The first difference showed up before day one. All four rings in this test start with a sizing kit. The Hume Band 2.0 came with one adjustable strap. I put it on, paired it with my phone and went to bed.

My fingers swell on hot days and after hard sessions on the rowing machine, and that's when a ring goes from forgettable to annoying. With the band I just loosened the strap a notch.

What it tracks is the bigger reason it won. Under the strap are 5 LEDs and 4 photodiodes tracking HRV, SpO₂, skin temperature, strain, recovery, activity and full sleep stages (light, deep, REM, awake). The rings cover a good chunk of that list. Hume pulled ahead on the layer it builds on top: Biological Age, Pace of Aging, Metabolic Capacity and Metabolic Momentum, plus blood pressure trends without a cuff. Ultrahuman has its own age score, and RingConn does blood pressure trends once you calibrate it against a cuff, but only Hume put all of it in one app.

About three weeks in, I had a rough stretch: two red-eye flights in one week and a run of five-hour nights. The band and the ring I had on that week both showed my sleep falling apart, and Hume's Metabolic Momentum score dipped right along with it.

So I moved dinner earlier, dropped the afternoon coffee and got to bed 45 minutes sooner. Within a week the line turned back up. Watching a number react to something I changed on purpose is what kept me opening the app every morning.

Blood pressure shows up as a trend across days, meaning which way it's heading over a week. If you want one exact number, you still need a cuff. I kept mine in the drawer and used Hume to watch the direction.

Battery was the other surprise. Most charges got me close to the full 14 days, and about 30 minutes on the charger brought it back to full. To be fair, the Ultrahuman Ring PRO goes longer (up to 15 days) and RingConn claims the same 14, so Hume ties RingConn, trails Ultrahuman by a day and clearly beats Oura and Samsung.

The app is free, and your core scores (Metabolic Capacity, Metabolic Momentum, Health Score and more) don't sit behind a paywall. Hume Premium, from $8.99 a month, adds AI coaching. I tried it. It's decent, but I'd start without it. The weekly report that lands every Monday turned into my favorite thing in the app.

Now the part ring fans will point out. A band is more visible than a ring. With a dress shirt, people notice it, and a ring is easier to forget you're wearing. Hume is rated IP68 to 1 meter for up to 2 hours, which covered every shower and pool session I did, but the rings are rated to 100 meters. If you spend a lot of time underwater, that gap matters. I don't, so it didn't.

At $249 it was also the cheapest device on my desk, a full $100 under the least expensive ring. Shipping is free, and Hume gives you 45 days to send it back if it isn't for you.

PROS

CONS

My Findings: After 90 days with the band on my wrist and the rings rotating on my other hand, Hume gave me the most I could act on: aging and metabolic scores, blood pressure trends, and sleep staging that held its own against the rings. It fit on day one, ran close to two weeks per charge, and never asked for a membership to show me my own numbers.

Bottom Line: Hume Band 2.0 shows you more of your biology for $249 than any ring here, and it's the one I'd buy. If you mostly want sleep data in the most discreet form, the rings below are good ones.

Of the four rings I wore, RingConn Gen 3 gave the Hume the hardest fight. Its best arguments are the two things that usually make me quit a wearable: charging and monthly fees.

There's no subscription. Once you've paid for the ring, RingConn doesn't ask for a monthly fee, which is how Hume handles its core data too.

Battery is a tie on paper. RingConn rates the Gen 3 for up to 14 days with vibration off, the same claim Hume makes for the band. Turn on vibration alerts and that drops to 10 to 12 days, and mine landed closer to 10. The charging case holds 150+ days of charge in total, so I barely thought about cables.

You'll order the free sizing kit before the ring itself, and Gen 3 sizes differ from standard ring sizes, so the size you already know won't help. The Hume strap fit my wrist the day it arrived.

Day to day, I liked wearing it. At 2.3 mm of titanium and 2.5 to 3.5 grams, it's far more discreet than a band, and people noticed the Hume on my wrist long before they spotted the ring. It's also rated to 100 m against the Hume's 1 meter for 2 hours, though both handled showers and laps in the pool.

