FFT size
2048
Web Audio AnalyserNode, smoothing 0.7
RIP/DJ
See what your tracks actually sound like.
Spectrogram-first audio inspector for DJs. Drop in any track and RIP DJ reveals its full frequency content — live during playback and as a full-track view after the scan. Runs entirely on your phone.
TRACK_07 — MASTER.wav
44.1 kHz · 16-bit · 4:23
FULL-TRACK VIEW
What it shows you
01 / LIVE
Live spectrogram
Scrolling frequency heatmap during playback. 60 FPS, GPU-rendered via Skia, log-frequency axis.
02 / FULL-TRACK
Full-track view
The whole song's spectrum at a glance, rendered after a one-time offline FFT scan. Codec cutoffs and dark masters become obvious.
03 / WAVEFORM
Waveform scrubber
Seekable bar under the spectrogram. RMS + peak blend, gamma-compressed so quiet sections stay readable on loud-mastered tracks.
Supported
MP3 · FLAC · WAV · AAC · M4A · OGG · Opus · AIFF · CAF
decoded locally on-device
Rendering
60 FPS
Skia GPU, dedicated thread
Network
Zero
no analytics, no telemetry
Private by design.
Most audio tooling apps phone home. RIP DJ doesn't — the FFT runs on your phone, and audio files never leave the device. There is no server to turn off, because there is no server.
- 100% on-device FFT
- Zero network requests
- No accounts, no sign-in
- No analytics, no telemetry
- No uploads, ever
- No library or history stored