Calculator for app development cost estimation using React Native developers in Australia, Singapore, and the US for Healthcare applications. This calculator emphasizes the critical compliance requirements, such as HIPAA (in the US), the Australian Privacy Principles (AU), and PDPA (SG), which govern sensitive health information. React Native allows for cross-platform development, potentially reducing costs compared to building separate native apps for iOS and Android, but the complexity lies in ensuring data security and privacy across platforms. Developer rates in Sydney (AU), Singapore (SG), and major US tech cities will influence the overall budget. Key features impacting cost include secure patient portals, electronic health record (EHR) integration, telemedicine functionalities (video conferencing, secure messaging), appointment scheduling, prescription management, and integration with wearable devices for health monitoring. The calculator will consider the rigorous testing and validation processes required for healthcare apps, including potential FDA or TGA (AU) approval pathways for certain medical device functionalities. Backend development must ensure robust encryption, access controls, and audit trails. Ongoing maintenance, security updates to patch vulnerabilities, and ensuring continued compliance with evolving healthcare regulations are significant long-term cost factors. The calculator will also touch upon the importance of user-friendly design for both patients and healthcare providers, accessibility features, and potential integrations with existing hospital or clinic information systems. Choosing experienced React Native developers familiar with healthcare compliance is crucial and will be reflected in the cost.