My problems were with the data. Heart rate accuracy trails Oura and Samsung in independent testing, and recovery numbers are only as good as the heart data under them. The blood pressure trend insights need a cuff baseline before they start, while Hume's trends work without a cuff. I also missed Hume's Biological Age and Pace of Aging. And the ring only vibrates for health alerts, so it won't buzz for a text or an alarm.

At $349 ($369 for brushed finishes), it costs more than the Hume's $249 and tracks less of my biology. If you've settled on a ring and never want a membership, this is still the one I'd buy.

PROS

CONS

My Findings: RingConn Gen 3 is the ring I'd hand to anyone who refuses to pay a monthly fee. It matches the Hume on the 14-day battery claim and asks nothing of you after checkout. It lost points on the data: heart rate trails Oura and Samsung, and the blood pressure trends needed a cuff baseline before they started. At $349 against the Hume's $249, I got less biology for more money.

Bottom Line: The best ring if you never want a membership, and the closest any ring got to the band. For tracking your biology, Hume Band 2.0 still goes deeper and costs less at $249.

Oura Ring 5 has the best sleep app of any wearable I tested, the Hume included.

During my weeks with it, Oura's sleep screen was the first thing I checked each morning. The stage breakdowns are clean, and the Readiness score gave me a straight answer on whether to push a hard row or back off.

The hardware is just as good. Oura calls it the world's smallest smart ring, and at 2.28 mm thick and from 2 grams, it's the ring I kept forgetting I had on. It's titanium and rated to 100 m.

Like every ring here, it starts with a free sizing kit. Sizes run 6 to 13, with no half sizes. If you fall between two sizes, you pick one.

Then there's the membership, at $5.99 a month or $69.99 a year, on top of a ring that starts at $399 ($499 for Gold, Deep Rose, Stealth and Brushed Silver). Without it you only see three daily scores: Readiness, Activity and Sleep. Detailed sleep data, 24/7 heart rate, SpO₂ and stress all need the membership. That means most of the sleep detail I liked is a paid feature.

Hume sells a paid tier too: Premium, from $8.99 a month, adds AI coaching. Metabolic Capacity and the Health Score come with the free app.

Battery runs 6 to 9 days depending on ring size, against up to 14 on the Hume, and the charging case is sold separately. The battery can't be replaced. Workout tracking trails a watch, too, so on training days I leaned on the band's strain and recovery numbers.

If sleep is what you care about most and the membership doesn't bother you, Oura is the best ring for it.

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CONS

My Findings: Oura Ring 5 gave me the best sleep data of the four rings. Most of that detail sits behind the membership, though, so you're paying $399 up front and $69.99 a year to keep seeing it. Add a 6- to 9-day battery and a charging case you buy separately, and the band beat it easily on cost and on charging.

Bottom Line: Buy it if sleep is the main reason you want a wearable and $69.99 a year doesn't bother you. To track your biology without a required membership, Hume Band 2.0 is the better pick, and at $249 it's cheaper up front too.

I wore the Galaxy Ring alongside the Hume Band during my 90-day test, and on comfort the ring wins easily. It's titanium, 2.3 to 3.3 grams depending on size, and most days I forgot it was on my finger. The band is more visible on my wrist, and I won't pretend otherwise.

Getting the fit right takes an extra step. The ring comes in sizes 5 to 15, and Samsung mails you a free sizing kit before you order so you can try a sample on. With Hume I pulled the strap snug and that was it.

The big catch: it's Android only. You need Android 11 or newer, and it won't pair with an iPhone at all. Even some Android owners miss out, because Energy Score, Double Pinch and Find My Ring need a Galaxy phone. I tested it with a Galaxy phone, and in that setup it fits right in. The Energy Score was waiting for me every morning.

Battery is where the band pulled ahead. Samsung rates the ring at up to 7 days for sizes 12 and 13 and up to 6 days for smaller sizes, so I was dropping it in the charging case about twice as often as I charged Hume (up to 14 days). The case does come in the box, which beats Oura, where it's sold separately. The battery is sealed in and can't be replaced.

