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Deep and soft — the least fatiguing of the three over a long stretch.
Brown noise puts most of its energy in the low frequencies and rolls off sharply as it climbs, which is why it sounds like a distant waterfall or the inside of an aeroplane rather than a hiss. Compared with white noise it is much softer on the ears, and that difference is what makes it the one most people can leave on for a whole working day or a whole night.
It is a good sound floor for deep work, for sleeping through street noise, and for damping the kind of low-level clatter that a shared space produces. It masks rumble and general activity better than it masks speech — for voices, white noise is the more effective choice.
The sound is synthesised by your browser rather than streamed from a file, so there is no loop point to notice, no buffering and no data cost while it plays. Leave it running for eight hours if you want to; it is generated continuously and released under CC0.
Use the sleep timer if you want it to stop on its own, and keep the volume low — just enough to cover what you are masking.
Most people find it easier to sleep to, because the high frequencies that make white noise feel harsh are largely absent. Which one works is individual, and both are free here — try each for a night.
No. It is generated as it plays rather than played back from a recording, so there is no repeating segment to start noticing.
The generated channels are CC0 public domain, and tracks offer a download button in the player.