ButterKit

ButterKit is a native macOS application for creating, localizing, and publishing App Store screenshots and metadata. It combines screenshot capture from Xcode Simulator, image import from linked folders such as Fastlane, and design tools in one app. Users can place screenshots into high-resolution 3D device frames, apply professionally designed templates, fonts, gradients, and backgrounds, and preview designs. The app also provides AI-powered translation for screenshots and metadata across all 50 App Store languages. ButterKit supports automation through AI/MCP integration and bulk export or upload to App Store Connect, aiming to reduce repetitive file juggling and manual localization. It is distributed as a macOS app, including via the Mac App Store, and offers templates, documentation, and a Motion beta feature.

Category: AI Agent
Pricing: Unknown

Problem solved

App Store screenshot production and localization is often manual and fragmented across design tools, translation services, Xcode exports, and upload workflows. ButterKit solves this by providing one macOS workflow for capturing, designing, translating, and publishing screenshots and metadata to App Store Connect, with optional AI/MCP automation.

Use cases

Capture App Store screenshots directly from Xcode Simulator
Import and manage screenshot folders generated by Fastlane or Xcode UI tests
Design screenshots with 3D device frames, templates, fonts, gradients, and backgrounds
Translate App Store screenshots and metadata into up to 50 App Store languages
Bulk-export localized screenshot sets for App Store submission
Automatically upload screenshots and metadata to App Store Connect
Automate screenshot creation, updates, and localization via AI agents using MCP
Create motion or marketing assets with ButterKit Motion beta

Audience

Developers
Designers
Product Managers
Startups
Enterprise

Pros

Native macOS app with Metal-powered editing and up to 120fps performance
Direct Xcode Simulator capture avoids export and import file juggling
AI-powered localization for all 50 App Store languages
AI/MCP automation allows agents to build, update, and localize screenshots
One-click bulk upload to App Store Connect

Cons

Available only on macOS; no Windows, Linux, or web version indicated
Requires Apple developer ecosystem and App Store Connect for publishing
Pricing is not specified in the provided homepage markdown
AI translations and generated metadata may need manual quality review
No public GitHub repository or open-source license is provided in the source

Official website: https://butterkit.app/

Canonical LambdaBase page: https://www.lambdabase.com/tools/butterkit

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ButterKit

Unknown

• Updated Sep 15, 2026, 03:17 PM

ButterKit is a native macOS application for creating, localizing, and publishing App Store screenshots and metadata.

Use Cases ▼

Capture App Store screenshots directly from Xcode Simulator

Import and manage screenshot folders generated by Fastlane or Xcode UI tests

Design screenshots with 3D device frames, templates, fonts, gradients, and backgrounds

Translate App Store screenshots and metadata into up to 50 App Store languages

Bulk-export localized screenshot sets for App Store submission

Automatically upload screenshots and metadata to App Store Connect

Automate screenshot creation, updates, and localization via AI agents using MCP

Create motion or marketing assets with ButterKit Motion beta

What Problem It Solves ▼

Key Features ▼

✓

Native macOS app with Metal-powered editing and up to 120fps performance

✓

Direct Xcode Simulator capture avoids export and import file juggling

✓

AI-powered localization for all 50 App Store languages

✓

AI/MCP automation allows agents to build, update, and localize screenshots

✓

One-click bulk upload to App Store Connect

Overview

Full Description ▼

Users can place screenshots into high-resolution 3D device frames, apply professionally designed templates, fonts, gradients, and backgrounds, and preview designs. The app also provides AI-powered translation for screenshots and metadata across all 50 App Store languages.

ButterKit supports automation through AI/MCP integration and bulk export or upload to App Store Connect, aiming to reduce repetitive file juggling and manual localization. It is distributed as a macOS app, including via the Mac App Store, and offers templates, documentation, and a Motion beta feature.