Detect the exact BPM tempo and musical key scale of any song or sample online for free. Instant in-browser audio analysis for DJs and beatmakers.
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What is the BPM & Key Finder?
The LimeWire BPM & Key Finder is an in-browser acoustic analysis tool for DJs, beatmakers, and sound designers. It performs real-time algorithmic onset detection and harmonic chroma analysis to calculate the exact beats-per-minute (BPM) tempo and root musical scale (Key) of any audio file, including Camelot Wheel notation for harmonic mixing.
How to Find BPM and Key of a Song in 3 Steps
- 01
Drop Your Audio Track
Upload any MP3, WAV, or audio sample into the analyzer workspace.
- 02
Instant Frequency Analysis
The browser-native engine analyzes transients and harmonic pitch structures within 2 seconds.
- 03
View Tempo and Key
Get the precise BPM, root musical scale (Major/Minor), and Camelot Wheel code to match your DJ sets.
Tool Specifications
Who Uses the BPM & Key Finder?
DJs & Mixers
Identify compatible musical keys (Harmonic Mixing) to blend songs seamlessly in live sets without dissonant clashing.
Beatmakers & Producers
Instantly tag your sample packs and drum kits with accurate BPM and root keys for selling on marketplaces.
Vocalists & Songwriters
Determine the exact scale of a backing beat to set Auto-Tune key parameters and vocal harmonies correctly.
Everything you need to know
How accurate is the BPM detection?
The algorithm detects tempo with 99.5% accuracy on electronic, hip-hop, pop, and rock genres with clear transient beat structures.
Does it display Camelot Wheel notation for DJs?
Yes! Along with standard notation (e.g., A Minor), the tool displays the corresponding Camelot mixing code (e.g., 8A) for Rekordbox and Serato users.
Is there a limit on song length?
No, you can analyze short 2-second drum loops or full 10-minute DJ set recordings directly in your browser.