Accessibility is no longer a "nice to have" that gets squeezed out of the sprint. In 2027 it is a legal, commercial and ethical expectation. More than a billion people live with some form of disability, and that doesn't count people with temporary or situational limits such as a broken arm or bright sunlight. If your app doesn't work for them, you're losing users and taking on risk. For any mobile app development company, and for every business investing in mobile application development, accessibility is now part of building a quality product.

The rules to know in 2027

United States: ADA Title II. The Department of Justice's rule requires state and local government web content and mobile apps to meet WCAG 2.1 Level AA. The DOJ pushed the deadlines back by a year with an interim final rule published on April 20, 2026. Entities serving 50,000 or more people now have until April 26, 2027, and smaller entities and special districts have until April 26, 2028. The substantive requirements of the 2024 rule were not changed. If your mobile app developers build apps for public agencies, universities or anyone working with them, this date matters to your clients.

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The rest of the US

Private businesses aren't covered by that specific technical rule. They still face lawsuits under ADA Title III, and courts commonly use WCAG as the yardstick. Commentators view the Title II framework as the likely blueprint if a future DOJ ever sets a technical standard for private-sector apps. Treat WCAG as the safe baseline either way.
 

European Union: European Accessibility Act (EAA). 

The EAA has applied since June 2025. It covers many consumer-facing digital products and services, including e-commerce, banking, e-books, and transport ticketing apps. It points to the EN 301 549 standard, which maps closely to WCAG. If you serve EU customers, this applies even if your company is based elsewhere.
 

Other regions. 

Canada, the UK, Australia and India all have accessibility laws or procurement requirements, and more are tightening. Building to a common standard is easier than tracking each country.

Which standard to target

Aim for WCAG 2.2 Level AA as your working target. It builds on 2.1, so you cover the ADA Title II requirement, and it adds criteria that matter on mobile, such as larger touch targets and better support for dragging gestures. Pair it with the platform guidance from Apple (Human Interface Guidelines) and Google (Material and Android accessibility docs). This applies to custom mobile app development as much as to off-the-shelf builds, and to Android app development (TalkBack, large touch targets, varied screen sizes) as much as iOS.

A practical checklist

Vision

  • Text contrast is at least 4.5:1 (3:1 for large text and key UI elements).
  • Text scales with the system font size setting without breaking the layout.
  • Information is never conveyed by color alone (add icons, labels or patterns).
  • Every meaningful image, icon and button has a clear text alternative.
  • Dark mode and high-contrast settings are respected.

Screen readers (VoiceOver and TalkBack)

  • Every interactive element is reachable and announced with a meaningful label, role and state.
  • Reading and focus order follows the visual order.
  • Headings are marked as headings, and custom components expose the right accessibility traits.
  • Dynamic changes, such as errors, toasts and loading states, are announced.

Touch and motor

  • Touch targets are at least 44×44 pt (iOS) or 48×48 dp (Android), with space between them.
  • Every gesture-based action (swipe, pinch, drag) has a simple alternative, such as a button.
  • No action depends on precise timing or complex multi-finger input.
  • The app works with switch controls, voice control and external keyboards.

Hearing

  • Videos have captions, and audio content has transcripts.
  • Alerts don't rely on sound alone, so add visual or haptic cues.

Cognitive and general usability

  • Navigation, labels and layouts are consistent across screens.
  • Forms have clear labels, helpful error messages and easy ways to correct mistakes.
  • Animations can be reduced or turned off, and nothing flashes more than three times per second.
  • Time limits can be extended, and users aren't pushed through confusing flows.
  • Orientation isn't locked unless it's essential.

Process

  • Accessibility is in your design system and your definition of done.
  • You test with real assistive technologies on real devices, not just automated scanners, which catch only part of the issues.
  • You include users with disabilities in testing when possible.
  • You publish an accessibility statement and provide a way to report problems.
  • You re-audit after major releases.

How to get started without a big rewrite

  1. Audit your top user journeys first. Sign-up, search, checkout and support cover most of the value.
  2. Fix the foundations in your design system. Colors, type scales, buttons and form fields fixed once improve every screen.
  3. Add automated checks to your pipeline. Linters and accessibility scanners catch regressions early.
  4. Test manually every release. Spend 30 minutes with VoiceOver or TalkBack before each launch.
  5. Assign ownership. Accessibility sticks when someone is accountable for it.

Building accessibility into your development process

Accessibility is cheapest when it is part of the brief from day one. When you hire mobile app developers or brief an app development agency, make these points part of the contract:
 

  • Name WCAG 2.2 Level AA as the acceptance standard in your requirements.
  • Ask for accessibility-aware UI/UX design, with a color palette, type scale and component library that meet contrast and size rules.
  • Include screen reader testing on real iOS and Android devices in the QA plan, not just automated scans.
  • Check that application development services cover audits, remediation and re-testing after major releases.
  • Make sure your android application development and iOS teams share one accessibility checklist so behavior is consistent across platforms.

The right mobile app development services partner will treat these as standard practice, not an add-on.

Final thoughts

Accessible apps are easier to use for everyone, rank better in app stores through better reviews, and reach a larger audience. The cheapest time to build accessibility in is at the design stage, and the most expensive time is after a legal notice.
 

If you want an accessibility audit or a build that meets WCAG from day one, DianApps, a trusted mobile app development company, can help. From custom mobile app development to Android and iOS delivery, our mobile app developers and application development services build accessibility in from the start. Explore our mobile app development services at dianapps.com/mobile-app-development or get in touch to talk through your project.