"We had to power down or leave instantly, " Ms. Moots wrote in her blog.

WSJ: No More Perks: Coffee Shops Pull the Plug on Laptop Users

For instance, FitWerx carries Serotta and IF, and also smaller Moots and Parlee, all custom.

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"Good luck staying open when you're turning half your clientele out on a Friday night, " Hannah Moots, 23, wrote about Cocoa Bar on Yelp, a Web site where customers rate retailers.

WSJ: No More Perks: Coffee Shops Pull the Plug on Laptop Users

When Ms. Moots, who aspires to be an archaeologist, met her boyfriend at the coffee shop after 8 p.m. on a Friday to work on graduate-school applications, she was ushered out, she says, even though the place was almost empty.

WSJ: No More Perks: Coffee Shops Pull the Plug on Laptop Users