After the last update, all of the information has been wiped out. I don’t have any more of the analytics on the Home Screen Like HRV, breathing, sleep assessment, etc. All I have is heart rate and check live measurements. When I tap on the circles, all I get is not enough data and I wear my ring all the time. The calibration period is done as well. I also can’t go back to look at any data from previous days, so unless you wake up at 11:55pm to analyze your limited data, you lose it all. I am very disappointed in how much I paid for the ring and how little value I’m getting out of it Update: they finally sent out some instructions on how to fix the issue but there are still lingering issues out there. Only increased the score to 3 as there is still much to be desired.

The content of the app is great. The navigation of it is ok, could definitely improve it. But the worst part is that it is terrible at syncing data. This goes two ways: it’s connected by Bluetooth, but for some reason it *frequently* can’t establish a connection. I simply don’t understand this, it’s basic functionality. But even worse than that: it is never synced with the servers. So first it has to pull data from the ring — it should be able to update your scores with this info, but it requires data from the servers. The server-side sync takes anywhere from 90 seconds to several minutes *when it works*. In order to sync, you need to have the app open and be doing nothing else (can’t start sync, check your email, then come back). You just sit there and stare at the screen. If it’s creating a workout report, it restarts the process multiple times. Once it took 30+ minutes. Why can’t the syncing occur in the background? I love having the ring and monitoring the scores — but I’ll be getting a different ring next time bc the most important thing (actually getting the information) only works 25% of the time.

For the first two months the ring would not communicate with the servers necessary for the app analysis to work. Then, it finally started working for about one week. Then as of this week, the ring once again will not sync with the app and servers. While I was generally impressed with the data when the ring did communicate. The inability of this company to actually ensure their device works is abysmal. I am now coming to the conclusion that I wasted my several hundred dollars. I'll never get my money back so I feel as though I've been cheated. I am now going to look into buying a ring from a more reputable company. PS be aware when you need to communicate with customer service and technical support it takes a week or so before you get a response. While I've read the company is aware of its growing pains, that is no excuse for the lousy customer service and lousy technical support provide provide provided. If you're reading this review, I would look elsewhere for your ring. Maybe one day they will get all their technical bugs worked out, but they shouldn't do it at my expense. As far as I'm concerned I've wasted several hundred dollars without recourse or redress.

Putting aside some infrastructure scaling issues the Circular team is working through, I still think this app and analysis algorithm requires significant improvement compared to the Oura experience.On the UX side, every time I edit the layout of my dashboard it seems fine but doesn’t save and reverts to the default view when you close and reopen the app. The version notes said this was fixed but it isn’t. I’m really starting to question the skill set of the developers involved in this product. Beyond that, comparing it to my use of the Oura ring, I don’t feel like the analysis is accurate. For example it tells me my ideal sleep duration is 6 hours. If I sleep for that little time I feel absolutely awful. Since it insists that’s correct, it’s inflating my sleep scores when I’ve only had mediocre sleep. Something is off about the calibration methodology that the ring already completed or analysis. Don’t expect that during calibration I’m ever going to sleep well. The app should still maintain the ideal for me and adjust as needed instead of baselining at an inaccurate value.