Sound credits
Every sound on this site, where it comes from and the licence that lets us use it.
Generated in your browser
These sounds aren’t recordings. Our own code calculates them on your device when you first switch them on, so nothing is downloaded and there is no third-party licence. They are part of the FocusLoop site.
| Sound | How it is made |
|---|---|
| Brown noise | Leaky-integrated white noise, DC removed, 10 s stereo buffer with a 0.5 s equal-power loop cross-fade, normalized. |
| Pink noise | White noise through Paul Kellet's refined pink-noise filter, 10 s stereo buffer with a 0.5 s loop cross-fade, normalized. |
| White noise | Uniform random samples, 10 s stereo buffer with a 0.5 s loop cross-fade, normalized a little quieter than the others. |
| Rain | Band-limited pink noise (350 Hz to 7 kHz) plus about 90 short filtered noise bursts per second as drops; 12 s stereo loop, cross-faded, normalized. |
| Fireplace | Low-passed brown-noise rumble plus random crackles (about 14 per second) and occasional pops; 12 s stereo loop, cross-faded, normalized. |
Recordings
These recordings were released under the Creative Commons CC0 1.0 Universal Public Domain Dedication, so no attribution is required. We credit the recordists anyway and link to the originals. We checked the licence on each sound’s Freesound page on the date shown.
| Sound | Original | Recordist | Licence | Checked | Our edits |
|---|---|---|---|---|---|
| Café | Freesound page | Talitha5 (Freesound) | Creative Commons 0 (CC0 1.0 Public Domain Dedication) | 2026-10-20 | Freesound high-quality preview (MP3, 30.9 s) mixed to mono, first 27.9 s made into a seamless loop with a 2.5 s equal-power cross-fade, loudness-normalized to about -20 LUFS, encoded as Opus/WebM (48 kbps) and AAC/M4A (64 kbps). |
| Forest birds | Freesound page | SamsterBirdies (Freesound) | Creative Commons 0 (CC0 1.0 Public Domain Dedication) | 2026-10-20 | Freesound high-quality preview (MP3, 9 min 49 s) mixed to mono; the steadiest 75 s (from 0:23) chosen by loudness variation and made into a seamless loop with a 2.5 s equal-power cross-fade, loudness-normalized to about -20 LUFS, encoded as Opus/WebM (48 kbps) and AAC/M4A (64 kbps). |
Chime and tick
The alarm chime and the optional tick are short tones synthesized in your browser by our code. They aren’t recordings.
Spotted a problem with a credit? Tell us via the contact page.
Updated · Written by the FocusLoop team