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StemMaster
nomzstudios.com
What it is
StemMaster is a standalone app that analyzes audio stems, mixes and masters them, and explains its processing decisions. It balances, pans, equalizes, and compresses stems according to measured roles, and can detect song sections to automate gain, pan, filters, reverb, and stereo width. Tools include vocal riding and spectral unmasking. Users can supply a commercial reference track to guide tonal balance, width, and dynamics while retaining a selected loudness target. Listed targets are 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 engine works offline. An optional AI engine uses the user's own API key and sends measurement summaries, not audio, to the chosen provider. The free demo is the full app, but exporting requires a license and unlicensed mastered playback has a periodic audio tag. 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. Plans include $9.99 a month, $59 a year, or a 99.00 USD one-time lifetime license.
Spec sheet
- Purpose
- StemMaster analyzes audio stems, mixes and masters them, and explains its processing decisions.Read 3 Oct 2026 · nomzstudios.com
- 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.Read 3 Oct 2026 · nomzstudios.com
- Support
- The maker says it answers questions publicly in its Gearspace thread.Read 3 Oct 2026 · nomzstudios.com
- Headquarters
- Dubai, UAERead 28 Sep 2026 · nomzstudios.com
- 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.Read 3 Oct 2026 · nomzstudios.com
- 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.Read 3 Oct 2026 · nomzstudios.com
- Automation
- It detects song sections and can automate gain, pan, filters, reverb and stereo width by section.Read 3 Oct 2026 · nomzstudios.com
- 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.Read 3 Oct 2026 · nomzstudios.com
- Free demo
- The free demo is the full app, but exporting requires a license and mastered playback includes a periodic audio tag until licensed.Read 3 Oct 2026 · nomzstudios.com
- Loudness targets
- The listed targets are Streaming −14, Club −9 and broadcast EBU R 128 −23 LUFS.Read 3 Oct 2026 · nomzstudios.com
- Reference matching
- Users can provide a commercial reference track to guide tonal balance, width and dynamics while retaining the selected loudness target.Read 3 Oct 2026 · nomzstudios.com
- 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.Read 3 Oct 2026 · nomzstudios.com
- Stem mixing
- It balances, pans, EQs and compresses stems according to their measured roles.Read 3 Oct 2026 · nomzstudios.com
- 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.Read 3 Oct 2026 · nomzstudios.com
- Vocal and frequency tools
- Features include a vocal rider and spectral unmasking that can duck competing frequency ranges.Read 3 Oct 2026 · nomzstudios.com
Plans and prices
Monthly subscription $9.99 a month monthly; cancel any time Up to 3 machines · Windows and macOS · License lasts through paid period Read 3 Oct 2026 · nomzstudios.com
Annual subscription $59 a year once a year Up to 3 machines · Windows and macOS · License lasts through paid period Read 3 Oct 2026 · nomzstudios.com
Lifetime license $99, paid once one-time Up to 3 machines · Windows and macOS · Free 1.x updates Read 3 Oct 2026 · nomzstudios.com
Strong points and limits
Strong points
- Automates processing by detected song section.
- Offers reference-track guidance for tonal balance and dynamics.
- Built-in analysis works offline.
- Maker says audio processing runs locally.
- Lifetime license includes free 1.x updates.
Limits
- Not available as a DAW plugin.
- Intel Macs are unsupported.
- Exporting from the demo requires a license.
- Unlicensed playback includes a periodic audio tag.
Who it suits
It suits musicians or audio makers working with exported stems who want mixing and mastering controls in a standalone app. It is not a VST plugin, and Intel Mac users cannot run it.
Verdict
StemMaster pairs stem processing with reference matching and section-based automation, while keeping its built-in analysis offline. Check the platform requirements and demo export restriction, then compare subscription and one-time license terms.
Where Specifiction places it
- AI Audio Mixing Software#24 of 417.3
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