Definition
Fidelity refers to how closely the prototype resembles the final product i.e. does it actually work. While resolution refers to the level of detail in the prototype i.e. are the text and colours correct.
High versus Low
Higher fidelity prototypes may require more time and resources to create but can provide a more realistic representation of the final product. Lower fidelity prototypes, on the other hand, can be created quickly and inexpensively, but may not accurately represent the final product.
Similarly, higher resolution prototypes may require more time and resources to create but can provide a more detailed and precise representation of the final product. Lower resolution prototypes, on the other hand, can be created more quickly and with less resources, but may not have the level of detail required to accurately test certain aspects of the product.
Image: Low fidelity / low resolution prototype of mobile app.
Prioritise the Goal
The decision to prioritize fidelity or resolution in prototyping will depend on the specific goals and needs of the project. For example, if the goal of the prototype is to test user interactions and usability, a higher fidelity prototype may be more appropriate. If the goal is to test technical feasibility, a higher resolution prototype may be necessary.
It is important to keep in mind that prototyping is an iterative process, and it may be necessary to create multiple prototypes with varying levels of fidelity and resolution in order to fully test and refine the product.