Goldie

Goldie is an app-store screenshot and preview-video generator for iOS apps, designed for coding agents and human users. It uses Argent flows to replay app interactions in an iOS simulator, captures the results, adds device bezels, backgrounds, headlines and other design elements, joins the clips into preview videos, and checks the output against Apple's upload rules. It is framework agnostic and can drive SwiftUI, UIKit, Flutter, React Native and Kotlin Multiplatform apps through the simulator.

The CLI provides commands to check tools, simulators and flows, run the capture-and-render pipeline, and open a browser-based studio for editing backgrounds, templates, bezels, fonts and per-tile copy. Design settings are saved in goldie.design.json, while generated assets are written to an output directory per locale. Goldie requires macOS with iOS simulators, Node.js 20 or newer and ffmpeg; its previews must be 15 to 30 seconds long. The project is sponsored by Software Mansion, the creator of Argent.