I just gave this app a try it doesn't seem like an out-right scam to me. It has 20,000 reviews and plenty of them look like they're written by real humans that

I just gave this app a try it doesn't seem like an out-right scam to me. It has 20,000 reviews and plenty of them look like they're written by real humans that actually appreciate the app. The app also works with other bluetooth SpO2 sensors, and I believe that Apple's official "Blood Oxygen" app is only available if you have an Apple Watch! (Though in either case presumably the app is just leveraging iOS's built in functionality?). Also the app seems to focus on data sharing which Apple's Blood Oxygen and Health apps don't provide. There are some 1 star reviews, but they seems mainly from people that are upset this app can't track SpO2 by itself without a watch or other hardware. Also the app works fine without a subscription. It does aggressively prompt you to subscribe when you first open the app so it might not have been clear it was optional. Making this non-obvious is sketchy. Subscribing enables Apple Health syncing, sharing, and stats. There's plenty of out right scams on the App Store but this doesn't seem like one.