No need to build separate mobile app.
With IBM Domino Mobile Apps, your entire organization can access every single one of its Domino applications from an iPad, and bring the power of Domino to end users wherever they are working — online or offline. IBM Domino Mobile Apps is free of charge and publicly available in the Apple App Store today. IBM Domino Mobile Apps works in the same way as your Notes client.
https://www.ibm.com/blogs/collaboration-solutions/2019/04/24/download-ibm-domino-mobile-apps-today/
Great App by IBM. No Mobile App development now.