Ultrahuman vs Oura: Which Smart Ring Should UK Buyers Choose?

For most UK buyers, the Ultrahuman Ring AIR is the better buy on cost and the Oura rings are better on battery, polish and proof. The Ring AIR is £199 on Amazon UK with no membership, so it costs £180 less than an Oura Ring 4 and £340 less than an Oura Ring 5 over two years. Pick Oura if you want a ring that lasts a week between charges and has independent sleep lab research behind it; pick Ultrahuman if you want the same core sleep and recovery data and refuse to pay monthly for it.

We compare the Ring AIR with Oura's two current rings, the Ring 4 (£239 on Amazon UK) and the Ring 5 (£399), and explain what the long-running patent fight between the two companies means for buyers in the UK.

Ring AIR vs Ring 4 vs Ring 5 at a glance

	Ultrahuman Ring AIR	Oura Ring 4	Oura Ring 5
Amazon UK price	£199	£239	£399
Subscription	None for core features	£5.99/month or £69.99/year	£5.99/month or £69.99/year
Claimed battery	4 to 6 days	5 to 8 days	6 to 9 days
Full charge	180 minutes (Ultrahuman spec sheet)	20 to 80 minutes	About 80 minutes
Width and thickness	8.1mm, 2.45mm to 2.8mm	7.9mm, 2.88mm	6.09mm, 2.28mm
Weight	2.4g to 3.6g	3.3g to 5.2g	From about 2g
Sizes	5 to 14	4 to 15	6 to 13
Water resistance	Up to 100m	Up to 100m	Waterproof to 100m, IP68
Phones	iOS and Android	iOS and Android	iOS and Android

The Ring AIR sits between the two Ouras physically. It's lighter and a touch thinner than the Ring 4, but the Ring 5 is slimmer and narrower than both.

Cost: no subscription vs Oura Membership

This is the headline difference. Ultrahuman includes sleep, recovery, heart rate, HRV, skin temperature, stress and activity tracking in the price of the ring, with no time limit. Oura includes the first month of membership, then Oura's membership page lists UK pricing at £5.99 a month or £69.99 a year. Without it, most of what you'd buy an Oura for is locked.

Here's what each ring costs to own, using Amazon UK prices and Oura's annual plan.

Ring	Upfront	Membership over 2 years	2-year total	3-year total
Ultrahuman Ring AIR	£199	£0	£199	£199
Oura Ring 4	£239	£139.98	about £379	about £449
Oura Ring 5	£399	£139.98	about £539	about £609

Paying Oura monthly comes to about £138 over two years once the free month is taken off, so the totals hardly move. The gap with the Ring AIR grows by £70 a year for as long as you keep the ring. By year three, an Oura Ring 5 owner has spent three times as much as a Ring AIR owner.

Ultrahuman's asterisk: PowerPlugs

"No subscription" isn't quite the whole story. Ultrahuman runs an add-on store called PowerPlugs. Most are free, including Smart Alarm, Caffeine Window, Shift Work, Cycle and Ovulation, and Pregnancy Insights. When we checked the UK store for our Ultrahuman Ring AIR review, three were paid: AFib Detection at £4.90 a month, Cycle and Ovulation Pro at £2.99 a month and Tesla Sync at £6.90 a month. There's also an optional Ultrahuman Max plan at £9.99 a month or £99.99 a year, which bundles PowerPlugs with damage and loss cover.

None of that is needed to use the ring fully. But if the heart rhythm check is the reason you want a ring, budget for it, and note that AFib Detection alone would cost about £118 over two years.

Check Ultrahuman Ring AIR prices and sizes on Amazon£199 at the time of writing

Battery and charging

Oura wins here. Ultrahuman quotes 4 to 6 days for the Ring AIR from its 24mAh cell, and owners commonly report landing nearer the bottom of that range. Its UK spec sheet also lists 180 minutes for a full charge, which is slow for a ring that already needs charging twice a week.

Oura quotes 5 to 8 days for the Ring 4 and 6 to 9 days for the Ring 5, with the smallest sizes at the lower end. A Ring 4 charges in 20 to 80 minutes depending on how flat it is. In practice that's one charge a week with an Oura against two with the Ring AIR, and every extra charge is another chance to leave the ring on the dock at bedtime and lose a night's data.

If battery is your main worry with Ultrahuman, its newer Ring PRO claims up to 15 days and was listed at £429 on Ultrahuman's UK store when we last checked. That's more than an Oura Ring 5 upfront, though still cheaper over two years once Oura's membership is counted.

Sizing and comfort

Ultrahuman lists the Ring AIR at 2.4g to 3.6g, 8.1mm wide and 2.45mm to 2.8mm thick. That makes it lighter and slightly thinner than the Oura Ring 4 (3.3g to 5.2g, 7.9mm wide, 2.88mm thick), but bulkier than the Ring 5 (from about 2g, 6.09mm wide, 2.28mm thick). On a slim finger or beside a wedding band, the Ring 5 is noticeably less obvious than either.

