Oura Ring 4 Ceramic vs Oura Ring 5

These two could cost the same $399 on Oura’s US store in September 2026, with Ceramic on sale, but they’re a generation apart. Ceramic is Ring 4 with a zirconia exterior, and Ring 5, announced 28 May 2026, is Oura’s newer and smaller titanium ring. Price won’t separate them; your finger size and how much ring you want to wear will.

Ceramic and Ring 5 in numbers

Spec	Oura Ring 4 Ceramic	Oura Ring 5
Generation	Ring 4, zirconia version	Announced 28 May 2026
US price (19 September 2026)	$399 on sale, $499 list (Midnight, Cloud)	From $399 (Silver, Black); $499 Gold, Deep Rose, Stealth, Brushed Silver
Sizes	4–15, Ring 4 sizing kit	6–13, Ring 5 sizing kit
Width	7.9 mm	6.09 mm
Thickness	3.51 mm	2.28 mm
Sensor dome	Recessed, 0.3 mm	0.7 mm
Weight	5.1–8.1 g by size	From 2 g by size
Shell	Zirconia ceramic outside, titanium inside	Titanium inside and out, superhard PVD
Battery	Typically 5–8 days	Typically 6–9 days
Charging time	Typically 20–80 minutes	About 80 minutes
Data stored on the ring	Up to 7 days	Up to 3 days
In the box	Size-specific charger, USB-C cable, polishing pad	Size-specific charger, USB-C cable; charging case sold separately
Water	100 m (328 ft)	100 m (328 ft) and IP68
Finishes	Midnight, Cloud; Tide and Petal not priced that day	Black, Silver, Stealth, Brushed Silver, Gold, Deep Rose
Latest firmware	2.12.0 (17 June 2026), on the Ring 4 list	2.1.3 (10 June 2026)
Membership	$5.99 a month or $69.99 a year	Same
Phones	iOS 16 or later, or Android 11 or later; Bluetooth 5.0	Same

Sizes 4, 5, 14 and 15 are Ceramic’s

Ring 5 comes in sizes 6 to 13, on its own white sizing kit, and Oura says its sizing is slightly different from Ring 4. Ceramic uses the Ring 4 kit and runs from 4 to 15.

If you wear a 4, 5, 14 or 15, Ceramic is the one of these two that fits. Anywhere from 6 to 13, size doesn’t force the choice, and the rest comes down to the shell, the battery and storage.

Ring 5 is smaller; Ceramic sits flatter inside

Ring 5 is 6.09 millimeters wide and 2.28 thick; Ceramic is 7.9 and 3.51. That makes Ring 5 almost two millimeters narrower and more than a millimeter thinner. Ceramic weighs 5.1 to 8.1 grams depending on size, and Ring 5 starts at 2 grams.

Oura says Ring 5 has 40 percent less volume than Ring 4, but that compares it with the titanium Ring 4, which weighs 3.3 to 5.2 grams. Ceramic is thicker and heavier than that again, so the gap to Ring 5 is wider.

The inside works the other way. Ceramic’s sensors sit in recessed domes 0.3 millimeters high, while Ring 5’s sensor dome stands 0.7 millimeters, so Ceramic is the flatter of the two against your skin.

Ceramic is zirconia over a titanium interior, and its box adds a polishing pad. Ring 5 is titanium inside and out with superhard PVD. Oura doesn’t require a Proposition 65 warning on Ceramic, though it does on titanium Ring 4 and Gen3; that’s a label about materials, not a health feature.

More battery on Ring 5, more storage on Ceramic

Ring 5 typically lasts 6 to 9 days and Ceramic 5 to 8, and Oura says size, settings, activity and the battery’s age all change that. Ceramic charges in 20 to 80 minutes, depending on where it starts; Ring 5 takes about 80.

Storage goes the other way. Ceramic holds up to seven days of data on the ring and Ring 5 up to three, so a week away from your phone fits on Ceramic and runs past what Ring 5 can hold.

Both come with a size-specific charger and a USB-C cable. Ring 5 also has an optional charging case, sold separately, which Oura says holds up to a month of charge and gives the ring a full day’s battery in about 10 minutes. It’s a Ring 5 accessory.

Same app, same membership

Ceramic uses Ring 4’s Smart Sensing, with red and infrared light for blood oxygen and green and infrared for heart rate, plus a temperature sensor and an accelerometer. Ring 5 lists two triple LEDs, two photodetectors, a temperature sensor and an accelerometer, and Oura cites 12 signal pathways for it. Either way, what you see in the app depends on the membership.

Membership covers Gen3 and newer rings, which includes both. It costs $5.99 a month or $69.99 a year in the US, with the first month free for new members, and it belongs to your account, so a membership you already pay moves to either ring. Stress, Heart Health and Women’s Health need it on both, and newer tools such as Health Radar come to every ring from Gen3 on, not just Ring 5. If you won’t pay after the free month, skip both.

Both work with an iPhone on iOS 16 or later or an Android phone on Android 11 or later, as long as the phone has Bluetooth 5.0. Oura says neither ring is a medical device.

Water

Both are rated water resistant to 100 meters (328 feet); only Ring 5 adds an IP68 rating. Oura’s model pages allow saunas and water sports but rule out diving, while its general advice allows showering, swimming and recreational diving or snorkeling, rules out scuba, and says not to stay underwater more than 12 hours. Scuba is out either way.

What they cost

On Oura’s US store on 19 September 2026, Ceramic in Midnight and Cloud was $399 on sale against a $499 list price, and Tide and Petal had pages but no price; Oura says finishes and sizes depend on inventory. Ring 5 started at $399 in Silver and Black, and its other four finishes were $499. Membership comes on top of either after the free month.

The store flipped between dollars and euros that day: Ceramic’s own page showed €429 and €549, one store check showed it at €300.30 and €429, and Ring 5 showed from €429 on some checks and from $399 on others. Treat the dollar prices as a guide and check the US store before you buy.