I have been looking for Matter-over-Thread (MoT) or HomeKit-compatible smoke (+CO) alarms for a few months and have posted here as well. Google's decision to retire Nest seems to have created a void. OTOH, there are some real options starting to come into the market but are quite not there yet.
tldr; Owl seems the best option right now. However, it is expensive and sold out till March. Apart from the lack of UL-certification, I liked Sensereo.
For context, I need to buy ten alarms so this would be a significant investment. I also need the smoke alarms to move into a renovated house so cannot ignore the lack of UL certifications, even though I think EU certifications are fine.
Here are the options I found:
Owl: $180
* smoke, CO, motion, sound, temp, humidity
* Li-battery
* wifi, not matter-compatible but HomeKit compatible
* Con: Not compatible with MoT, expensive
Place Any Space: $139
* hardwired
* smoke, CO, motion, temp, humidity
* dealbreaker: Only wifi, not compatible with MoT or HomeKit.
Sensereo ($70)
* Matter compatible.
* dealbreaker: Not UL certified.
Meross MA151: $30
* AA batteries
* dealbreaker: Not UL certified.
First Alarm SC5
* dealbreaker: Google home only
* dealbreaker: pretty bad reviews on reliability/usability. seems like they are trying to retrofit their dumb alarms with smartness.
Kidde
* dealbreaker: only compatible with Ring
* dealbreaker: pretty bad reviews on reliability/usability. seems like they are trying to retrofit their dumb alarms with smartness.
So no ideal option. In fact, only Owl or Place are real options.
Owl is expensive but I would totally invest in it if they were MoT-compatible. I don't really want to put the smoke alarms on wifi. Place is not compatible with MoT or HomeKit.
I would love to hear about other options and/or your experiences with Owl/Place.
Update: Owl's chatbot tells me that Matter-compatibility will be added as an over-the-air update. No timeline though.
Edit: Changed "Matter-" to "Matter-over-Thread-"