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Critical notifications in Home Assistant
(companion.home-assistant.io)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
At least on Android, you can make TTS go through your alarm channel on your phone at max volume, to really make sure you don't miss it. I do this for my alarm and doorbell (only when I'm at home).