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

Noise library
- Forest set (birds bonfire night wind palm trees etc.)
- Monsoon set (rain thunders)
- Teleportation set (coffee shop office moving train in-flight seaside riverbank etc.)
- Raw noise (white pink brownian)

Permissions
- WAKE_LOCK: to keep device CPU awake during playback
- FOREGROUND_SERVICE: to run the player process (different than UI)
- RECEIVE_BOOT_COMPLETED: to ensure that wake-up timers persist across reboots
- ACCESS_NETWORK_STATE: added by a dependency currently not in use
- INTERNET: to enable Chromecast and financial contributions
- BILLING: to enable financial contributions for supporting development

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