Credits

Pulse exists because of work done by other people first. The frequency catalog, the original web audio synthesis approach, and a substantial amount of the underlying thinking trace back to a single open-source project. This page is where I credit that lineage honestly.

The original work

JTruax/resonance-sound-frequencies — the canonical original, released under the MIT license.

I came across this project when I was looking for a simple way to play therapeutic frequencies in a browser, and what JTruax built is the rare thing in this space: a clean, technically honest tool that takes sound seriously without dressing it up in spiritual marketing. The repo includes not just working code but a substantial academic knowledge base — 29 cited sources covering the research on the frequencies in the catalog. That kind of intellectual rigor in a free open-source sound app is unusual and genuinely valuable.

Almost everything good about Pulse's foundation comes from this work:

• The frequency catalog and its category structure
• The original web audio synthesis approach using pure sine generation
• The thoughtful documentation of research sources alongside cultural traditions
• The conceptual model of layered tones, session timers, and binaural presentation

Pulse extends this in specific directions — amplitude modulation for sub-audible frequencies through powered subwoofers, refined preset curation, the PWA shell, an updated visual language — but the core synthesis engine and the editorial spirit are JTruax's. I'd encourage anyone interested in the underlying approach to visit the original repo, read the source code, and look at the academic knowledge base directly.

The fork lineage

Pulse's code began as a fork of metakai1/resonance-sound-frequencies, which is itself a fork of the JTruax original. The lineage is preserved in commit history and license. The MIT license travels with the work; the gratitude does too.

Open source ethic

Pulse itself is not currently open source — the brand, the curated content, the editorial decisions, and ongoing development happen in a private repository. But the synthesis engine and frequency math it inherits are MIT-licensed and remain so. If you're building something similar and want to start where I started, JTruax's original repo is exactly the right place to begin.