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How can you design mobile apps that are compatible with braille displays?

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Braille displays are devices that allow blind or visually impaired users to read text on a mobile screen by translating it into tactile dots, as well as input text with a braille keyboard. To design mobile apps that are compatible with braille displays, it is necessary to adhere to accessibility guidelines and best practices. This article will explain how to test your app with a braille display, use accessibility labels and hints, support dynamic text and font sizes, provide audio feedback and captions, and avoid complex gestures and layouts.

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1 Test your app with a braille display

The first step to design mobile apps that are compatible with braille displays is to test your app with a real device or an emulator. This will help you identify any issues or barriers that might prevent users from accessing your app's content and functionality. You can use various tools and platforms to test your app with a braille display, such as VoiceOver on iOS, TalkBack on Android, or NVDA on Windows. You should also consult with actual users who use braille displays and get their feedback and suggestions.

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Chintan Khetiya

Web & Mobile | Technical Architect | CSM? | Google Certified Project Manager | Product Management
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One of my best learning on this area on both platforms involves a commitment to accessibility and inclusive design. For Android, developers should leverage the TalkBack screen reader and ensure that app interfaces are structured with content descriptions for all elements. Implementing accessibility services and features, such as focus indicators and touch exploration, enhances the usability of the app for users relying on braille displays. On iOS, VoiceOver is a critical accessibility tool, and developers should focus on providing comprehensive accessibility labels, hints, and traits for UI elements. Utilizing dynamic text and supporting the Dynamic Type feature on iOS allows users to adjust text size according to their preferences.

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2 Use accessibility labels and hints

Accessibility labels and hints are text descriptions that tell users what an element on the screen does or represents. They are read by the braille display when the user navigates through the app. You should use clear and concise accessibility labels and hints for all the interactive elements in your app, such as buttons, icons, links, images, and forms. You should also avoid using generic labels like "button" or "image", and instead use descriptive labels like "submit" or "logo". Accessibility hints can provide additional information or instructions, such as "double-tap to open" or "swipe left to delete".

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Chintan Khetiya

Web & Mobile | Technical Architect | CSM? | Google Certified Project Manager | Product Management
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For Android, developers should integrate meaningful content descriptions through the "contentDescription" attribute, ensuring that each UI element is adequately described for users relying on screen readers like TalkBack. Additionally, providing informative hints using the "hint" attribute enhances the user experience, offering context for user interactions. On iOS, leveraging accessibility labels and hints is essential for VoiceOver users. Developers can set descriptive labels using the "accessibilityLabel" property and provide hints through the "accessibilityHint" property to convey additional information about the purpose or function of specific elements.

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3 Support dynamic text and font sizes

Dynamic text and font sizes are features that allow users to adjust the text size and style according to their preferences and needs. They are especially useful for users who have low vision or dyslexia, as they can improve the readability and legibility of the text. You should support dynamic text and font sizes in your app by using the system fonts and settings, and by avoiding fixed or absolute values for text attributes. You should also test your app with different text sizes and styles, and ensure that the layout and design are responsive and adaptable.

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Chintan Khetiya

Web & Mobile | Technical Architect | CSM? | Google Certified Project Manager | Product Management
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To enhance the accessibility and user experience of mobile apps on both platforms, supporting dynamic text and font sizes is crucial. For Android, developers can leverage the "sp" (scale-independent pixel) unit to ensure that text adjusts proportionally based on the user's device settings. Incorporating the "autoSizeTextType" attribute allows text to dynamically resize according to user preferences. On iOS, the Dynamic Type feature enables users to customize text sizes throughout the system, and developers can support this functionality by adopting the preferred content size category. You should also test your app with different text sizes and styles, and ensure that the layout and design are responsive and adaptable.

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4 Provide audio feedback and captions

Audio feedback and captions are audio cues and text transcripts that accompany the visual and tactile elements in your app. They can enhance the user experience and accessibility of your app by providing additional context and information. You should provide audio feedback and captions for all the sound effects, music, speech, and videos in your app, and make sure that they are synchronized and accurate. You should also allow users to control the volume and playback of the audio, and to turn on or off the captions.

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5 Avoid complex gestures and layouts

Complex gestures and layouts are user interactions and screen arrangements that require multiple or precise actions or movements. They can pose challenges and frustrations for users who use braille displays, as they might be difficult or impossible to perform or understand. You should avoid complex gestures and layouts in your app, and instead use simple and intuitive ones, such as single-tap, double-tap, swipe, or drag. You should also use a clear and consistent layout and navigation for your app, and avoid cluttering or overlapping the elements on the screen.

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6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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How can you design mobile apps that are compatible with braille displays?

1

2

3

4

5

6

1 Test your app with a braille display

2 Use accessibility labels and hints

3 Support dynamic text and font sizes

4 Provide audio feedback and captions

5 Avoid complex gestures and layouts

6 Here’s what else to consider

Mobile Applications

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How can you design mobile apps that are compatible with braille displays?

1

2

3

4

5

6

1 Test your app with a braille display

2 Use accessibility labels and hints

3 Support dynamic text and font sizes

4 Provide audio feedback and captions

5 Avoid complex gestures and layouts

6 Here’s what else to consider

Mobile Applications

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