op1.fun app

Native macOS menu-bar companion app for op1.fun.

This is a Swift/AppKit/SwiftUI rewrite of the old Electron app. It is fully native and has a tiny runtime footprint compared with the older Electron build. It keeps the same core behavior:

• Finds a mounted OP-1 in disk mode.
• Scans synth and drum patch folders, excluding OP-1 user preset folders.
• Reads OP-1 AIFF/AIFC APPL metadata to categorize synth, drum, and sampler patches.
• Logs into api.op1.fun and enables the app feature flag.
• Registers the op1fun:// URL scheme.
• Handles website "Save to OP-1" links for patches and packs.
• Downloads patch files into the mounted OP-1 under synth, drum, or pack subfolders.

Development

Open op1fun.xcodeproj in Xcode, select the op1fun scheme, and run.

The project uses ad-hoc signing by default so it can build locally without a configured Apple team. For publishing, set your Team and signing identity in Xcode, then use Product > Archive.

Sandboxing

The app includes App Sandbox entitlements for outbound network access, user-selected read/write access, and app-scoped security bookmarks. The user-selected disk permission is required for writing to an OP-1 mounted as an external volume.