The best smart rings, ranked on what they cost to own

How to use these rankings

Every list in this section ranks the same small group of rings sold to US buyers: Oura, RingConn, Samsung's Galaxy Ring, Ultrahuman and Circular. What changes from page to page is the question being answered. If you're not sure where to start, start with the best smart rings without a subscription, the ranking this whole site is built around. If you want the whole market, Oura included, read the best smart rings, which names a pick whether or not you'll pay a fee. From there, narrow by who you are and what you want the ring to do: the best smart rings for women and the best smart rings for men rank on size range and fit, the best smart ring for sleep tracking ranks on sleep evidence, and the best smart ring for weightlifting deals with barbells and covers.

Two more entry points, depending on why you're here. If you already own a ring and want out of its fee, the best Oura Ring alternatives and the best Galaxy Ring alternatives rank the field from that side. And if you're shopping for a specific job rather than a brand, we have pages for the harder ones: cycle and fertility tracking (where the cleared route costs two subscriptions, not one), running and swimming (where we tell you plainly what a ring can't do), and under-mattress sleep trackers if the real goal is sleep data with nothing on your body at all.

Settle the fee question first

The biggest difference between smart rings isn't a sensor. It's whether you keep paying after checkout. Oura needs a membership for most of its insights; without it, Oura says you see three daily scores plus battery, profile and settings. RingConn, Samsung and Ultrahuman require no fee, and Circular says it has no forced subscription. Decide this before you fall for a feature, because it rules out half the market in one step and it keeps costing you for as long as you wear the ring. Our breakdown of what a smart ring really costs over three years multiplies every brand's fee out, so the comparison is the ring price plus a number you can see.

If you've already decided a monthly bill for your own sleep data is a dealbreaker, the rankings here give you plenty to choose from. If you're willing to pay, several pages name the best-evidenced option for you too, and say plainly what the fee buys.

A ring isn't the only way to refuse a fee, either. If you'd rather not wear anything on a finger, best fitness trackers with no subscription ranks the three non-ring wearables we found whose makers put the sensor's own numbers in a free app.

iPhone or Android changes the list

Your phone removes rings before anything else does. The Samsung Galaxy Ring works only with Android, and some of its features, including Find My Ring and Energy Score insights, need a Samsung phone. RingConn needs iOS 17 or Android 10 or newer. Oura works on both. Ultrahuman doesn't state the Ring PRO's phone requirements on the US pages we checked. The best smart ring for iPhone and the best smart ring for Android rank each side separately.

Size before you shop

No brand says its sizes match another brand's, and several say outright that theirs differ from standard ring sizes. Oura even says its sizing differs between its own generations. So your jewelry size is a starting guess, not an answer. Every brand ranked here offers a sizing kit; use the one for the ring you're actually buying. Size ranges also differ: some rings start at 4 or 5, and only three go up to 15. Our smart ring sizing guide walks through the kit, and the women's and men's rankings above cover the small and large ends. Where you buy decides how you get sized in the first place - brand stores hold the order until you confirm a size, while Best Buy and Target let you try a kit in person - so read where to buy a smart ring before you choose a checkout.

Read battery claims as claims

Every battery figure on these pages is the maker's claim under the maker's conditions, and we label it that way. Some brands tie it to ring size: Samsung rates smaller Galaxy Rings at a day less than sizes 12 and 13, and Oura qualifies its Ring 5 figure with “depending on ring size and usage.” Where a named reviewer reported a real-world figure, we cite it. A charging case changes the picture more than a day or two of claimed battery; several rings include one. Our smart ring battery life guide reads each claim with its fine print.

What “best” means on this site

“Best” here is an editorial ranking from a published rubric: cost of ownership over three years, published accuracy evidence, claimed battery, sizing and fit, data ownership and phone support, with the weights and reasoning on our methodology page. Every fee, spec and study is linked to its source. When a page ranks a ring out of score order because of what that page is about, it says so and says why. For the published studies behind the evidence scores, see how accurate smart rings are, and for every spec side by side, the smart ring comparison chart.

Shopping for someone else? The smart ring gift guide starts with the sizing problem, the gifts for smart ring owners page covers people who already have one, and the best budget smart rings covers the lower end of the market. If your budget is firmly under $100, read best smart rings under $100 first: no brand that publishes its specs sells one at that price, and we explain what the cheap listings leave unverified.

Buying for one feature? Those searches usually end in a short answer, so we wrote them out: no ring measures blood sugar, so glucose monitoring is really about which ring pairs with a real sensor; no ring reports a blood pressure number, which is what blood pressure monitoring covers; exactly one ring takes an ECG; none has a display worth buying; and none takes NFC payments yet. Garmin owners should start with the Garmin page, since Garmin sells no ring and no ring syncs to Garmin Connect. If you would rather wear a watch to bed, best smartwatches for sleep tracking ranks those, and if the budget is the constraint, best smart rings under $200 is the band above our under-$100 page.