CleanTone

CleanTone is a browser-based audio enhancement app that cleans up instrument recordings in real-time—you upload an MP3 or WAV, click enhance, and it removes background noise, boosts clarity, cuts rumble, and normalizes volume, all without uploading anything to a server. Everything runs locally in your browser using Web Audio API and a custom FFT-based spectral denoiser. The biggest challenge was making the enhancement actually audible—the initial implementation was technically correct but barely noticeable, so I rewrote it to learn from the quietest 12% of frames, which suddenly made the 15-20dB improvement immediately obvious. I'm proud that the audio actually works (that SNR improvement is real, not marketing fluff), your audio never leaves your device (entire processing happens in seconds), and the attention to detail throughout—visual feedback for everything, helpful error messages that tell you exactly what went wrong and how to fix it, and full keyboard support with Ctrl+E to enhance, Ctrl+R to reset, Ctrl+S to download. To test it: clone from https://github.com/manayparikh1/CleanTone, run npm install && npm start, open http://localhost:3001, upload any MP3 or WAV file (phone recordings or live instruments with room noise work best), try different presets (Balanced, Voice, Strings, Wind, Max Clean), A/B compare the waveforms and audio, adjust sliders to fine-tune, click any stat to copy it, and listen for the hiss to vanish while the instrument gets clearer and louder. The app is completely private, open-source, and free—no accounts, no tracking, nothing uploaded anywhere. And AI such as Claude and Github Copilot aided me a lot in debugging and coding etc.