Calculator for app development cost estimation with a strong emphasis on Accessibility (A11y) Focused Development for Public Service applications in the US, UK, and Australia. This calculator highlights the critical need for apps (e.g., government services, public transport, healthcare information) to be usable by people of all abilities, adhering to standards like WCAG (Web Content Accessibility Guidelines). Development teams with proven A11y expertise in the US (Section 508), UK (Equality Act), and Australia (Disability Discrimination Act) are essential. The cost implications of A11y are integrated throughout the development lifecycle: design (color contrast, focus indicators, clear navigation), development (semantic HTML, ARIA attributes, keyboard navigability, screen reader compatibility), and testing (manual and automated A11y checks, testing with assistive technologies). The calculator will factor in training for the development team on accessibility best practices, conducting accessibility audits, and remediation of any identified issues. Features common in public service apps like form submissions, information retrieval, and secure authentication must all be fully accessible. Ongoing costs include maintaining accessibility as the app is updated and ensuring new features also meet A11y standards. While it adds to the initial budget, building accessible apps broadens reach and is often a legal requirement.