ButterKit

ButterKit is a macOS‑only tool that lets developers create and polish App Store screenshots. It can capture images directly from the Xcode Simulator or import a folder of PNG/JPG files, such as those generated by Fastlane, and then place them onto photorealistic 3D device frames rendered with Metal. The app provides a library of professionally designed templates, as well as full controls for fonts, gradients, backgrounds, and multi‑artboard panoramas, allowing users to compose marketing‑ready visuals quickly.

In addition to visual design, ButterKit offers instant translation of screenshots and app metadata into all 50 App Store languages, and a one‑click upload to App Store Connect. The translation and publishing workflow stays synchronized across language versions. The software is positioned for iOS and macOS developers who need a streamlined, integrated solution for producing localized App Store assets.