UPSnut

UPSnut can be used to retrieve UPS status information, like battery charge level, battery voltage, time on battery and so on, from a NUT (Network UPS Tools) server that has an UPS (Uninterruptible Power Supply) hooked up to it.

Features:
- App supports the latest NUT server and is compatible with all iPhone running iOS 13 or higher.
- IP/Hostname/Domain of server to connect to can be changed at any time in Settings page.
- Dark mode is supported

Requirements:
- Any UPS compatible with NUT
- Server - this can be any device that can host the NUT service (Note: you can not run the server on an iPhone, the phone is just the client. You can use an embedded device, such as a Raspberry Pi)
- your phone

For information regarding set up of the NUT server, please check the project's site: https://networkupstools.org

Support: 
UPSnut (the iOS app) is a fully compatible, but unofficial client developed to allow your device to connect to NUT servers.  
No support will be provided for bugs in NUT server, but only for bugs related to this iOS app.