For a lot of people a little background noise is helpful to calm down and focus. In some cases it's also a boost to productivity. Background noise (ambience) can also help minimize the effects of stress.

Noice is an app that allows you to create a customised ambience using clips from environmental noise sources. Create your perfect surroundings by combining different sounds to drown out distractions so you can focus on your work or generate serene peaceful environments that encourage you to fall asleep.

Features
- 35 recorded noises
- Google Cast (Chromecast) enabled [Play Store release only]
- Auto sleep timer
- Wake-up timer (Alarm Clock)
- Generate random mixes
- Make a customised mix
- Save your favourite mixes
- Play alongside other music players
- Individual volume control for each noise source
- Offline playback
- Light and dark app theme variants

Noise library
- Life set (birds crickets wolf human heartbeat etc.)
- Forest set (bonfire night wind palm trees etc.)
- Monsoon set (rain thunders)
- Teleportation set (coffee shop library office seaside riverbank etc.)
- Vehicle set (moving train in-flight creaking ship electric car etc.)
- Raw noise (white pink brownian)

Permissions
- prevent device from sleeping: to keep device CPU awake during playback
- run foreground service: to run the player process (different than UI)
- run at startup: to ensure that wake-up timers persist across reboots
- full network access: to enable Chromecast and financial contributions
- view network connections: added by a dependency currently not in use
- Google Play billing service: to enable financial contributions for supporting development

Noice is free and open-source software.
https://github.com/ashutoshgngwr/noice