Although development for mobiles with different screens and hardware features is quite standardized nowadays, your designs and functionality will need to be adapted for different resolutions and aspect ratios. Testing the final application in different devices will be necessary to ensure the quality of your solution.

Whilst in iOS you will need to test your application on devices from Apple, with Android you will need to test on devices from different manufacturers. Each manufacturer creates products based on different market standards that match their target customers, and can modify the operating system to adapt it to their specific needs.

Nor can we forget that our end users will have different versions of these operating systems, which can affect elements of the user interface. When using native system elements, the user experience can be better integrated with previous knowledge of our users, but it must also be taken into account that it will add an element of variability that should be checked.