We strongly encourage you to include an accessibility checklist 
as a key criteria before shipping your app. Flutter is committed to
supporting developers in making their apps more accessible, and includes
first-class framework support for accessibility in addition to that
provided by the underlying operating system, including:

Large fonts

Render text widgets with user-specified font sizes

Screen readers

Communicate spoken feedback about UI contents

Sufficient contrast

Render widgets with colors that have sufficient contrast

Details of these features are discussed below.

Inspecting accessibility support

In addition to testing for these specific topics,
we recommend using automated accessibility scanners:

For Android:
    
      Install the Accessibility Scanner for Android
      Enable the Accessibility Scanner from
Android Settings > Accessibility >
Accessibility Scanner > On

      Navigate to the Accessibility Scanner ‘checkbox’
icon button to initiate a scan