Free browser-based audio tools for finding and changing song key and BPM
Audio gear reviews built from independent sources, with consensus on what reviewers agree about.
Stage
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Founded
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Based in
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Pricing model
Freemium
Free
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
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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
Aggregates independent reviews from multiple sources
Shows where reviewers agree and disagree on products
Names reviewer camps instead of averaging opinions
Includes 566 products across headphones, IEMs, speakers, amps and DACs
Audio dictionary with 44 listening guides and 265 definitions
Side-by-side product comparison tool
Longer essays (Overtones) drawn from reviews and dictionary
Machine synthesis of human reviews with published weights
All claims link back to original sources
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
Shows genuine disagreement between reviewers rather than averaging opinions into bland consensus
Built from 19,395 independent sources with transparent weighting of affiliated or copied reviews
Explains why reviewers disagree, such as fit and ear shape differences
Updated live as new reviews are added to the catalogue
No manufacturer payment or review approval process
Key & BPM Lab
Audiowords