While AsteroidOS doesn’t have the same sophistication and app support as Wear OS, there’s a lot to like in this open source effort, and it’s improving all the time. If you’re a little disillusioned with Wear OS and want to support an independent project, we think you’ll enjoy spending some time with AsteroidOS, as long as your smartwatch supports it — just be prepared to miss out on some functionality along the way for now.

AsteroidOS is a smartwatch operating system that wants to offer an alternative to Google’s Wear OS. If you’ve got a compatible smartwatch, you can try out the OS now and even get it running alongside Google’s smartwatch software if you want to.
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https://www.wareable.com/smartwatches/asteroid-os-review