Prototyping on a budget

Swappa makes it easy for developers to purchase older hardware for testing. This works best for ongoing testing week after week.

For rapid prototyping, another approach might work: purchase and return. I just returned an iPad pro after spending the past week prototyping a feature that I thought might improve the user experience of study groups. After testing prototypes with real users, I decided that other avenues were a better use of my time and money.