Hey, and welcome! 
NAS Guard is a native iOS app for keeping an eye on your TrueNAS box from your phone, without opening the web UI every time.
At a glance:
- Dashboard - CPU, temperature, memory, uptime and cores
- Pools & disks - capacity, pool status and per-vdev health
- Network & services - interfaces, traffic and running services
- Alerts - TrueNAS alerts pushed straight to your phone
- Control (optional) - power off/reboot, start/stop apps & VMs, manage services
- Extras: home screen widgets, multiple servers, Face ID lock, and an on-device assistant
This forum is the place to ask questions, share your setup and suggest features. Introduce yourself, and have a look at Help & Support to get started.
Glad you are here.