients? Can manual test results be incorporated into the report? These questions distinguish professional accessibility software from simple one-off checks.
In our blog post The Best Accessibility Testing Tools of 2026, we introduce providers of accessibility software and explore the question: Which tool really suits your business model?
What do automated accessibility tools check compared to manual audits?
Automated accessibility tools check the technical and structural aspects of a website. They reliably identify issues with alt text, colour contrast, ARIA attributes, focus and incorrectly structured HTML. Manual audits complement this process by adding content-related and context-specific checkpoints that cannot be detected automatically.
What automated tools reliably detect
Automated accessibility scans cover a wide range of technical barriers. These include missing or empty alt text for images, insufficient colour contrast between text and background, incorrect use of ARIA roles and attributes, and form fields without corresponding labels. These errors can be checked programmatically and are therefore ideally suited to automated WCAG testing. Typically, good tools cover dozens of different types of barriers. Ideally, the findings are aggregated and the accessibility issues are assessed.
What manual checks must additionally achieve
Certain aspects of accessibility cannot be automated. Whether alt text is semantically meaningful, whether all navigation elements are accessible via the keyboard, or whether the visual order of page elements matches the HTML structure requires human judgement. The same applies to the comprehensibility of text or the accessibility of PDF documents. A good risk score in an automated scan is therefore a necessary but not sufficient condition for full accessibility. Professional tools make it possible to add the results of manual checks to the automated report in order to obtain a complete picture.
How do free and paid accessibility tools differ?
Free tools such as Lighthouse or WAVE are suitable for one-off, individual checks of a page. Paid accessibility software, on the other hand, offers comprehensive website scans across all subpages, monitoring, structured reports, documentation functions and specific recommendations for action, enabling a reliable service for clients.
For occasional personal use, a free web accessibility check may suffice. However, anyone wishing to regularly check websites for accessibility and document this in a legally compliant manner for clients will quickly find free solutions have their limitations: they lack an overall view across multiple pages, historical documentation and the ability to present reports professionally.
Whilst enterprise tools such as Siteimprove or Deque offer extensive functionality, they can quickly exceed the budgets of small agencies and compliance teams. Positioned in between are specialised solutions that combine professional audit depth with streamlined operation and reasonable costs. For a small agency, the cost of a professional tool can be recouped with just a single client project if accessibility audits are offered as a service.
Which accessibility standards should a tool cover in 2026?
In 2026, a professional accessibility tool should, at a minimum, fully cover WCAG 2.1 Level AA and support WCAG 2.2, as this standard forms the basis for the German Accessibility Enhancement Act (BFSG) and the European Accessibility Act (EAA). For the German market, the BITV 2.0 assessment is also relevant.
The Web Content Accessibility Guidelines (WCAG) are the internationally recognised standard for accessible websites. They are based on four fundamental principles: perceivability, operability, understandability and robustness. WCAG 2.2, the current version, comprises 13 guidelines with specific success criteria across three levels of conformance (A, AA, AAA). Level AA is generally the benchmark for the legal requirements under the BFSG.
Important to note: Passing an automated WCAG test does not automatically mean full legal compliance. Automated scans typically check a significant proportion of the technically measurable criteria, but cannot cover all requirements. A tool that provides transparent information about these limitations and allows for manual adjustments is preferable to dubious solutions that promise full compliance.
How can accessibility tools be used to monitor multiple websites simultaneously?
Professional accessibility software enables the monitoring of hundreds of websites via a central dashboard. Automatic notifications are triggered as soon as new barriers are detected or a website’s compliance status changes. This allows agencies and compliance teams to maintain an overview of all client projects without the need for manual intervention.
For agencies managing several client projects in parallel, this scalability is crucial. A solution that only allows individual scans forces manual repeat checks and makes systematic monitoring practically impossible. Good tools display each website’s risk score at a glance in the dashboard and document changes over time, so that you can provide clients with verifiable evidence of the progress of optimisation measures.
Other important features for multi-website monitoring include white-label reports, which you can deliver to clients under your own logo, as well as the ability to share reports directly. For more demanding requirements, a tool with a REST API and single sign-on support is recommended to integrate the solution into existing workflows.
Who should use a professional accessibility tool?
A professional accessibility tool is useful for web agencies, external data protection officers, compliance teams and all organisations that manage websites for third parties or are themselves subject to the requirements of the BFSG. Since the Accessibility Enhancement Act came into force, many organisations have been obliged to make their digital offerings accessible.
Web agencies face the challenge that their clients are increasingly demanding accessibility as part of web projects. Any agency unable to provide a well-founded response to WCAG requirements risks losing trust and contracts. A professional accessibility tool enables even smaller teams without in-depth accessibility expertise to advise clients competently and deliver verifiable results.
External data protection officers and compliance advisers benefit particularly when a tool combines accessibility and data protection within a single workflow. Instead of using various specialised solutions in parallel, both areas of compliance can be assessed, documented and communicated via a single platform. This saves time, ensures consistency and allows the consultancy portfolio to be expanded without significant additional effort.
How does decareto support you in testing the accessibility of your websites?
Here at decareto, we have developed accessibility software that is specifically tailored to the needs of agencies, external data protection officers and compliance teams. We deliberately avoid using overlay widgets and other superficial solutions, focusing instead on genuine error identification within the code and content.
- Full WCAG 2.1/2.2 and BITV compliance checks: Our tool detects dozens of types of accessibility issues, from missing alt text and ARIA errors to contrast problems, and prioritises them by severity.
- Subpages and password-protected areas: We scan not only the homepage but the entire website, including protected areas.
- Monitoring and automatic notifications: Hundreds of websites can be monitored continuously. New accessibility issues are reported immediately.
- Specific recommendations for action: Every issue found is accompanied by clear instructions on how to resolve it, understandable to developers and consultants alike.
- White-label reports: Reports can be delivered to clients bearing your own logo.
Combined with data protection: Accessibility and GDPR checks run within a single workflow, avoiding duplication of effort.
Get started now with a free trial and see for yourself how quickly you can generate a comprehensive accessibility report for one of your client projects. Try decareto now and professionally integrate accessibility into your compliance offering.
