I miss the Zeo. The app would still work locally long after they shut the backend down, until there just was no more aftermarket / eBay supply of their unique s

I miss the Zeo. The app would still work locally long after they shut the backend down, until there just was no more aftermarket / eBay supply of their unique silver coated contact padded headbands that actually did the brainwave monitoring. I do find the Apple Watch Ultra seems to be close to at least being in the ballpark in terms of stage and duration accuracy as its output is comparable to what I last got with Zeo, albeit 10 years ago.