What is a good mix auditor score?

80 or above means few checks were flagged. A lower score points you to the checks worth listening for. A track can score well and still need mix changes.

Why does loudness not affect the score?

Loudness is a choice that depends on the song and the destination. The auditor reports it and compares it with the presets, but it does not reward or punish a level.

What should I do about a mono compatibility warning?

Listen to the track in mono. If the vocal or bass drops in level, narrow wide effects or check for phase problems between stereo parts.

No. All measurements are taken in your browser.

MixMasterAI

Audio analysis

Mix Auditor

Check the technical details. Make the final decision by ear.

What this checks

Gated integrated loudness, estimated true peak, full-scale samples, DC offset, peak-to-loudness ratio and stereo correlation. The score summarizes these technical checks; it is not a prediction of musical quality or streaming approval.

Peak estimates do not guarantee codec safety. Full-scale samples do not prove audible clipping, and a dynamics ratio cannot diagnose the processing history of a mix.

Destination comparisons use MixMasterAI’s reference presets. They are not a simulation of every platform’s playback behavior. Listen to mono playback, compare levels and check the final encoded file before release.

How the mix auditor works

How it works

Drop in an MP3, WAV, M4A, AAC, FLAC or OGG file up to 200 MB. The file is decoded and measured in your browser in a single pass. Nothing is uploaded.

What it checks

Estimated true peak: fails above 0 dBTP and warns above -1 dBTP.
Full-scale samples: the share of samples that reach digital full scale.
Integrated loudness: gated LUFS, flagged above -8 or below -18 LUFS for a closer listen.
Dynamics (PLR): the peak-to-loudness ratio, flagged below 6 dB or above 18 dB.
Mono compatibility: stereo correlation and how much level is lost when the track is summed to mono.
DC offset: a constant shift away from zero that wastes headroom.

What you get

Each check is marked pass, warn or fail, with its value and a short note. A score from 0 to 100 combines the peak, full-scale, dynamics, mono and DC checks, weighted by how much each one matters. Loudness is shown but does not change the score. You also see how far your loudness is from our presets for Spotify (-14 LUFS), Apple Music (-16), YouTube (-14), TikTok (-14) and SoundCloud (-11). Within 1.5 LU counts as near the preset.

Good to know

The score summarizes technical checks. It does not rate how the mix sounds, and it is not release approval.
Full-scale samples do not always mean audible clipping, and a peak estimate does not guarantee an encoded file will stay under 0 dB.
The presets are reference targets, not a simulation of each service's playback.

Questions

What is a good mix auditor score?: 80 or above means few checks were flagged. A lower score points you to the checks worth listening for. A track can score well and still need mix changes.
Why does loudness not affect the score?: Loudness is a choice that depends on the song and the destination. The auditor reports it and compares it with the presets, but it does not reward or punish a level.
What should I do about a mono compatibility warning?: Listen to the track in mono. If the vocal or bass drops in level, narrow wide effects or check for phase problems between stereo parts.
Is my mix uploaded?: No. All measurements are taken in your browser.