DirMerge is a boutique macOS utility focused on one job: merging and syncing folders without risking accidental data loss. It targets users who keep multiple copies of the same archive across internal disks, external drives, and backups, and who want to consolidate them safely rather than trust a generic file manager.
The core feature is APFS zero-space cloning via Darwin copyfile copy-on-write, which lets gigabytes of data be merged instantly while consuming no additional storage. Target-newer protection prevents older files from overwriting newer ones, and a one-click undo provides a safety net. The app is 100% offline and sandboxed, with no network permissions, and ships as a featherweight native SwiftUI build.
It is built for photographers, creators, and data hoarders who work primarily on macOS 13 or later, including Apple Silicon and Intel Macs. Users who need cloud sync, cross-platform support, or automated scheduling will find it intentionally limited.
A practical approach is to start with a small test folder to confirm merge behavior, then use the undo feature freely during larger consolidations. Because it is offline and local-only, it fits privacy-sensitive workflows well. Overall, DirMerge is a focused, low-risk tool for a common but nerve-wracking task.
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