The cost to develop an app like WhatsApp for iOS can vary based on several factors, including features, complexity, design, and development hours. A rough estimate for a basic messaging app with essential features might range from $30,000 to $50,000. However, for a feature-rich app with advanced functionalities, the cost could go higher, potentially exceeding $100,000.

It's crucial to consider factors such as user authentication, real-time messaging, multimedia sharing, security features, and any unique elements you want to incorporate into your app.

For a more accurate estimate tailored to your specific requirements, it's advisable to consult with a reputable app development company like Appticz. They can provide insights based on your project goals, ensuring a comprehensive and customized solution. Know more about our app development services: https://appticz.com/mobile-app-development