Oura Ring 4 Review: I Wore This Smart Ring for 90 Days — Here's My Honest Take

At a Glance: Oura Ring 4

Feature Details

Product: Oura Ring 4

Price: $349 – $499 (depending on finish)

Subscription: $5.99/month or $69.99/year (required for full features)

Battery Life: 7–8 days (I got 7.5 days consistently)

Sizes: 4–15 (sizing kit included)

Best For: Sleep tracking, recovery monitoring, women's health

Water Resistance: 328 feet (swim-proof)

My Rating: 9.2/10

Check current price on Amazon: Click here to see Oura Ring 4 on Amazon

Why I Decided to Test the Oura Ring 4

Look, I'll be straight with you. I've never been a "wearables guy." Apple Watches felt bulky on my wrist, especially when I tried sleeping with them. And honestly, who wants notifications buzzing at 2 AM?

But last December, my buddy in Austin showed me his Oura Ring 3. The guy knew exactly when he was getting sick three days before symptoms showed up. That got me curious.

When Oura dropped the Ring 4 in October 2024, I decided to take the plunge. I've now worn this thing for 90 consecutive days – through business trips to New York, gym sessions in LA, and lazy weekends in Chicago. Here's what actually went down.

First Impressions: Unboxing and Sizing

The process starts with a sizing kit. Smart move by Oura – this ring needs to fit snug.

Here's what surprised me: Oura recommends wearing the sizer on your index finger for 24 hours. I thought that was overkill until I tried it. My fingers actually swell and shrink throughout the day (something about salt intake and hydration I never noticed before).

The actual ring arrived five days later. Picking it up, the first thing I noticed was the weight – or lack of it. We're talking 4–6 grams depending on size. My wedding band feels heavier.

The recessed sensors are the real deal. On the Gen 3, those bumps left marks on my finger after sleeping. On the 4? I literally forgot I was wearing it day three.

Smart Sensing Technology: Not Just Marketing Fluff

Oura keeps talking about this "Smart Sensing" thing. Here's what it actually means after three months of use:

The ring has 18 different signal pathways it can use to read your data. If the ring rotates on your finger (which happens constantly), it automatically finds the best route to your arteries.

Real-world example: I'm a side sleeper. My left hand gets squished under my pillow. With my friend's Gen 3, that meant data gaps. With my Ring 4? Not a single gap in 90 days. The ring just... adapts.

I tested accuracy against my brother's medical-grade ECG (he's a nurse). Over a weekend, we compared resting heart rate readings:

• Oura Ring 4: 62 BPM average

• Medical ECG: 61.8 BPM average

That's close enough for me.

Sleep Tracking: Where This Ring Earns Its Keep

This is the main event, folks. After 90 nights, I can confidently say the Oura Ring 4 is the most accurate sleep tracker I've ever used.

The data it gives you every morning:

• Sleep score (0–100)

• Time in bed vs. actual sleep time

• REM, deep, and light sleep breakdown

• Resting heart rate during sleep

• HRV (heart rate variability)

• Respiratory rate

• Average blood oxygen

• Skin temperature deviation

But here's what actually matters: The insights.

Around day 40, I noticed my sleep score dropping from 85 to 72 consistently on Wednesdays. Couldn't figure it out. Checked the tags feature – turns out I was having bourbon with clients on Tuesday nights. Two glasses minimum. The data didn't lie: alcohol trashes my deep sleep by about 35%.

I cut it out. Sleep scores went back up. That's $350 worth of information right there.

One funny thing: The ring thought I was asleep during my kid's 3 AM feeding sessions while I was actually wide awake in a glider chair. Every wearable does this, apparently. Something about being still with elevated heart rate confuses them.

Readiness Score: Should You Hit the Gym or Hit the Couch?

Every morning, you get a readiness score from 0–100. This combines your sleep data, HRV, resting heart rate, and temperature trends from the last 24 hours.

How I used it:

• Score 85+: PR territory. I hit deadlifts and actually set a new personal best (435 lbs – humble brag).

• Score 70–84: Solid day for moderate training.

• Score below 70: Active recovery. Walk, stretch, maybe some mobility work.

The cool part? It was right about 90% of the time. There were days I felt ready but the ring said chill. I listened, avoided what would've been a garbage workout, and felt better the next day.

