Mood Detector

What it does

Mood Detector maps measurable audio features — estimated tempo, overall energy, and bright vs dark spectral balance — onto simple labels such as energetic, calm, dark, or bright.

This is not emotion recognition and not a neural model. It is a transparent heuristic so you can sort demos or sketches quickly. Two tracks with similar statistics may feel different to a listener; treat the label as a coarse tag, not a final judgment.

Processing stays on your device.

How the label is chosen

Three measurements drive the result: estimated tempo (faster tracks skew toward "energetic"), overall RMS energy (louder, denser mixes skew away from "calm"), and spectral centroid — where the brightness of the sound sits, which separates "bright" from "dark" tone. Fixed thresholds turn those three numbers into one of a small set of labels, the same way every time, so results are consistent across a batch of files.

Good uses for a mood tag

Quickly sorting a folder of demos, tagging sample packs, or getting a rough first pass before manually curating a playlist are all reasonable uses. It is not a substitute for listening when the decision matters — genre, lyrics, and arrangement carry emotional information that a signal-level heuristic cannot see.

Check the numbers behind the label with the BPM Detector, or shape brightness yourself with the Audio Equalizer.

How to use it

Tip: If a track changes mood midway (a quiet intro building into a loud drop), run the detector on each section separately rather than expecting one label to describe the whole song.