Nomz Studios has brought StemMaster to macOS, extending the stem-based mixing and mastering application beyond Windows to Apple Silicon. The Mac build shipped on August 30 at version 1.1.46. Rather than mastering from a stereo bounce, StemMaster works directly from a multitrack’s individual stems. One license key covers both platforms and activates up to three machines in any combination, so existing owners already have Mac access. The Mac build requires macOS 15 or later on Apple Silicon (M1 or newer); Intel Macs and older macOS releases are not supported. It is signed with a Developer ID and notarized by Apple.
Two updates preceded the port. Version 1.1.45 added 24-bit AIFF as a master export option, alongside 24-bit WAV, FLAC, MP3, and dithered 16-bit WAV, added for Mac-side software and habits that expect that wrapper. Version 1.1.44 added a Stop button beside the render progress bar, so a master started with the wrong target no longer has to finish rendering before it can be cancelled.
The default engine mixes and masters entirely offline, with no account, connection, or upload involved. An optional second engine takes a user-supplied API key and works from measurements rather than raw audio; one supported provider runs its model locally, so the measurements never leave the machine either. Both engines log their decisions in plain English: what was done, to which stem, and which measurement justified it.
Nomz Studios has also published a free null-test pack (a mix, its stems, and the finished master in 24-bit FLAC) so users can verify the process themselves. Importing the stems at unity and inverting against the original mix drops the residual to -142 dB, according to the company.
Features
- Mixes and masters from individual multitrack stems rather than a stereo bounce.
- Runs on Windows 10/11 and macOS 15+ on Apple Silicon (M1 or later).
- Single license key activates up to three machines in any platform combination.
- Developer ID signed and notarized on macOS.
- Master export formats: 24-bit AIFF, 24-bit WAV, FLAC, MP3, dithered 16-bit WAV.
- Stop button for canceling an in-progress render (added in 1.1.44).
- Default engine runs offline with no account or internet connection required.
- Optional secondary engine uses a user-supplied API key and analyzes measurements, not audio.
- Full Mix stem export for null-testing the master against the original pre-master mix.
- Plain-English log of each mastering decision and the measurement behind it.
Pricing and Availability
Available now for $99 as a one-time purchase, with free updates across the 1.x series and activation on up to three machines. Standalone application (not a plugin) for Windows 10/11 and macOS 15+ on Apple Silicon. A free demo is available with exports disabled and a periodic tag on mastered playback.
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