Activity Tracking: The Weak Spot (Let's Be Real)

I'm not gonna sugarcoat this – if you're a hardcore athlete tracking every rep and mile split, this ring isn't your primary tool.

What it does well:

• Automatically detects walks and runs (within 2–3 minutes)

• Step counting is accurate (compared to manual counting around my block)

• Heart rate during steady-state cardio matches my chest strap within 2–3 BPM

What it doesn't do well:

• Weightlifting detection? Nope. Had to manually start workouts.

• GPS is phone-dependent. Leave your phone behind, no GPS data.

• No real-time pace or heart rate display (obviously – no screen)

My workaround: I use the Oura for 24/7 health tracking and keep my phone in my pocket for GPS during outdoor runs. Works fine for a regular guy trying to stay fit. If you're training for Boston Marathon, get a Garmin.

Women's Health Features: I Asked My Sister to Test This

Full disclosure: I'm a dude. I can't personally test cycle tracking. So I handed the ring to my sister for 30 days. She's been using an Apple Watch for two years.

Her words, not mine:

"The temperature tracking is legit. My Apple Watch never caught the 0.2-degree rise before my period. Oura caught it every single time. Period predictions were within 12 hours of actual start."

The Fertile Window feature estimates ovulation based on temperature and heart rate trends. She said it matched her ovulation test strips 28 out of 30 days.

If you're trying to conceive or avoid pregnancy naturally, this is worth the subscription alone for many women.

Battery Life: Beats Every Smartwatch

Oura claims 8 days. I got:

• 7.5 days with normal use (sleep tracking + 2–3 workouts)

• 6 days with blood oxygen sensing enabled nightly

• Full charge time: 78 minutes from dead

Compare that to my friend's Apple Watch Ultra – dead in 36 hours. Or Samsung Galaxy Watch – dead in 48.

The trade-off? No screen. But that's the point. I charge mine Sunday evenings while watching football. Set it and forget it.

Downside: You need the proprietary charger. Lose it, you're paying $30 for a replacement. Pack it for vacations.

Design and Comfort: Finally Feels Like Jewelry

The Gen 3 looked like a gadget. The Gen 4 looks like a ring.

Finishes available:

• $349: Silver, Black

• $399: Brushed Silver, Stealth (matte dark gray)

• $499: Gold, Rose Gold

• $499+: Ceramic finishes (Cloud, Midnight, Petal, Tide)

I went with Stealth. Three months later, minimal scratching. My buddy's gold finish shows more micro-scratches, but nothing noticeable from arm's length.

Comfort notes:

• Can't feel it during sleep

• No issues with barbells or dumbbells

• My wife wears it on her middle finger (size 6) and forgets it's there

• The recessed sensors are game-changing – no more green lights flashing on your finger

The App Experience: Redesigned and Actually Useful

Oura completely overhauled the app for the Ring 4 launch. Three main tabs:

Today: Your scores at a glance. Readiness, sleep, activity, heart rate. Clean layout.

Vitals: All your biometric data in one scroll. Resting heart rate trends, HRV graphs, temperature charts. This is where you nerd out.

My Health: Long-term trends. Cardiovascular age, cardio capacity, stress resilience. Shows data over weeks and months.

The app loads data in about 5 seconds. The Gen 3 app took 15–20 seconds. Huge improvement.

New feature worth mentioning: The AI advisor (beta). Ask questions like "Why was my sleep bad Tuesday?" and it analyzes your tags and data. Not perfect yet, but promising.

The Subscription Situation: Let's Talk Money

This is the elephant in the room. Oura charges $5.99/month or $69.99/year after the first month free.

What you lose without subscription:

• Detailed sleep analysis (stages, HRV, respiratory rate)

• Readiness score

• Cycle insights

• Long-term trends

• Most of the value, honestly

Is it worth it?

I hate subscriptions as much as anyone. But here's my take: you're paying $350 for the hardware and $72/year for the ongoing software development. Oura releases new features every few months (cardiovascular age, stress resilience, fertile window all dropped in the last year).

Compare to Whoop: $30/month with no hardware cost. Over three years:

• Oura: $350 + $216 = $566

• Whoop: $1,080

Oura is cheaper long-term.

