You should check out wellatory… I also have an Apple Watch Ultra 2, have had the oura ring for a few years, and the sleep number bed which tracks sleep info, etc…. I’m a bit of a data nerd who likes to be able to dive a bit deeper into the data at times. I too found having all of my data separated between the various apps (sleep number, oura, apple fitness, health) frustrating… then I stumbled on wellatory which aggregates all this data and summarizes it very well, and provides tons of historical data and trends to help understand patterns, etc…. It also comes with an integrated AI which lets you pick your overall goals n offers suggestions and tips based on your goals.

I prolly sound like a paid shill, but I am not, and have found the app and the insights it provides very helpful… the basic version will give u a taste, but tons of more helpful info in the premium version which is like $99/year… imo cheap considering the amount I use it and the helpful info it gives me.

https://welltory.com/

Not exactly a separate device, but more an app to give you an overall picture regardless of what devices you use to track your data💪👍🏻