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FROM apple.com/homekit
Apple HomeKit is the underlying technology for smart home control in the Home app on iPad, iPhone and Mac devices, or through HomePod smart speakers. It started life as a niche system, with extremely limited hardware support, as Apple required hardware encryption to be used. It has since relaxed this, and software updates can be applied to make devices compliant with HomeKit.
That has improved device support to a degree, but HomeKit still lags behind its rivals for compatibility. And, as it only works on Apple devices, it limits its use in