> other smart rings like Oura cost $250+
It's crazy they manage to say this with a straight face when their product still costs $225. Gee, $225 for a disposable piece of e-waste or $250 for a rechargeable device... but hey, at least it reminds you with an advertisement to spend another $225 before it dies!
From the website it seems the ring is $75. So definitely cheaper
The Oura Ring costs $350 now and it has an optional $6/month subscription.
Also, rechargeable does not mean it is infinitely rechargeable. After around four years, the Oura's battery will not hold a charge long enough to be useful (record a night's sleep), so it is also disposable.
We are comparing apples and oranges though because the Index is not a smart ring.