app-screenshots_skill

Overview

This skill generates App Store and Play Store screenshots with realistic device frames using fastlane. It automates snapshot capture across simulators and emulators, applies device frames, and organizes outputs by platform, locale, and device. The workflow is CLI-first and CI-friendly, requiring only open-source tools and local SDKs.

How this skill works

You provide target app paths, platforms, devices, and locales. The skill configures a Snapfile, runs fastlane snapshot to capture screens on configured simulators/emulators, then runs fastlane frameit to apply device frames and output polished assets. Resulting screenshots are organized into platform/locale/device folders ready for store submission or localization pipelines.

When to use it

• Preparing screenshots for App Store or Google Play submissions
• Updating marketing assets after UI changes
• Localizing screenshots for multiple languages and regions
• Automating screenshot generation in CI/CD pipelines
• Creating device-framed promo images for store listings

Best practices

• Install fastlane via gem and ensure Xcode or Android SDK is configured on the build agent
• Set up a Snapfile with routes, devices, and locales before running snapshot
• Run snapshot on clean simulator/emulator instances to avoid flakiness
• Keep localization strings and test routes version-controlled for repeatability
• Validate final images against store size and metadata requirements before upload

Example use cases

• /app-screenshots apps/mobile for ios in english and spanish — capture iOS screenshots localized to two languages
• /app-screenshots . for iphone 15 pro only — generate screenshots for a single device during local QA
• CI job that generates screenshots for multiple device families and pushes assets to a release branch
• Bulk regenerate screenshots after a UI redesign and reapply device frames automatically