Build an iOS trading mockup in Paper with Claude Code

Felix Lee used Claude Code over MCP to create a Robinhood-like stock trading app layout inside Paper.

Done with Claude Codeยท Intermediateยท Nov 2026

What they did
Felix Lee set up Paper Desktop for Mac, which launches an MCP server whenever an open file is present, and linked it to Claude Code from the terminal. He started with an empty Paper document and sent a single instruction for a simple, attractive iOS stock trading interface inspired by Robinhood. Claude Code placed the first version into the workspace, then Felix asked for a stock detail view and a new color scheme.
How it went
He says the process produced a strong-looking app concept without any manual arranging, and that he has repeated the workflow more than 100 times. The follow-up guidance sits behind a paywall, and no measurement data was provided.
Tips
Paper Desktop needs to be running with a file already open or the MCP connection will not work. If the link breaks, relaunch Claude Code and use /mcp to check that Paper is available.

Try it yourself with Claude Code

Connect to my open Paper file through MCP and create a [type of app] for [platform] in the visual style of [reference app]. Add [number] main screens, including [screen 1], [screen 2], [screen 3], and [screen 4], and keep the layout, spacing, and colors consistent. After the draft is ready, stop and ask for approval before making anything irreversible, such as sending, deleting, submitting, or paying. Then give me a brief list of the design decisions you made.

Fill in the [brackets]. Agents can make mistakes, so review anything before it is sent, paid or deleted.

Read the original on adplist.substack.com โ†—

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