Seconding Updown. Easy setup, pay-as-you-go, no nonsense. I wish they had a better way to hit your phone. Currently it supports Slack and SMS but I need a way

Seconding Updown. Easy setup, pay-as-you-go, no nonsense. I wish they had a better way to hit your phone. Currently it supports Slack and SMS but I need a way to make my phone go crazy when things go wrong (you can set Updown as an emergency contact but this has many downsides as well).