My friend and I were sipping flat whites last week when I spotted a chunky silver ring on her finger. No, not an engagement ring; not an Oura Ring; but the budget prxxhri smart ring, now down to $53.99 at Amazon.Now, I'm the biggest advocate of my Oura Ring. If you'll allow me, I'll gladly talk your ear off about how it's the best sleep tracker you can buy (honestly, I'm a hoot at a party). But comparing my pricier Oura Ring 4 with my friend's Amazon bargain, I was dumbfounded by the surface-level likeness between the two.If you're on a budget and looking for a subscription-free Oura Ring alternative to help you track and improve your sleep, I'd certainly recommend it. But don't wait around, as right now the prxxhri Smart Health Ring is at an all-time lowest price in the Memorial Day sales. Here's how it works, along with how it compares to the Oura...Looking to upgrade your sleep space? Check out our guide to the best Memorial Day mattress sales for all budgets. We're also tracking this year's best Memorial Day mattress deals and sleep tracker and bedding sales live.What is the prxxhi Oura Ring alternative?The prxxhri ring is essentially a dupe of the world's most popular smart ring, the Oura. It has a titanium outer shell with sensors sitting on the inside of the ring, collecting health data from your finger.As Oura Ring alternatives go, the prxxhri is one of the good ones, sporting hundreds of positive reviews on Amazon. Customers say it's comfortable to wear overnight and provides useful sleep insights.Trust me, I've combed the reviews section of many a budget smart ring and there's not many that get such praise, if any praise at all.The prxxhri ring is available in six size options (there's detailed size chart on Amazon to help you find the right fit) and three colorways — silver, black, and rose gold.It's compatible with iOS and android, and lined with sleep tracking sensors that deliver data about your sleep duration, sleep cycles, and overnight heart rate, as well as awarding you an overall sleep quality score. By day, it tracks your steps, calories, and exercise activities.How does the sleep tracking compare to the Oura Ring?