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Open source alternatives to Life360?
(pawb.social)
Big tech and governments are monitoring and recording your eating activities. c/Privacy provides tips and tricks to protect your privacy against global surveillance.
Partners:
I know this might not be an option for you, but I have used Home Assistant for this purpose. Simply install a HA instance and enroll both of your handsets with the companion app.
The challenge with apps like this is, that they need some kind of server by definition.
Let me know what you find.