We have and requirement to build property management app(android,iOS) for singapore, is there any SDK available for integrate , can anyone explain details about how to integrate in mobile app
Have you seen the docs? They provide some android/iOS demos.
What you actually need to display any map in a native app is the Mapbox SDK for your corresponding platform. Then use OneMap’s basemap and APIs as you require.
Although, in my opinion, you should build a web app instead, and deploy it as a mobile app using Cordova / Capacitor. This will give you a consistent look and feel throughout the different destros of your app, and you will not need to maintain 2 code bases.