How to use it
- 1
Upload Any Audio Track
Drag and drop your audio file (WAV, MP3, FLAC, M4A, OGG). The file is decoded locally in browser memory.
- 2
Real-Time Beat Grid Analysis
Web Audio DSP computes onset envelopes, autocorrelation, and phase alignment to lock onto the pulse.
- 3
Read BPM, Intervals & Beat Grid
View large BPM typography, interval in milliseconds, first-beat downbeat position, and visual timeline grid.
WHAT IT DOES
Everything this tool gives you
Interactive Beat Grid & Waveform Timeline
Visualize the exact rhythmic pulse of your song. Our DSP engine projects a continuous beat grid over your audio waveform, marking prominent downbeats and sub-beats so you can inspect rhythmic alignment at a glance.
- Dynamic waveform timeline with taller downbeat markers for seamless DJ beatmatching
- Real-time metronome flashing pulse synchronized with the detected tempo and phase
Downbeat Phase Alignment & First Beat Detection
Never guess where the one lands. Using phase energy optimization, the analyzer slides candidate grids across beat windows to lock the first downbeat directly on the onset transient rather than between beats.
- Precision first-beat detection in seconds for clean loop slicing in your DAW
- Octave folding (60–180 BPM) prevents half-time and double-time tempo confusion
Sub-Millisecond Beat Intervals & Confidence Metrics
Get the exact timing numbers required for professional audio engineering. Calculate beat intervals in milliseconds (e.g. 500 ms at 120 BPM) for delay sync, alongside honest DSP confidence scores.
- Sub-millisecond beat interval calculation for delay times, LFO rates, and sidechain timing
- Honest confidence percentage tells you when to trust the reading or adjust for rubato tracks
DJs & Live Performers
Verify downbeat positions and tempo grids to align transition cue points for flawless beatmatching.
Downbeat Phase Alignment
Music Producers & Beatmakers
Find exact millisecond beat intervals to synchronize stereo delays, tremolos, and sidechain compression.
Sub-Millisecond Beat Timing
Dancers & Choreographers
Count beats, identify strong bar accents, and rehearse choreography to visual tempo pulses.
Visual Pulse & Beat Count
Musicians & Songwriters
Check the exact tempo of demo bounces to set matching metronome speeds for acoustic rehearsals.
Instant Tempo Verification
Visual Beat Grid
Displays full waveform timeline with distinct downbeat and bar markers.
Sub-ms Intervals
Calculates exact milliseconds per beat for studio delay and LFO syncing.
100% Client-Side
Runs entirely in browser memory with zero server uploads and offline support.
Honest Confidence
Transparent percentage score guarantees you know when to trust the detected grid.
A beat finder analyzes an audio file to determine its tempo in beats per minute (BPM), calculates the millisecond interval between beats, identifies the timestamp of the first downbeat, and overlays a visual beat grid across the audio waveform.
KEEP GOING
Related tools
Take a generated song straight into the next step — lyrics, stems, length or vocals.
- Free Online BPM Tapper100% free with no sign-up. Tap the pad or press Space to calculate song tempo in real time. Accurate from the second tap.
- Key and BPM FinderDetect the musical key, Camelot wheel notation, and tempo (BPM) of any song in seconds. 100% on-device DSP, zero uploads, and unlimited batch analysis.
Turn your next idea into a song
Go back to the generator above and describe what you want to hear. Free to start, no production experience needed.