Accessibility, sometimes abbreviated to a11y, is an essential component of modern technology development that ensures products and services can be used by everyone, regardless of their physical or cognitive abilities. It is about creating inclusive solutions that remove barriers and provide equal access to information and functionality for people with disabilities. Accessibility is not only an ethical obligation but also a legal and commercial necessity that can improve the user experience for everyone.
Applying accessibility principles in design and development helps to ensure that technological solutions are user-friendly and effective for a broad audience. This includes everything from support for screen readers and text-to-speech features to colour contrast and navigation options adapted to different needs.
Accessibility is an essential component of modern technology development that ensures products and services are usable by everyone, regardless of their physical or cognitive abilities. It is about designing apps and web platforms that are intuitive and inclusive by supporting features such as screen readers, keyboard navigation and adjustable font sizes. Prioritising accessibility helps to create a more equal digital world in which all users can interact with technology in a meaningful way. This is not only an ethical obligation but also a strategic advantage, as it broadens the user base and improves the overall user experience.
More about Accessibility
Accessibility is an essential discipline within technology development that focuses on making software and hardware accessible to all users, including people with various forms of disability. The aim is to ensure that everyone can interact with and benefit from technological solutions without barriers, which is crucial for inclusion and equality in the digital society.
Technically, accessibility involves applying standards and guidelines, such as WCAG (Web Content Accessibility Guidelines), which ensure that web content is structured in a way that is perceivable, operable, understandable and robust for people with impaired vision, hearing, motor skills or cognitive abilities. In practice, this can include support for screen readers and keyboard navigation, text alternatives for images and audio, and adjustable font sizes and contrast.
Accessibility can be divided into three main areas, each supporting different aspects of user interaction:
Perceptual accessibility: This area focuses on making content visible and audible to users with sensory disabilities. It can include text descriptions for images, captions for videos and audio, and the use of colours and contrasts that are easy to distinguish for people with colour blindness, without relying on colour alone to convey information.
Operational accessibility: Here, the aim is to ensure that users can navigate and interact with technology using different input methods. This can include keyboard navigation, voice commands and alternative input devices for people with motor impairments.
Cognitive accessibility: This aspect focuses on making content understandable and user-friendly for people with cognitive or learning difficulties. It can involve using clear language, structuring information logically and using visual aids to aid understanding.
WCAG also includes a fourth principle, robustness, which means that content must work reliably with different browsers and assistive technologies. One of the greatest strengths of accessibility is its ability to improve the user experience for everyone, not only people with disabilities. By applying accessibility principles, developers can create more intuitive and user-friendly products that are easier for all users to navigate and understand. This can also lead to increased user engagement and satisfaction.
Accessibility is also an important factor in complying with legislation and standards. Many countries have adopted laws requiring digital products and services to be accessible to people with disabilities. Complying with these rules can not only avoid legal problems but also open up a broader market of users.
In practice, accessibility has changed how technology is designed and developed. It has contributed to innovations such as screen readers and voice control that help people with impaired vision and advanced text-to-speech systems that enable people with reading difficulties to access information. Accessibility has also promoted the development of universal design, in which products are created to be usable by as many people as possible without the need for adaptation.
In summary, accessibility is a discipline that combines technical expertise, user-centred design and ethical responsibility to create inclusive technological solutions. Its focus on removing barriers and promoting equality makes it an essential part of the modern digital world, in which everyone should be able to participate in and benefit from technological progress.
Frequently asked questions about Accessibility
How can an app be made accessible to users with visual impairments?
To ensure that an app is accessible to users with visual impairments, it is important to make it possible for these users to navigate and interact with the app without visual assistance. This is achieved by making the app compatible with the operating system’s screen readers, such as VoiceOver on iOS and TalkBack on Android, which read text aloud. The app must provide meaningful labels and descriptions for buttons, images and other visual elements, and a logical reading order, so that the screen reader can describe them correctly.
In addition, the app should support magnification tools, the system’s text size settings, such as Dynamic Type on iOS, and high-contrast modes, which help users with low vision by enlarging text and images and improving the contrast between text and background. This ensures that the content is easier to see and understand for users with varying degrees of visual impairment.
Compared with apps that do not take accessibility into account, an app with these features offers a far more inclusive user experience, as it actively meets the needs of users with visual impairments and thereby promotes equal access to technology.
Which tools and technologies can improve accessibility in web apps?
To improve accessibility in web apps, the first step is to use semantic HTML elements, such as real buttons, headings and form labels, which assistive technologies understand automatically. Where these are not sufficient, ARIA (Accessible Rich Internet Applications) can be used. ARIA attributes can be added to HTML elements to give screen readers extra semantic information, enabling users with visual impairments to navigate and interact with web apps more effectively. Incorrect use of ARIA can, however, make accessibility worse.
In addition, tools such as Lighthouse, an open-source automated tool from Google, and axe can be used to evaluate and improve the accessibility of web apps. Lighthouse generates reports and recommendations that can be used to identify and fix accessibility problems, helping web apps to meet the WCAG (Web Content Accessibility Guidelines) standards.
