ButterKit

ButterKit is a macOS-native tool that captures, designs, translates, and publishes App Store screenshots and metadata from a single workspace. It integrates with Xcode Simulator to capture screenshots and frames them in photorealistic 3D device devices. The product emphasizes offline operation, local rendering, and a one-time purchase option with optional subscription features. It targets developers, studios, and designers who manage App Store pages.

ButterKit provides a workflow to capture screenshots directly from the Xcode environment or via linked folders, and then apply localization across languages within the same artboard. It uses a 3D rendering engine built on Metal for high performance, and offers templates and a design toolkit to refine visuals. The tool keeps designs synced across languages and supports AI automation for design and localization tasks.

ButterKit offers templates, 3D device frames, and editing controls to adjust fonts, gradients, and backgrounds. It supports translating metadata and app text to 50 App Store languages, and can upload to App Store Connect or export images. It maintains a local, offline-first architecture with optional cloud features for translation and publishing, and features the MCP framework for AI agent automation.

ButterKit state supports macOS 26+ with Apple Silicon focus, a one-time purchase option plus subscription plans, and offline operation with optional online features including translations and App Store Connect uploads. It emphasizes independence from servers, a privacy-forward approach, and a focus on being owned by the developer without ads or accounts.

Use cases

• Automate localization workflows and design tweaks for app pages