Free browser-based audio tools for finding and changing song key and BPM
Free 3D room acoustics solver and acoustic treatment calculator
Stage
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Founded
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Based in
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HU
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
3D room builder supporting odd-shaped rooms, sloped ceilings, and attic layouts
Real physics-based acoustic treatment recommendation
Material absorption modeling with coefficients from frontier research
Real product database with 175 products across 37 brands
Before-and-after frequency response and decay time visualization
Studio mode for production work alongside listening room workflow
Rapid analysis completing in 2-10 seconds for position searches and up to a minute for panel placement
Guest access without account signup for full analysis
Room design persistence with optional account creation
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
Uses real room physics and first principles acoustics rather than generic rules
Optimizes for both speaker placement and listening position simultaneously
No account or sign-up required to design and analyze full systems
Handles complex room geometries including sloped ceilings and L-shaped layouts
Integrates real speaker and equipment products with audio system design
Key & BPM Lab
roomtreatment.diy