The best alternatives to OuiShopp are Capitan, Shopping Party, and Showping. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hurree— The smarter, simpler way to analyze your data
Showping is the power of word of mouth in your pocket. Showping is a unique app where you can share your Wish and Bought list with friends. It's a place where people can read reviews from someone they trust and do shopping together through screen sharing.
Get Sum is a beautiful shopping list app built with iOS design guidelines in mind. It is quietly powerful without being complicated or daunting to use. It’s as simple as carrying around a physical shopping list, but it can do so much more.