Automated tools are faster than manual testing but can only detect some of the problems; issues such as whether alternative text is meaningful or whether a flow makes sense with a screen reader require manual testing. Combining tools and manual testing therefore gives the most reliable result, improving the user experience and supporting compliance with legal requirements and industry best practice in accessibility.
How is an app tested to ensure that it meets the WCAG standards?
To ensure that an app meets the WCAG (Web Content Accessibility Guidelines) standards, it is important to carry out a series of tests that focus on accessibility and the user experience for people with various disabilities. These tests should be carried out regularly throughout the development process to identify and fix potential accessibility problems early.
An effective method of testing for WCAG compliance is to use automated tools that can scan the app’s code for common accessibility errors. These tools can quickly identify problems such as missing alternative text for images, insufficient colour contrast and missing keyboard navigation. Automated tests are, however, only part of the solution, as they cannot detect all types of accessibility problems.
In addition, it is crucial to carry out manual tests, including with real users with disabilities, to obtain direct feedback on the app’s accessibility and usability. This can include user tests with screen readers, magnification tools and other aids used by people with visual impairments. Observing how these users interact with the app makes it possible to identify areas that need improvement.
Compared with traditional test methods, which often focus on functionality and performance, WCAG testing requires a more holistic approach that takes different user needs and preferences into account. Integrating accessibility tests into the development process helps to ensure that the app not only meets the WCAG standards but also delivers an inclusive and satisfying experience for all users.
Which design principles should be followed to create an inclusive user experience?
To create an inclusive user experience, it is crucial to follow design principles that ensure accessibility and usability for all users, regardless of their physical or cognitive abilities. This involves designing with a focus on universal access, in which all elements of a platform are easy to access and understand for users with different needs.
In addition, the design should be flexible and adaptable so that it can meet individual preferences and needs. This can be achieved by supporting different methods of interaction, such as voice control, keyboard shortcuts and screen readers, enabling users to navigate and interact with the content in the way that suits them best.
Compared with traditional design methods, which often focus on an average user, inclusive design is far more effective at creating a positive user experience for a broader audience. Integrating accessibility from the start of the design process helps to ensure that all users, regardless of their abilities, can benefit from the technology and feel valued and included in the digital world.
How can accessibility features be integrated without compromising the app's performance?
Integrating accessibility features into an app rarely affects performance noticeably. Much of the work consists of providing correct labels, semantic structure, sufficient contrast and support for the system’s text size settings, which cost little or nothing in terms of resources.
Screen readers and text-to-speech are provided by the operating system and are only active when the user has switched them on. The app’s task is to expose the right information to these services, for example by using standard components, which already include accessibility support, rather than building everything from scratch.
Performance optimisation and accessibility generally support each other, as a fast and stable app is easier to use for everyone. Techniques such as lazy loading should, however, be implemented so that content loaded later is still announced to screen readers and can be reached with the keyboard. This ensures that the app remains responsive and fast while meeting the needs of all users.
Which legal requirements apply in relation to accessibility?
When it comes to accessibility, there are several legal requirements that companies and developers need to be aware of to ensure that their products and services are accessible to all users, including people with disabilities. The most prominent set of guidelines is WCAG (Web Content Accessibility Guidelines), developed by the W3C (World Wide Web Consortium), which offers a range of recommendations for making web content more accessible. The current version is WCAG 2.2, published in 2023.
WCAG is divided into three levels of conformance, A, AA and AAA, with AA usually being the level referenced by legislation. In the EU, the Web Accessibility Directive requires public-sector websites and apps to comply with the European standard EN 301 549, which is based on WCAG at level AA, and since 28 June 2025 the European Accessibility Act has also covered many private services, such as e-commerce, banking services and e-books. In the USA, the ADA (Americans with Disabilities Act) is applied to digital services, and since 2024 a rule has required state and local government websites and apps to meet WCAG 2.1 AA. The guidelines cover a wide range of aspects, including text alternatives for non-text content, accessible navigation and the use of colours that are easy to distinguish for people with visual impairments.
In addition, it is important to be aware of national laws that can affect accessibility requirements, such as the UK’s Equality Act 2010, which requires organisations to make reasonable adjustments so that their services are accessible to people with disabilities. By complying with these guidelines and laws, companies can not only avoid legal problems but also improve the user experience for all their customers, which can lead to greater customer satisfaction and loyalty.
Accessibility for dummies
Accessibility is about making technology easier to use for all people, regardless of their abilities or limitations. Think of it as building a ramp next to a staircase so that people in wheelchairs can also get into a building. In the same way, accessibility in technology makes sure that everyone can use an app or a website, whether they have impaired vision, hearing or motor skills. This can be features such as text-to-speech, which reads the text on the screen aloud, or the option to navigate with the keyboard instead of a mouse. The goal is to make sure that technology is inclusive and accessible to everyone, so that no one is left on the sidelines.
