Blitz

Native macOS app for building, testing, and shipping iOS apps with AI agents

Blitz is a native macOS app that gives AI agents full control over the iOS development lifecycle — simulator/iPhone management, database setup, and App Store Connect submission. It includes built-in MCP servers so Claude Code (or any MCP client) can build, test, and submit your app to the App Store.

Demo: submitting an app to App Store Connect for review

https://github.com/user-attachments/assets/07364d9f-f6a7-4375-acc8-b7ab46dcc60e

Requirements

• macOS 14+ (Sonoma)
• Xcode 16+ (Swift 5.10+)
• Node.js 18+ (for build scripts and sidecar)

Build from source

# Clone
git clone https://github.com/blitzdotdev/blitz-macos.git
cd blitz-macos

# Debug build
swift build

# Release build
swift build -c release

# Bundle as .app (ad-hoc signed)
bash scripts/bundle.sh release

# The app is at .build/Blitz.app
open .build/Blitz.app

For signed builds, copy .env.example to .env and fill in your Apple Developer credentials, then run:

bash scripts/bundle.sh release

Verify a release binary

Every GitHub release includes SHA256SUMS.txt with checksums of the CI-built binary. To verify: claude-mono (1).md Option 1: Check a downloaded binary against release checksums

# Download both Blitz.app.zip and SHA256SUMS.txt from the GitHub release
shasum -a 256 -c SHA256SUMS.txt

Option 2: Build from source and compare

bash scripts/verify-build.sh v1.0.20

This builds the app locally and compares the main executable checksum against the release. CI builds use ad-hoc signing, so checksums match when you build with the same toolchain.

Option 3: Inspect the CI build yourself

All release binaries are built by the public GitHub Actions workflow. The workflow is transparent — you can audit every step and verify that the published artifact matches what the workflow produced.

Security and privacy

• No analytics or telemetry. The app makes zero tracking calls. No data is collected about your usage.
• No phone-home. The only network requests are to Apple's App Store Connect API (when you use ASC features) and GitHub's releases API for optional update checks.
• MCP server is localhost-only. The built-in MCP server binds to 127.0.0.1 and is never exposed to the network.
• No access to sensitive data. The app does not access your contacts, photos, location, or any personal data. Screen capture is limited to the iOS Simulator window.

Architecture

Single-target SwiftUI app built with Swift Package Manager. All source lives in src/. See CLAUDE.md for detailed architecture documentation.

License

Apache License 2.0