Free browser-based audio tools for finding and changing song key and BPM
Free, open-source, node-based audio routing for macOS, Windows and Linux
Stage
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Founded
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Based in
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Pricing model
Freemium
Open source
Pricing
Free plan includes Key & BPM Finder and Changer, Audio Cutter and Joiner, BPM Tapper and Metronome, Voice Recorder, and local processing tools with files saved for 6 hours. Plus plan: $9.90/month with 1,000 credits per month and files saved for 7 days. Pro plan: $19.90/month with 2,500 credits per m
Free. Source code available under MIT license on GitHub.
Key features
Detect song tempo, musical key, scale and Camelot code
Change key and BPM independently and export as WAV
Cut and join audio segments
Record voice and tap beat timing
Practice with online metronome
Remove vocals from songs
Split songs into instrument stems
Enhance audio quality with AI
Convert audio to editable MIDI
Node-based audio routing graph
Unlimited virtual audio devices
System audio and per-app audio capture
Microphone capture with noise suppression, gate, compressor and EQ
CLAP, AU and VST3 plugin hosting
Multi-format recording including WAV, FLAC, AIFF, Opus, MP3, AAC
Audio streaming over network via WebRTC and UDP
Real-time resampling between different sample rates
What makes it different
Process audio locally in browser without uploading to servers
No file storage or account required for free tools
All free tools with privacy-first design
Direct export from browser without server processing
Works on macOS, Linux and Windows with the same node graph approach
No kernel extension required on macOS
Open source under MIT license with full source code on GitHub
Includes built-in effects and supports third-party VST3, AU and CLAP plugins
Can record while routing audio in real time to multiple formats
Key & BPM Lab
Splitwave