Hacki
About the project
KNA is a lightweight browser-based audio analysis app that helps you explore the feeling and energy of a track by turning audio into a visual color heatmap. Upload a song, voice note, or recording, and the app analyzes the sound in short chunks to surface a vibe profile based on loudness and tonal brightness.
This project is designed for public-facing demo use: you can drop in audio, preview it in-browser, and view a stylized analysis of the sound without any backend processing.
What it does
- Upload audio files directly from your browser
- Supports common formats like MP3, WAV, M4A, FLAC, and OGG
- Shows waveform preview and file metadata
- Analyzes audio in 1-second chunks
- Maps each chunk to a color based on audio characteristics
- Displays a heatmap timeline and summary analytics
- Runs as a small Express app serving a modern frontend UI