BPMKeyFinder is a privacy-first, in-browser SaaS tool designed for precise audio analysis. It allows users to quickly measure the tempo (BPM), musical key, and Camelot code of any audio track without uploading files to a server. This essential tool empowers touring DJs, music producers, editors, and educators to streamline their workflows with reliable, on-the-fly music metadata.

Key Features

• In-Browser Processing: All analysis happens locally on your device, ensuring complete privacy and no file uploads.
• Field-Tested Accuracy: Leverages Essentia.js for robust BPM and key detection, benchmarked in academic research and real DJ sets.
• Comprehensive Output: Provides BPM, musical key (e.g., C major), Camelot code, major/minor mode, track duration, and confidence ratings.
• Batch-Friendly Workflow: Queue multiple files for back-to-back analysis, processed client-side without throttling.
• Accurate BPM Normalization: Adjusts detected tempos to a usable 60-180 BPM range, while also showing raw estimates.
• CSV Export & History (Pro): Pro users can export analysis results as CSV for syncing with DJ software like rekordbox or DAWs.

Use Cases

BPMKeyFinder is indispensable for professionals needing quick and accurate music data. Touring DJs confirm track tempos and compatible keys for seamless transitions. Music producers align samples and stems, quickly identifying transposition or time-stretching needs. Educators and choreographers provide students with reliable BPM and key information for efficient class and choreography planning.

Pricing Information

BPMKeyFinder operates on a freemium model. A free tier offers 3 analyses per day with single-file uploads and core BPM/key detection. The Pro plan, at $8/month, unlocks 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, optimized for various devices, allowing users to easily upload tracks and review results on the go. The drag-and-drop functionality ensures a smooth and intuitive user experience. Pro users receive priority email support.

Technical Details

BPMKeyFinder's core analysis engine is powered by MTG's Essentia.js, a renowned Music Information Retrieval (MIR) toolkit compiled to WebAssembly. This allows for fast, on-the-fly analysis directly within the browser, eliminating the need for an internet connection during processing and ensuring that audio files never leave the user's device.

Pros and Cons

• Pros:
  • Exceptional privacy (local processing).
  • High accuracy with Essentia.js.
  • Fast, in-browser analysis without internet.
  • Comprehensive output (BPM, key, Camelot, confidence).
  • Mobile-ready and user-friendly.
• Cons:
  • No streaming audio or YouTube link analysis.
  • Track length limited by device memory.
  • Complex tracks may need manual verification.

Conclusion

BPMKeyFinder offers an invaluable, privacy-centric solution for anyone needing reliable tempo and key data for audio tracks. Its blend of academic-grade accuracy and a secure, browser-based workflow makes it an essential tool for professional music preparation. Explore BPMKeyFinder today to streamline your music library management and enhance your creative projects.