Currently, I use myNoise by myNoise BV and White Noise Generator by AMICOOLSOFT.
myNoise
- rain, waves, white noise, binaural beat, warp speed and many more
- new sounds can be downloaded inside the app
- adjust the color (e.g. Infra, Speech, White, Brown) and the frequencies of the sound
- save your own custom preset
White Noise Generator
- waterfall, cave, river, wind, fan, train, lawnmower, chimney fire and many more
- mix the sounds and adjust the volume of each sound separately
- set a (sleep) timer
Play the sound of the generator app in the background or over headphones. You can combine the sound masking sounds with other strategies to combat noise.
Although I posted this thread in Autism, the white noise generator apps can also help if you have conditions like ADHD, High Sensitivity, misophonia, (social) anxiety or tinnitus.