Sleep tracking was solid. It covers heart rate, HRV and skin temperature, plus SpO₂ during sleep if you toggle it on. There's no subscription today, though Samsung has said different terms may apply to future features, so I'd keep an eye on that.

Workouts are thinner. It only auto-detects walking and running, so my rowing machine sessions never showed up on their own. And on the biology side, which is what I cared about most here, the ring stays in sleep and recovery territory. Hume gave me Biological Age, Pace of Aging, Metabolic Capacity and blood pressure trends on top of sleep, for $249. The Galaxy Ring costs $399.99.

PROS

CONS

My Findings: If you already own a Galaxy phone, the Galaxy Ring is an easy ring to live with. It's light on the finger, and there's no subscription to pay today. iPhone owners can't use it at all, though, and Android owners without a Galaxy phone lose some features. Next to the band, I kept missing the biology metrics and the longer battery.

Bottom Line: A comfortable sleep ring for Galaxy phone owners, held back by a 6- to 7-day battery and no iPhone support. If tracking your biology is the goal, Hume Band 2.0 does more for $249 and works with both iPhone and Android.

The Ultrahuman Ring PRO is the one ring here that beats the Hume Band on battery. It's rated for up to 15 days per charge, and up to 45 days with the PRO charging case. Hume is rated for up to 14. If you hate charging things, the case alone makes this ring tempting.

It also has an age score of its own. Besides sleep, recovery, HRV, skin temperature, stress and movement, you get VO2 Max and an "Ultra Age" score. That was the closest any ring in this test came to what I get from Hume's Biological Age.

The trade-off is size. At 2.65 mm thick and 3.3 to 4.8 grams, it's the chunkiest ring I wore, and I felt it every time I gripped a barbell. Like every ring here, it starts with a free sizing kit. Sizes run 5 to 14, with no half sizes. The band's strap just adjusts, and I loosened it a notch after long runs.

The price is the other hurdle. It's $479 with the PRO charging case, the highest starting price on this list, and right now it's a pre-order with shipping from October 10th onwards. Mine came from the first batch that shipped back in June. Core data comes with no recurring subscription, which I like. Some extras do cost money, though. Ultrahuman sells paid add-ons called PowerPlugs, and Cardio Adaptability alone is $24 a year.

Activity tracking let me down too. It missed some of my walks completely, which stings at this price.

PROS

CONS

My Findings: The Ring PRO has the longest battery of anything I tested, Hume included, and its Ultra Age score came closest to Hume's Biological Age. I just couldn't get past the bulk on my finger, and $479 plus paid PowerPlugs is more than I'd want to spend on a ring I notice all day.

Bottom Line: Worth the wait if battery life is your top priority and a thicker ring doesn't bother you. If you want to track your biology, Hume Band 2.0 goes deeper and costs $230 less.

Abigail F.

Love it

"I love my Hume Band 2.0! People around me are trading their Apple Watches for Whoop, and I'm staying loyal to my Hume Band. I love that they keep updating and improving it. The insights are next level, and the strap is so much more comfortable."

Hailey S.  

10/10 Would recommend

"I used to wear an Oura Ring, but after a while I found it pretty unhelpful. My husband bought the Hume Band 2.0 and swears by it, so I gave it a go, and I've been obsessed ever since. The detail in the insights is so, so helpful for understanding how my habits affect my overall health, and I love that my biological age is 28! (I'm 39.) Being able to see when I need to recover, and how my sleep helps my metabolic capacity, was pretty cool."

Christopher A.

Excellent Device

"I've had my Hume Band 2.0 for almost a year. Their Prof.AI has helped me sleep better and recover better, and it keeps suggesting more things I can do for my overall fitness! It's a great tool for an athlete of any age and any skill level. I also love that I can see how my habits affect my pace of aging."

Natalie B.  

Hume Band is now part of my life

"I was a loyal Whoop user, but I tried the Hume 2.0 because you don't have to pay for a subscription, and boy was I blown away! There are so many more helpful insights here about living healthier. The app is pretty easy once you get the hang of it, and now I look forward to my weekly health report every Monday."