Best Smart Rings (2026): Top 8 Compared

Oura Ring 5 is the newest ring from Oura Health, the Finnish company whose earlier rings did much to define the category. Oura describes it as the world's smallest smart ring and says it is 40% smaller than Oura Ring 4. The published dimensions are 6.09 mm wide and 2.28 mm thick, with weight starting at 2 grams depending on size.

The sensor set matches the rest of the Oura range: red and infrared LEDs for blood oxygen, green and infrared LEDs for heart rate, heart rate variability and respiration rate, a digital temperature sensor for temperature trends and an accelerometer for movement. The exterior and interior are titanium, and Oura rates the ring waterproof to 100 metres with an IP68 rating for water and dust.

Oura states battery life of 6 to 9 days depending on size and use, and a full charge in about 80 minutes. A separately sold Oura Ring 5 Charging Case can add a full day of use in about 10 minutes, according to the product page. Sizes run from 6 to 13 with no half sizes, and Oura recommends its sizing kit.

The app works on iOS and Android, integrates with more than 100 apps and covers readiness, sleep, activity, stress, heart health and women's health. Oura states that without a membership the ring works with limited functionality.

Oura Ring 4 remains on sale alongside Oura Ring 5 at a lower starting price. Oura describes it as fully titanium inside and out, with a round interior and recessed sensors, and sells a separate Oura Ring 4 Ceramic model with a zirconia ceramic exterior.

The published sensors are red and infrared LEDs for blood oxygen, green and infrared LEDs for 24/7 heart rate, heart rate variability and respiration rate, a digital temperature sensor and an accelerometer. The ring is 7.90 mm wide and 2.88 mm thick and weighs 3.3 to 5.2 grams depending on size. Oura rates it water resistant to 100 metres.

Battery life is stated at 5 to 8 days depending on size and settings, with charging in 20 to 80 minutes on a size-specific charger that comes in the box with a USB-C cable. Sizes run from 4 to 15, and Oura recommends its sizing kit because its sizes differ slightly from standard ring sizes.

Oura lists features including Sleep Score, sleep stages, nighttime breathing, readiness, daytime stress, resilience, cardiovascular age, cardio capacity and cycle insights. Oura states that its Natural Cycles integration syncs temperature data to that FDA-cleared birth control app. Full use of the app requires Oura Membership.

Ultrahuman is an Indian health technology company whose US store now leads with Ring PRO, a unibody titanium ring positioned above the lighter Ring AIR. The US comparison table lists Ring PRO at $479 and Ring AIR at $349, and the Ring PRO order page includes a PRO charging case at no extra cost.

Ultrahuman states Ring PRO battery life of up to 15 days, with about 12 days in Turbo Mode and more than 15 in Chill Mode, and up to 45 days of charging from the PRO case. The ring stores up to 250 days of data and the case up to a year. Sensors listed are temperature, a redesigned PPG sensor and a 6-axis IMU, with a dual-core processor and on-chip machine learning. The ring weighs 3.3 to 4.8 grams, is about 2.65 mm thick and is rated to 100 metres.

Sizes run from 5 to 14 with no half sizes, and a free sizing kit ships first. Ultrahuman's ring FAQ lists compatibility with iOS 15 or later and Android 6 or later for Ring AIR.

Ultrahuman states there is no recurring fee to access ring data. Optional PowerPlugs add specific features for an annual fee, and the company's Jade AI assistant is offered as a platform upgrade for all users.

RingConn is a smart ring brand that sells its rings without a subscription. Gen 3 is its newest model, listed at $349 on the US store, above Gen 2 at $299 and Gen 2 Air at $199.

The new features RingConn lists for Gen 3 are vascular health trend insights, vibration alerts for health changes, inactivity and low battery, and a universal wireless charging case. RingConn states that Gen 3 gives vascular health trends rather than single blood pressure readings, and that the product is not a medical device and is not intended to diagnose or treat any condition.

The published specification is a titanium body with medical-grade epoxy and PVD coating, 2.3 mm thick and 2.5 to 3.5 grams. RingConn states battery life of 10 to 12 days with vibration on and 11 to 14 days with it off, 10 days of offline data storage and an IP68 and 10 ATM rating to 100 metres. Sensors are an optical heart rate sensor, a temperature sensor, a 3-axis accelerometer and a vibration motor.

Gen 3 works with iOS 17 or later and Android 10 or later and connects to Apple Health and Google Health Connect. Sizes run from 6 to 15, and RingConn notes that Gen 3 sizes differ from its earlier rings.

