StemMaster

C tier on AI Audio Mixing SoftwareScore 6.5 · #3 of 34

Android app: Not listed
Free plan: No
Paid plans from: $4.92/mo
Runs on: Mac, Windows

nomzstudios.com

Summary

StemMaster is a standalone app that analyzes audio stems, mixes them, and masters the result while explaining its processing decisions. It balances, pans, equalizes, and compresses stems according to their measured roles, and can detect song sections to automate gain, pan, filters, reverb, and stereo width. Vocal riding and spectral unmasking are included. You can provide a commercial reference track to guide tonal balance, width, and dynamics while keeping the selected loudness target. Listed targets include Streaming −14, Club −9, and broadcast EBU R 128 −23 LUFS. The app loads WAV, AIFF, FLAC, MP3, and OGG stems, and supports exports including 24-bit audio and 32-bit float WAV. Its built-in analysis works offline; an optional AI engine uses your own API key and sends measurement summaries rather than audio to the selected provider. StemMaster runs on supported Windows systems and Apple Silicon Macs, but not Intel Macs. The free demo requires a license to export.

Who it is for

StemMaster may suit producers who want a standalone tool for stem mixing and mastering, with section-based automation and reference-track guidance. It is for supported Windows systems and Apple Silicon Macs, not Intel Macs.

What is good

Built-in analysis works offline.
Supports reference-track guidance for tonal balance, width, and dynamics.
Automates processing by detected song section.
Accepts WAV, AIFF, FLAC, MP3, and OGG stems.
Maker says audio is not uploaded.

What to know first

It is not a DAW plugin.
Intel Macs are unsupported.
Free demo requires a license to export.
Unlicensed playback includes a periodic audio tag.

Verdict

StemMaster offers standalone stem mixing and mastering with automation and reference-track guidance. Check the system requirements and licensing terms: exporting requires a license, and the free demo tags playback periodically.

StemMaster plans and pricing

All plans

Monthly subscription $9.99/mo monthly; cancel any time Up to 3 machines · Windows and macOS · License lasts through paid period nomzstudios.com · 3 Oct 2026

Annual subscription $59/yr once a year Up to 3 machines · Windows and macOS · License lasts through paid period nomzstudios.com · 3 Oct 2026

Lifetime license $99 once one-time Up to 3 machines · Windows and macOS · Free 1.x updates nomzstudios.com · 3 Oct 2026

Compared on AI audio mixing software

Free plan: Nonomzstudios.com
DAW plugin: Nonomzstudios.com
Stem separation: Nonomzstudios.com
Automatic EQ: Yesnomzstudios.com
Automatic dynamics: Yesnomzstudios.com
Spatial processing: stereonomzstudios.com
Plugin formats: standalonenomzstudios.com

Facts

Purpose: StemMaster analyzes audio stems, mixes and masters them, and explains its processing decisions.nomzstudios.com · 3 Oct 2026
Stem mixing: It balances, pans, EQs and compresses stems according to their measured roles.nomzstudios.com · 3 Oct 2026
Automation: It detects song sections and can automate gain, pan, filters, reverb and stereo width by section.nomzstudios.com · 3 Oct 2026
Vocal and frequency tools: Features include a vocal rider and spectral unmasking that can duck competing frequency ranges.nomzstudios.com · 3 Oct 2026
Reference matching: Users can provide a commercial reference track to guide tonal balance, width and dynamics while retaining the selected loudness target.nomzstudios.com · 3 Oct 2026
Loudness targets: The listed targets are Streaming −14, Club −9 and broadcast EBU R 128 −23 LUFS.nomzstudios.com · 3 Oct 2026
Audio formats: It loads WAV, AIFF, FLAC, MP3 and OGG stems, and supports multiple export formats including 24-bit audio and 32-bit float WAV.nomzstudios.com · 3 Oct 2026
AI engines: The built-in analysis engine works offline; the optional AI engine uses the user's own API key, with Anthropic, OpenAI, z.ai and compatible providers listed.nomzstudios.com · 3 Oct 2026
DAW workflow: StemMaster is a standalone app rather than a VST plugin, and the FAQ describes exporting stems from DAWs such as Ableton, FL Studio, Logic, Reaper and Cubase.nomzstudios.com · 3 Oct 2026
Privacy: The maker says analysis, mixing and mastering run locally and audio is never uploaded; the optional AI engine sends measurement summaries, not audio, to the selected provider.nomzstudios.com · 3 Oct 2026
Security and telemetry: The privacy policy says the app has no account, usage tracking, crash reporting or analytics SDK, and stores API keys in the operating system credential store.nomzstudios.com · 3 Oct 2026
Free demo: The free demo is the full app, but exporting requires a license and mastered playback includes a periodic audio tag until licensed.nomzstudios.com · 3 Oct 2026
System requirements: It runs on 64-bit Windows 10 version 2004 or newer and Windows 11, or Apple Silicon Macs on macOS 15 or newer; Intel Macs are unsupported.nomzstudios.com · 3 Oct 2026
Support: The maker says it answers questions publicly in its Gearspace thread.nomzstudios.com · 3 Oct 2026