Calm Sound Archive is an independent project about procedural relaxation audio. Every soundscape on this site is generated in the browser with the Web Audio API. There are no MP3 files to download, no streaming library, and no third-party master recordings behind the tracks. When you press play, the audio is built from oscillators and filtered noise in real time.
The archive is organised into eight acoustic pillars: rain and piano, solo instruments, nature and fire, meditation, sleep, ASMR, calming melodies, and space ambience. Each entry is a deterministic seed, which means the same seed number always produces the same piece of audio on any device. A seed carries its own tempo, scale, tuning, filter ceiling and stereo offset, and those values are printed on the page so you can see what you are hearing.
Why this exists
Most relaxation audio on the internet is either a short loop repeated until it frays, or a long file that has to be downloaded and stored. Neither is a good fit for a five-minute reset between meetings. We wanted something that starts instantly, never buffers, and can run for eight hours without a playlist. Generating the sound in the browser solves all three problems at once.
How the audio is made
Each pillar has its own engine family. Felt piano uses detuned triangle and sine oscillators with a soft hammer transient and a filter that closes as the note decays. Harp, koto and kalimba use Karplus-Strong plucked strings. Bowls and gongs combine a fundamental with inharmonic partials. Nature tracks are shaped noise: brown noise for fire, pink noise with a slow filter sweep for surf, bandpassed noise for rain.
The seed number drives a deterministic random generator, which sets the parameters for that track. Two seeds in the same pillar can sound quite different because the filter, tempo and tuning move independently. Nothing is randomised at playback time, so a seed sounds the same today and next month.
What we do not do
We do not publish sponsored gear reviews, paid rankings, or affiliate links disguised as recommendations. We do not make medical claims about the audio. The tracks are made for relaxation, focus and sleep routines, not for treating a condition. If you have a health concern, talk to a professional.
Who writes this
The site is maintained by the Calm Sound Archive editorial team. We build the engines, listen to the seeds on headphones, laptop speakers and cheap earbuds, and document the parameters openly. If something sounds wrong on your device, the contact page is the fastest way to reach us.