I will develop a application in unity

Basic App: 

This service is perfect for clients who want a straightforward app with just a few screens, without any complex features. These apps will work seamlessly on both iOS and Android devices, and can be made available on PC upon request.

Standard App: 

This service is designed for clients who need an app with more advanced features, such as user authentication or payment integration. These apps may have several screens and require thorough testing to ensure their functionality, but they will still be user-friendly and work on both iOS and Android platforms.

Premium App: 

This service is for clients who require a high-quality app with cutting-edge features, such as artificial intelligence or virtual reality integration. These apps will be developed to the highest standards of quality and performance, and will be available on both iOS and Android platforms.

NOTE :- Unity not ideal for app development but allows deployment for both Android and IOS while costing you less money - Programming Language C#