About Online Web Harmonium
Why We Built This
The web harmonium is central to Indian classical music, devotional kirtan, Sufi qawwali, and folk traditions across South Asia. Yet a real harmonium can be expensive, bulky, or simply unavailable in many parts of the world. We built Online Web Harmonium so that anyone with a web browser — a student in Berlin, a devotee in Toronto, a teacher in Mumbai — can access this beautiful instrument instantly.
What You Can Do
Play using your computer keyboard, mouse, touchscreen, or MIDI controller. Adjust octave, transpose, reverb, and reed layers to match your vocal range or practice needs. View Sargam notation on every key. Switch between light and dark modes. Use keyboard shortcuts for fast adjustments during live practice sessions.
How It Works
Sound is generated entirely in your browser using the Web Audio API. Synthesized free-reed tones are shaped by bandpass filters and ADSR envelopes to replicate the warm, breathy timbre of a real harmonium. A convolution reverb adds natural room acoustics. Preferences (volume, reverb, octave) are saved in your browser's local storage and never sent to any server.
Who It's For
Students learning Indian classical music and needing a drone or accompaniment instrument. Vocalists checking pitch before rehearsal. Teachers demonstrating scales and ragas in lessons. Devotional singers preparing bhajans and kirtans. Producers wanting authentic harmonium tones. Curious listeners exploring Indian music for the first time.
Project Background
Online Web Harmonium was created to fill a gap: there was no high-quality, free, browser-based harmonium that sounded authentic and worked reliably across all devices. We built it as a modern web application using Next.js and the Web Audio API. The project is actively maintained and updated based on feedback from musicians worldwide.
Design Philosophy
A music tool should get out of your way. The interface is intentionally minimal — no pop-ups, no mandatory sign-ups, no interruptions. You open the page and start playing. The instrument is fully responsive, adapting from a large desktop display down to a phone screen, while preserving playability at every size.