3 Alternatives to the Oura Ring 4 Size 9: Better Fit, Different Features, Same Price Range

If you want the closest possible match, the OURA Ring 4 - Silver - Size 8 is essentially the same product as the Size 9 version: same £349 price, same 4.2★ rating, same smart ring format, sleep tracking, heart rate monitoring and up to 8 days of battery life. The main difference is fit. That matters more than people think: a ring that’s even slightly loose can reduce sensor contact and make overnight heart-rate and sleep-stage data less reliable. Choose this if Size 9 is unavailable but your sizing kit suggests Size 8 is a secure fit. What’s better: same core features, same price, likely easier to buy if Size 9 is out of stock. What’s worse: no upgrade in features, so you’re only changing size.

The Oura Ring 4 - Silver - Size 7 - Size Before You Buy is another close alternative, but it’s only a sensible option if your finger is genuinely smaller. Like the Size 9 model, it’s £349 and rated 4.2★, and it exists mainly to help you confirm fit before committing. For sleep tracking, fit accuracy is crucial because optical sensors need stable skin contact to estimate heart rate, sleep duration and overnight recovery trends. What’s better: useful if Size 9 feels too loose or you’re between sizes and want to test before buying. What’s worse: it’s not a better ring, just a different size, so only choose it if the sizing process points you there.

The Withings ScanWatch Nova is the real alternative here if you want something broader than a ring. At £464.89, it’s more expensive than the Oura and uses a hybrid smartwatch design rather than a discreet ring. In return, you get ECG, SpO2, temperature monitoring, sleep tracking, respiratory health and cycle tracking, plus a much longer 30-day battery life. That makes it attractive if you want fewer charging interruptions and more health metrics in one device. However, it’s not as subtle as a ring, and sleep tracking accuracy on wrist-worn devices can be more variable than users expect, especially if the watch is worn loosely or during restless nights. What’s better: far longer battery life, more health features, and a more traditional wearable form factor. What’s worse: higher price, bulkier on the wrist, and not as minimal as Oura.

In short, the two other Oura sizes are best if your main problem is fit and availability, while the Withings is the better pick if you want a smartwatch-style device with more health monitoring and you don’t mind paying extra. If your priority is simple, wearable sleep tracking with a premium finish, Oura still makes sense. If you want more data for the money, the ScanWatch Nova is the stronger all-rounder.