I covered accessibility from a broader product design perspective earlier, but mobile app design deserves its own focused discussion because the constraints and opportunities are unique. Mobile screens are smaller, interactions are touch-based rather than mouse-based, and users interact in environments that desktop applications never encounter: bright sunlight, noisy commutes, one-handed while walking, quick glances between other activities. Accessible design for mobile is not about accommodating edge cases. It is about designing for the full reality of how people actually use phones.
The principles that make apps accessible for users with disabilities are the same principles that make apps better for everyone using their phone in challenging conditions. A user with low vision and a user trying to read their screen in direct sunlight face the same design challenge. A user with motor impairments and a user wearing winter gloves need the same solution: larger, more forgiving touch targets.
Text Size and Readability
Respect the user’s system text size preference. Both iOS and Android allow users to set their preferred text size at the system level, and your app should respond to these settings by adjusting its text sizes accordingly. Apps that ignore this preference force users to choose between a comfortable system-wide text size and being able to read your specific app.
Set minimum text sizes that ensure readability even at the default system setting. Body text below fourteen points on iOS or fourteen scaled pixels on Android is difficult to read on phone screens regardless of the user’s vision. Labels, captions, and secondary text can be slightly smaller but should never drop below twelve points.
Avoid long blocks of text without breaks. Mobile reading is inherently more fatiguing than desktop reading because of the smaller screen, the variable lighting conditions, and the shorter attention spans that mobile context creates. Short paragraphs, clear headings, and generous line spacing improve readability for every user.
Touch Targets and Interactive Elements
The minimum touch target size recommended by platform guidelines, forty-four points on iOS and forty-eight dp on Android, is a minimum, not a target. For primary actions and frequently used elements, larger touch targets reduce errors and improve the feeling of responsiveness. Spacing between adjacent touch targets should be sufficient that tapping one does not accidentally activate its neighbor.
Swipe gestures should always have a visible alternative. Not every user can perform precise swipe gestures reliably, and swipe actions are invisible, meaning users who do not already know they exist have no way to discover them. Provide buttons or menu options that accomplish the same actions as swipe gestures so that functionality is accessible regardless of motor capability.
Screen Reader Compatibility
Test every screen with VoiceOver and TalkBack. Ensure every interactive element has a descriptive label that makes sense when read aloud without visual context. Images that convey information need descriptive alt text. Decorative images should be hidden from screen readers so they do not add noise to the auditory experience.
Navigation order should follow a logical sequence that makes sense when experienced linearly. Screen reader users cannot scan a page visually. They experience elements in the order the screen reader presents them, and if that order does not match the logical flow of the content, the experience becomes confusing and frustrating.
A mobile design team committed to accessibility builds these practices into their standard workflow rather than treating them as a final compliance check. The result is apps that work better for everyone. For more on inclusive app design, visit our blog.
