Skills

Free skill for Claude Code and Codex

Duo Designer

Most apps will arrive on iPhone Duo stretched. Yours will unfold.

Get it free

A hand holds iPhone Duo closed, its outer screen showing the home screen; the phone turns and opens into two hands, landscape, the home screen spread across both pages.

Book reader design on the open iPhone Duo: a botanical plate beside chapter fourCooking app design on the closed iPhone Duo: a sauce timer at 11:24Photo journal design on the open iPhone Duo: a harvest dinner beside September's photosMail app design on the closed iPhone Duo: an inbox with four messagesMusic app design on the open iPhone Duo: an album cover beside a cassette player
Running app design on the closed iPhone Duo: a 4:52 pace at kilometre 6Travel guide design on the open iPhone Duo: Santorini at sunset with the day's planWeather app design on the closed iPhone Duo: Lake Como at dusk, 17 degreesRecipe app design on the open iPhone Duo: pasta alla Norma beside its ingredientsTravel wallet design on the closed iPhone Duo: a boarding pass, Milan to Lisbon

Designs from the skill’s first step: GPT draws each app from your reference shots, native and made for both screens.

Both screens. And the fold between.

Two hands holding iPhone Duo open: a full-bleed photo of lemon risotto on the left page, the recipe and its ingredients on the right.
Designs your app for iPhone Duo.The outer screen for one hand, the inner spread for two, and what moves as it unfolds.
A hand holding iPhone Duo closed, its outer screen showing Supper, a cookbook, in cooking mode: step 3 of 6 and a timer.
Makes the app you have Duo-ready.Reads your SwiftUI, UIKit, Expo, React Native or Flutter code against Apple’s rules, and fixes what it finds.
iPhone Duo standing half open like a book: Procida's harbour full bleed on the left page, a three-day guide on the right.
Shoots it like Apple would.Every photo here was made by the skill, on a ChatGPT plan: the hands and titanium generated, the screens placed in.

Free. Ready for October 23.

  1. 1Leave your email, or sign in and it downloads now.
  2. 2Unzip it, open the folder in Claude Code or Codex, and type hi.
  3. 3Ask for my app, ready for iPhone Duo.

Free. It arrives by email, or sign in to download it now.

Needs Claude Code (a paid Claude plan) or Codex (a ChatGPT plan), and Node.js 18+. A Mac with Xcode 27.1 for the simulator. No tool can promise App Review approval: it tells you what it checked.