Car immobiliser - what's highly regarded?

[seadragon]

Dont want a tracker with the annual subscription costs. Want something super up to date and can work with phone app ideally. Have come across the Autowatch Ghost but hard to find anyone to install in my area.

Dont want my car wires cut or fiddled with too much. It's not a super expensive car but I still don't want it stolen.

Any ideas much appreciated, thanks