BPMKeyFinder is an innovative SaaS tool designed for musicians, DJs, producers, and educators to quickly and privately analyze the BPM, musical key, and Camelot code of any audio track directly in their web browser. Leveraging Essentia.js, it offers a privacy-first workflow, ensuring professional-grade accuracy without uploading sensitive music files to external servers.

Key Features

• In-Browser Analysis: All processing happens locally on your device, ensuring complete privacy and no internet connection required for analysis.
• Field-Tested Accuracy: Utilizes Essentia.js for precise tempo and key detection, benchmarked in academic research and real DJ sets.
• Camelot & Musical Notation: Displays key in standard notation (e.g., C major) and corresponding Camelot wheel codes (e.g., 8B) for seamless harmonic mixing.
• Batch Processing (Pro): Queue multiple files for back-to-back analysis, ideal for managing large music libraries.
• Confidence Scores: Provides a confidence rating for each analysis, guiding users on the reliability of detected values.
• CSV Export & History (Pro): Export analysis results as CSV for syncing with DJ software like rekordbox or DAWs.

Use Cases

BPMKeyFinder is indispensable for Touring and Club DJs who need to verify track tempos and compatible keys for new promos or custom edits, ensuring musically seamless transitions on stage. Music Producers & Editors can align samples, stems, and cue points perfectly, quickly identifying if a vocal or instrument track needs transposition or time-stretching. Furthermore, Educators & Choreographers can provide students or dance teams with reliable BPM and key information efficiently, planning music for classes and choreography without requiring expensive software.

Pricing Information

BPMKeyFinder operates on a freemium model. The free tier offers 3 analyses per day with core BPM and key detection features. For power users, the Pro plan is available at $8/month, unlocking unlimited analyses, batch uploads, CSV export, analysis history, and priority email support.

User Experience and Support

The platform boasts a mobile-ready, fully responsive web interface, allowing users to easily upload tracks and review results from laptops, tablets, or phones. The drag-and-drop functionality makes loading audio files intuitive. Pro users benefit from priority email support, ensuring timely assistance for their professional workflows.

Technical Details

BPMKeyFinder's core analysis engine is powered by MTG's Essentia, compiled to WebAssembly (Essentia.js). This enables fast, on-the-fly, client-side processing directly within the browser, supporting common audio formats like MP3, WAV, FLAC, AIFF, AAC, and OGG.

Pros and Cons

• Pros:
  • Unmatched privacy: No file uploads, all processing is local.
  • High accuracy with Essentia.js engine.
  • Fast, in-browser analysis without internet connection.
  • Includes Camelot codes for harmonic mixing.
  • Batch processing and CSV export for Pro users.
  • Confidence scores aid in verification.
• Cons:
  • Free tier has daily analysis limits.
  • Does not support streaming audio or YouTube links directly.
  • Track length is limited by device memory (though most handle 20-30 min easily).

Conclusion

BPMKeyFinder offers a robust, private, and highly accurate solution for tempo and key analysis, essential for professionals in the music industry. Its unique in-browser processing and comprehensive feature set make it an invaluable tool for streamlining workflows and ensuring musical precision. Explore BPMKeyFinder today to elevate your music preparation.