RingConn Gen 2 Air is the entry model in RingConn's range, listed at $199 on the US store. It shares the app and most tracking features of the $299 Gen 2, and RingConn's own model guide describes Gen 2 Air as the budget-friendly choice for essential daily tracking.

RingConn lists sleep stages, stress, heart rate, heart rate variability, blood oxygen, skin temperature, respiratory rate, steps, calories, workouts and menstrual cycle prediction, all without a subscription. The published specification is a stainless steel body with PVD coating and medical-grade epoxy, 6.8 mm wide, 2 mm thick and 2.5 to 4 grams. RingConn states 10 days of battery, about 90 minutes to charge, 5 to 7 days of offline storage and an IP68 rating to 100 metres. It works with iOS 17 or later and Android 10 or later.

Gen 2, at $299, uses titanium, weighs 2 to 3 grams and adds sleep apnea monitoring, which RingConn says reached 90.7% accuracy in its own figures. RingConn states 10 to 12 days of battery for Gen 2 and up to 150 days of use with its included charging case. Both models come in sizes 6 to 14, and RingConn sends a free sizing kit on request.

Galaxy Ring is Samsung's smart ring, sold on Samsung.com and designed to work with the Samsung Health app. Samsung positions it alongside the Galaxy Watch, with both feeding the same health dashboard.

Samsung's published specification lists three sensors: an accelerometer, an optical bio-signal (PPG) sensor and a skin temperature sensor. The ring is 7.0 mm wide and 2.6 mm thick, weighs 2.3 to 3.0 grams by size, uses a titanium frame and is rated 10 ATM and IP68. Samsung says the concave design helps limit scratches.

Battery life is up to 7 days on sizes 12 and 13 and up to 6 days on smaller sizes, according to the US product page, and Samsung states that the charging case extends use to up to 14 days away from an outlet. The buy page lists sizes 5 to 14, and a sizing kit ships before the ring.

Samsung requires an Android 11 or later phone with at least 1.5GB of memory, the Galaxy Wearable and Samsung Health apps and a Samsung account, so iPhone users cannot use the ring. Features include Energy Score, Wellness Tips, sleep tracking with snore detection, automatic walking and running detection and cycle tracking. Samsung states cycle tracking is not intended for contraception.

Circular is a Paris-based company, and Circular Ring 2 is its current ring, with a Circular Ring 3 waitlist open when checked. Circular describes Ring 2 as the only smart ring carrying both an ECG and a PPG sensor.

Circular states that the ring records a single-lead ECG in about 40 seconds and screens it for atrial fibrillation, with a PDF export. It also estimates blood pressure by timing the pulse wave between the ECG and PPG sensors, calibrated with three readings from an ordinary cuff at setup and one every 30 days. Circular describes these readings as wellness estimates for trend awareness and says they do not replace a validated cuff or a clinician.

The published specification is a titanium body with a PVD finish and hypoallergenic interior, 2.55 mm thick, 7.8 mm wide and 4 grams. Sensors are ECG, PPG, temperature and a 3-axis accelerometer. Circular states about 8 days of battery in power mode and 4 to 5 in performance mode, a 30-minute charge in the wireless case and an IP68 rating. Sizes run from US 6 to 14 in four finishes.

The app, with the Kira AI coach, runs on iOS and Android. Circular says core features need no subscription, and a small number of premium screens unlock with coins earned by wearing the ring.

The Helio Ring is Amazfit's smart ring, sold on its US store at $149.99. Amazfit, a Zepp Health brand best known for smartwatches, designs the ring to be worn alone or with an Amazfit watch, with data from both combined in the Zepp app.

The published sensors are a BioTracker PPG heart rate sensor, a temperature sensor and an electrodermal activity (EDA) sensor, plus a 3-axis accelerometer and 3-axis gyroscope. Amazfit states that the EDA sensor and heart rate variability are used to estimate stress and emotional state, and that the product is not a medical device and should not be used for diagnosis.

The outer ring is titanium alloy and the inner ring resin, 8 mm wide and 2.6 mm thick, weighing 3.65 to 3.82 grams. It is rated 10 ATM to 100 metres. Amazfit states battery life of up to 4 days on default settings and a charge of about 1 hour 40 minutes on the included wireless charger.

Sizes are limited to 8, 10 and 12, and Amazfit provides a paper-strip or string method with a circumference chart rather than a sizing kit. The ring supports Android 7.0 and later and iOS 14.0 and later. Amazfit includes Zepp Aura premium sleep features free, and its notes state that readiness insights rely on Zepp Aura.