App accessibility is not a final inspection. If teams wait until release, changes may require reworking screens, code, or product decisions. Instead, schedule checks at each stage, from early planning through post-launch updates. Each check answers a different question: Are user needs represented? Can people understand and operate the design? Does the working app support assistive technology? A repeatable process helps teams catch issues sooner and verify fixes before they reach users.
Start During Product Planning
Include accessibility in discovery, before the team settles on features or technical requirements. Identify the tasks the app must support and consider how people with different vision, hearing, mobility, and cognitive needs will complete them. Ask what information or actions could become inaccessible if a feature depends only on color, sound, precise gestures, or a timed response.
Turn those needs into acceptance criteria the team can check later. For example, specify that key flows must work with a screen reader, text must remain usable when enlarged, and users must be able to complete tasks without relying on a single input method. Review these criteria whenever the scope changes, rather than treating them as optional quality improvements.
Check Designs Before Coding
Review wireframes and prototypes for structure, clarity, and interaction. Check whether controls have clear labels, instructions explain what users need to do, and error messages identify how to recover. Make sure important meaning is not conveyed through color alone, and consider how longer text or enlarged text could affect the layout.
Test prototypes with keyboard navigation where applicable and with screen readers on the platforms the product will support. A prototype cannot reveal every technical issue, but it can expose confusing sequences, missing labels, and inaccessible interaction patterns before developers build them. Include people with disabilities in research when possible, and provide a way for them to use their preferred assistive technology.
Test During Development
As each feature becomes functional, combine automated checks with hands-on testing. Automated tools can flag some issues, such as certain contrast or markup problems, but they cannot judge whether instructions make sense or whether a screen reader announces a task clearly. Developers should also inspect focus order, control names, text scaling, and behavior across supported devices and operating-system settings.
Test complete user journeys, not just isolated screens. Move through sign-up, search, checkout, or other core tasks using the keyboard and a screen reader. Check that focus moves predictably, dialogs return focus appropriately, and validation messages are announced and connected to the relevant fields. Record each issue with steps to reproduce, expected behavior, and the affected platform so fixes can be verified.
Verify Before and After Release
Before release, run a planned accessibility pass on the finished build. Prioritize critical user journeys and confirm that issues reported during design and development have been resolved. Test on the devices, operating systems, and assistive technologies the app supports. If the release includes new components or a redesigned flow, check how those changes affect existing tasks as well as the new feature.
Accessibility testing continues after launch. Retest when the app changes, when a platform update affects behavior, and when users report barriers. Keep a clear channel for feedback and include accessibility checks in regression testing so a new update does not reintroduce old problems. Bristol Access Lab can help teams plan these checks, but the process should remain part of the product team's regular work.
Schedule accessibility checks at decisions that can change the user experience: defining requirements, reviewing designs, building features, and preparing releases. Pair automated tools with manual testing and user feedback, then retest after meaningful updates. This approach makes accessibility a routine part of product quality. If your team needs help shaping a practical testing process, contact Bristol Access Lab.