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StemMaster
Dubai, UAE
What it is
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 based on their measured roles, and can detect song sections to automate gain, pan, filters, reverb and stereo width. Vocal riding and spectral unmasking tools can help manage competing frequency ranges. Users can supply a commercial reference track to guide tonal balance, width and dynamics while keeping a selected loudness target. Listed targets include Streaming −14, Club −9 and broadcast EBU R 128 −23 LUFS. StemMaster loads WAV, AIFF, FLAC, MP3 and OGG stems, with 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 API key and sends measurement summaries, not audio, to the selected provider. The maker says processing runs locally and audio is never uploaded. The free demo is the full app, but exporting needs a license and unlicensed playback has a periodic audio tag. Subscriptions cost $9.99 a month or $59 a year; a lifetime license costs $99 once.
For and against
For
- Explains its processing decisions.
- Automates several mix controls by song section.
- Built-in analysis works offline.
- Analysis and audio processing run locally, according to the maker.
Against
- It is standalone, not a VST plugin.
- Intel Macs are unsupported.
- Demo exports require a license.
- Unlicensed playback includes a periodic audio tag.
The verdict
StemMaster offers stem-focused mixing and mastering with local processing and optional API-based AI analysis. Check the supported systems and demo export limits, and choose among the listed subscription or lifetime licenses if exporting is needed.
Who it suits
StemMaster suits producers working with exported stems who want automated mixing and mastering outside a DAW plugin. It is for users on supported Windows versions or Apple Silicon Macs; Intel Macs are unsupported.
Plans and prices
Monthly subscription
Up to 3 machines · Windows and macOS · License lasts through paid period
Read 3 Oct 2026 · nomzstudios.com
Annual subscription
Up to 3 machines · Windows and macOS · License lasts through paid period
Read 3 Oct 2026 · nomzstudios.com
Lifetime license
Up to 3 machines · Windows and macOS · Free 1.x updates
Read 3 Oct 2026 · nomzstudios.com
On the record
- 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 · read 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 · read 3 Oct 2026
- Automation
- It detects song sections and can automate gain, pan, filters, reverb and stereo width by section.nomzstudios.com · read 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 · read 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 · read 3 Oct 2026
- Loudness targets
- The listed targets are Streaming −14, Club −9 and broadcast EBU R 128 −23 LUFS.nomzstudios.com · read 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 · read 3 Oct 2026
- Purpose
- StemMaster analyzes audio stems, mixes and masters them, and explains its processing decisions.nomzstudios.com · read 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 · read 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 · read 3 Oct 2026
- Stem mixing
- It balances, pans, EQs and compresses stems according to their measured roles.nomzstudios.com · read 3 Oct 2026
- Support
- The maker says it answers questions publicly in its Gearspace thread.nomzstudios.com · read 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 · read 3 Oct 2026
- Vocal and frequency tools
- Features include a vocal rider and spectral unmasking that can duck competing frequency ranges.nomzstudios.com · read 3 Oct 2026