Still, I'd love a lifetime option. Samsung Galaxy Ring has no subscription. Trade-off is Samsung's app isn't as polished.

Pros and Cons: The Honest List

What I Loved ✅

• Comfortable enough to forget – Recessed sensors are a massive upgrade

• Sleep tracking accuracy – Best I've tested, period

• Battery life – 7+ days beats every smartwatch

• Temperature sensing – Caught early illness twice (once before symptoms)

• Cycle tracking – My sister confirmed it's remarkably accurate

• Build quality – Titanium feels premium

What I Didn't Love ❌

• Subscription required – Would prefer a one-time purchase option

• Workout tracking limited – Auto-detection misses many exercises

• Proprietary charger – Lose it, you're stuck

• Pricey – $349 base plus subscription adds up

• GPS phone-dependent – Can't leave phone behind for runs

• Gold finish scratches easier – Go with silver or stealth if you're rough on jewelry

Oura Ring 4 vs. Competitors

vs. Samsung Galaxy Ring ($399)

• Samsung wins: No subscription, better integration with Galaxy phones

• Oura wins: Better app, more accurate sleep tracking, more size options

• Verdict: Galaxy users might prefer Samsung; everyone else, stick with Oura

vs. RingConn Gen 2 ($299)

• RingConn wins: Cheaper, no subscription

• Oura wins: Better accuracy, more features, polished app

• Verdict: RingConn is budget-friendly, but you get what you pay for

vs. Apple Watch Series 10 ($399)

• Apple wins: Screen, GPS, calls, apps, workout tracking

• Oura wins: Battery life, comfort for sleep, no distractions

• Verdict: Not really competitors. Many people (including me) wear both.

Who Should Buy the Oura Ring 4?

Perfect for you if:

• You care deeply about sleep quality

• You want to understand your body's recovery

• You're tracking menstrual cycles or trying to conceive

• You hate wearing watches to bed

• You're a data nerd who loves trends and insights

Not for you if:

• You're a competitive athlete needing detailed workout stats

• You refuse to pay monthly subscriptions

• You want on-wrist notifications and screens

• You're on a tight budget (look at RingConn)

Where to Buy Oura Ring 4 (Affiliate Link)

Check current price on Amazon: Click here to see Oura Ring 4 on Amazon

Available directly from Oura: Official Website (they offer 30-day returns)

Sizing kit process: Amazon sends the sizer first. Confirm size, they ship the ring. Takes about 5-7 days total.

Note: Prices vary by finish. Silver and Black are $349. Gold and Rose Gold are $499. Ceramic finishes start at $499.

Frequently Asked Questions

1. Is the Oura Ring 4 accurate for heart rate?

Yes. I tested against medical-grade ECG and saw 99% agreement. Resting heart rate readings were within 0.2–0.5 BPM consistently. During workouts, it matches chest straps within 2–3 BPM for steady-state cardio.

2. Can I wear Oura Ring 4 in the shower?

Absolutely. It's water-resistant to 328 feet. I've showered, swum, and done hot yoga with mine. No issues. Just dry it afterward like any ring.

3. Do I really need the subscription?

To get full value, yes. Without subscription, you see daily scores but no detailed sleep stages, HRV, readiness, or long-term trends. It's like buying a sports car and leaving it in the garage.

4. How long does shipping take to the USA?

Amazon Prime: 2 days for sizer, 2 days for ring after confirmation. Direct from Oura: 5–7 business days total. I'd recommend Amazon for faster delivery.

5. Does Oura Ring 4 work with iPhone and Android?

Yes. Works with both. Setup is identical. App features are the same across platforms. Android users get Labs features now too (previously iOS exclusive).

My Final Verdict After 90 Days

The Oura Ring 4 isn't cheap. With subscription, you're looking at about $400–$550 over two years depending on finish. But here's the thing – it actually changed how I think about my health.

I sleep better because I see what hurts my sleep. I train smarter because readiness scores prevent overtraining. I caught a cold before it hit because my temperature spiked 0.3 degrees two days before symptoms.

Is it perfect? No. Workout tracking needs work. The subscription stings. Gold scratches.

Is it the best smart ring available? Absolutely. By a significant margin.

If you're ready to understand your body at a deeper level, grab one. If you're happy guessing about your sleep and recovery, save your money.

My rating: 9.2/10