Chroma Doze

Paul Marks

About this app

Now you can sleep soundly with the soothing algorithms of Fourier analysis. Just sketch your favorite spectrum, and listen to a generated stream of white noise (or more precisely, colored noise). Use it with headphones to drown out neighbors, or tweak the settings to erode eardrums and frighten small children.

Notable features:
- No ads or weird permissions
- Doesn't just play a looped sample
- Relatively power-efficient
- Runs in the background
- Save your favorite sounds in the Memory list
- Contains math
- Open Source / Free Software (GPLv3 license)

Ratings and reviews

When a stand-alone noise machine isn't feasible for me, this has been my go-to app for years: rather than offering a bunch of canned (and, too-often, short-looped) sounds, Chroma Doze allows custom-shaped noise patterns to suit one's needs, which strikes me as ideal, since a one-size-fits-all approach hardly works for different situations and individuals. You might need to noodle around a bit to find the most-effective sound-masking effect, but the straightforward controls make this easy.

I should have rated this years ago. it's the only way I've found to make a custom white noise that sounds exactly like my Dohm fan machine. other apps have good white noise selections, but this one takes the cake for customizability and being open source! I just ran it overnight and it used 30 percent of my phone battery over 10 hours (playing to a Bluetooth speaker). Not bad.

would be interesting to see filters for the sound. ex: the noise becomes flowing water, wind, or something. also saved settings that you can select and load. that needs added, i would love that. edit: above review is from 6 years ago. save settings were indeed added, which was great. not much else has been done feature wise, but it gets the job done. also for all this time this app hasnt had any ads. ad-free white noise apps are as rare as it gets, so kudos to devs.