Size ranges differ too. The Ring AIR comes in sizes 5 to 14 with no half sizes, the Ring 4 in 4 to 15 and the Ring 5 in 6 to 13. All three brands' sizes differ from jewellery sizes, so the order of play is the same whichever you choose: get the right sizing kit, wear the dummy ring on your chosen finger for a full day and night, then buy. The Amazon listings we link are each a single size and finish (Ring AIR Bionic Gold size 7, Ring 4 gold size 9, Ring 5 silver size 10), so select yours on the page.

One durability note: the Ring AIR's titanium shell has a tungsten carbide carbon coating, and owners of coated rings often report hairline scratches within weeks, especially on darker finishes and around gym equipment. Oura's rings are titanium inside and out. Neither type enjoys a knurled barbell, so lifters tend to move rings to the other hand or take them off for heavy sets.

Features and app

The two apps cover the same core ground. Each morning you get a sleep score with light, deep and REM breakdowns and a recovery score (Oura calls it Readiness) built from resting heart rate, HRV and temperature. Both track activity, stress and menstrual cycles.

Oura's app is more established. It has years of refinement behind its scores, Oura Advisor answers questions about your own data in plain language, and the Ring 5's Amazon listing says it integrates with 40+ apps including Natural Cycles, Flo and Strava. If you rely on other health apps, Oura connects to more of them.

Ultrahuman's angle is the PowerPlugs store. The free ones add genuinely useful context, such as a caffeine cut-off time based on your sleep, a shift work mode and a new parent mode, and the app tracks sleep debt across nights. It's more of a toolkit, where Oura feels more finished. Which you prefer comes down to taste.

Accuracy: Oura has the evidence

This is Oura's biggest advantage. In a 2024 lab study of 35 healthy adults, the Oura Ring Gen3 showed no significant difference from polysomnography for wake, light, deep or REM sleep, while the Fitbit and Apple Watch tested alongside it did differ on some stages. A 2025 meta-analysis of six studies and 388 participants found no significant difference between Oura and reference sleep measures for total sleep time, sleep efficiency or any sleep stage.

We couldn't find an equivalent independent sleep lab study of the Ultrahuman Ring AIR in PubMed Central. That doesn't mean it's inaccurate. It means that if you want proof rather than a company claim, only Oura currently offers it. For most people tracking weekly trends in sleep and HRV, both rings will show the same direction of travel, and the trend is what helps you plan training and rest. Our guide to sleep and muscle recovery explains why that matters.

The patent fight, and what it means in the UK

Oura and Ultrahuman have been in legal disputes since 2023. The big result came in 2025: the US International Trade Commission found that Ultrahuman's rings infringed an Oura patent, and after the presidential review period ended on 21 October 2025, the order took effect and stopped Ultrahuman importing and selling those rings in the United States. Ultrahuman then brought out the redesigned Ring PRO, and in October 2026 Oura filed a fresh patent suit in a Texas federal court seeking damages and an injunction against Ring PRO sales. Ultrahuman has said it will defend the case and that no court order affects the Ring PRO.

All of that is US-only. The ITC order covers imports into the United States, and the new lawsuit was filed in a US court. Neither stops UK sales, and the Ring AIR was on sale on Amazon UK and Ultrahuman's UK store when we checked in November 2026. The only reasonable worry for UK buyers is long-term: a company fighting legal battles in its biggest market has less money for everything else. We've seen nothing to suggest UK owners have lost any app features.

Which should you buy?

Ultrahuman Ring AIR is the pick if cost matters most. At £199 with no membership, it gives you the core sleep, HRV, temperature and recovery data for a fraction of an Oura's two-year cost. Accept twice-weekly charging and thinner published evidence.

Oura Ring 4 is the middle ground. It costs £40 more upfront, then £69.99 a year, but you get a longer battery and Oura's well-researched sleep tracking. Read our Oura Ring 4 review for the detail.

Oura Ring 5 is the most comfortable ring here and the best-evidenced, and it's the most expensive by a wide margin at about £539 over two years. Our Oura Ring 5 review covers whether it's worth it.

Check Oura Ring 4 prices and sizes on Amazon£239 at the time of writing Check Oura Ring 5 prices and sizes on Amazon£399 at the time of writing

Not sold on either? The RingConn Gen 3 also skips the subscription and claims 11 to 14 days of battery for £309, the RingConn Gen 2 Air costs £179, and Android owners can look at the Samsung Galaxy Ring. Browse more sleep and recovery kit in our recovery section.

Recommended reads

• Ultrahuman Ring AIR review
• Oura Ring 5 review
• RingConn vs Oura
• WHOOP vs Oura: which recovery tracker should you buy?
• Sleep and muscle recovery