Stephen Gates of Citigroup At Citigroup’s Citibank, about 30 of 80 designers are using iPad Pros and the company plans to order more, said Mr. Gates, the head of design for Citi’s Global Consumer Bank in New York. He said he bought an iPad Pro on the day it was released because he had been waiting for a device that supported a capable stylus like the Apple Pencil.

Mr. Gates said Citi designers had used the iPad Pro to work on a new design for a Citi mobile app. Designers used the big iPads to sketch out and present mock-ups of the app and discuss where they wanted images or buttons, for example.

The iPad Pro’s big screen and stylus also came in handy in meetings for communicating with clients. A designer can easily use the Apple Pencil to illustrate ideas on the screen for the client and vice versa, he said.

Mr. Gates says the Apple Pencil also lets him digitize his whole creative process, from sketching to production — though a big part of his workflow still involves a computer. Before he bought an iPad Pro, he had tried 20 styluses for sketching illustrations or jotting down ideas, he added.

Nonetheless, the iPad Pro primarily helps Citi designers conceive ideas, not create final products, he said. When it comes to production, Mr. Gates said, he moves his initial ideas to a computer to use desktop apps like Adobe Photoshop to refine and polish the designs.

He said he thought the iPad Pro could eventually replace his computer, but not yet because of the limitations of the current apps. Many creative apps designed for the iPad Pro focus on the start of the design process, like sketches and rough compositions, while desktop apps have the ability to do more complex image manipulations, animations and other functions.