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

Oura Ring 4 Review: The Short Version

If you're short on time, here's the deal: the Oura Ring 4 is currently the best smart ring you can buy in the US market. After wearing it for 90 days straight — sleeping, showering, working out, even doing dishes — I can confidently say it delivers on its promises. But it's not for everyone.

Quick Facts

Product: Oura Ring 4

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

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

Subscription: $5.99/month required for full features

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

Not For: Serious athletes needing real-time workout data

Where to Buy: Check price on Amazon or Oura's official site

How I Tested the Oura Ring 4

I've worn the Oura Ring Gen 3 for two years before upgrading to the Ring 4. For this review, I wore the Ring 4 on my right index finger for 90 consecutive days — only taking it off to charge every 7-8 days. I tracked:

• Sleep every single night (90 nights of data)

• 45+ workouts including running, weightlifting, yoga, and hiking

• One sick day (caught a cold in week 3 — interesting data!)

• One cross-country flight from NYC to LA to test travel recovery

I compared data against my Apple Watch Series 9 and my wife's Garmin Venu. I also interviewed three other Oura Ring 4 users in my local running group in Austin, Texas to get their takes.

What's New in the Oura Ring 4? (From Someone Who Wore Gen 3)

I'll be real with you — I almost didn't upgrade. But after three months with the Ring 4, here's what actually matters:

The Sensors Are Finally Comfortable

The Gen 3 had these annoying bumps inside that left marks on my finger. The Ring 4's sensors are recessed — basically flush with the ring interior. I literally forget I'm wearing it. At the gym, gripping dumbbells doesn't leave indentations anymore. Huge win.

Smart Sensing Actually Works

Oura calls this "Smart Sensing" — basically the ring figures out the best path to read your heart rate based on your finger's unique anatomy. Sounds like marketing speak, but I noticed:

• Fewer "gaps" in heart rate data during sleep

• My resting heart rate readings matched my Apple Watch within 1-2 BPM consistently

• During workouts, it kept up better than Gen 3 (though still not watch-level accurate)

Battery Life: 8 Days Claim vs Reality

Oura claims 8 days. I got 7.5 days consistently with all features on (including blood oxygen sensing). When battery hits 20%, the app nags you — in a helpful way. Charging takes about 80 minutes from dead.

One annoyance: you need their proprietary charger. Forget it on a trip? You're screwed. I keep a charger in my work bag and one at home.

Sleep Tracking: Where This Ring Earns Its Keep

I'm a terrible sleeper. Three kids, stressful job, constant travel. The Oura Ring 4 has genuinely helped me understand why I feel like garbage some mornings.

The Sleep Score Actually Means Something

Every morning you get a score from 0-100. Under 70 means "oof, take it easy." 70-84 is solid. 85+ means you crushed it.

My average over 90 days: 76. Not great, but honest.

What I learned:

• Alcohol destroys my sleep. One IPA drops my HRV by 15 points and adds 30 minutes of wake time. The data doesn't lie.

• Eating after 8pm keeps my heart rate elevated 2 hours into sleep.

• The 15 minutes before bed matter — phone scrolling = worse sleep. Reading = better sleep.

The ring tracks:

• Total sleep time

• REM, deep, light stages

• Resting heart rate

• HRV (heart rate variability)

• Respiratory rate

• Blood oxygen (SpO2)

Is it accurate? Compared to my Apple Watch, the Oura was more consistent. The Apple Watch sometimes thought I was awake when I was just lying still. Oura rarely messed that up.

Activity Tracking: The Honest Truth

Here's where I need to be straight with you: the Oura Ring 4 is not a fitness watch.

What It Does Well

• Step counting — accurate within 5% of my Apple Watch

• Automatic walk detection — works every time

• Running GPS — if you carry your phone, it maps routes decently

• Daily movement — reminds you to move without being annoying

What It Does Poorly

• Weightlifting — doesn't detect sets or reps automatically

• Yoga — rarely logs it unless I manually start it

• Real-time heart rate zones — you can't glance at your finger during a sprint

Here's my rule: If you're training for a marathon or competing in CrossFit, buy a Garmin or Apple Watch. If you want to understand your overall health and recovery, get the Oura.

I still wear my Apple Watch for runs. But I wear Oura 24/7 for everything else.

Readiness Score: Should You Push or Rest?

This is Oura's secret sauce. Every morning, the ring tells you if your body is ready to crush it or needs a chill day.

The Readiness Score combines:

• Sleep quality

• HRV trend

• Resting heart rate

• Body temperature

• Previous day's activity

Real example: Three weeks in, I felt fine but my readiness score was 68 (low for me). HRV was down 12 points from baseline. Temperature slightly elevated. I ignored it and did a heavy leg day. Felt terrible. Next day, full-blown cold.

The ring knew before I did.

Now I listen. When readiness is low, I do mobility work or easy walking. When it's high (85+), I push hard.

Women's Health Features (From My Wife's Experience)

My wife stole my Oura Ring 4 for a month to test the cycle tracking. Her take:

"It predicted my period start date within 24 hours for two cycles. The fertile window feature is wild — it uses temperature shifts to estimate ovulation. I wish I had this in my 20s."

The ring tracks:

• Period predictions

• Cycle phases

• Fertile windows

• Pregnancy insights

If you're tracking cycles naturally or trying to conceive, this is a game-changer.

Oura Ring 4 vs Competitors: Quick Comparison

Feature

Oura Ring 4

Samsung Galaxy Ring

RingConn Gen 2

Price

$349 + sub

$399 (no sub)

$299 (no sub)

Subscription

$5.99/month

Free

Free

Battery Life

7-8 days

6-7 days

5-6 days

Sleep Accuracy

Excellent

Good

Good

Activity Tracking

Basic

Better (with Samsung phones)

Basic

Size Range

4-15

5-13

6-14

Women's Health

Best in class

Basic

Basic

Bottom line: The Galaxy Ring makes sense if you have a Samsung phone and hate subscriptions. But Oura's sleep accuracy and women's health features are noticeably better.

Pros and Cons: My Honest List

What I Love

• Comfortable enough to forget — I sleep in it, shower in it, live in it

• Actionable insights — not just data, but "here's what to do"

• Battery lasts a week — way better than watches

• Looks like jewelry — no one knows it's a tracker

• Cycle tracking — genuinely useful for women

What Frustrates Me

• Subscription fee — $5.99/month adds up ($70/year)

• Manual workout start — annoying when I forget

• Scratches easily — my gold finish shows wear after 3 months

• Proprietary charger — lose it, you're screwed

• Expensive — $349 is a lot before the monthly fee

Who Should Buy the Oura Ring 4?

Buy this if:

• You care about sleep quality and recovery

• You want to understand your body's patterns

• You're tracking menstrual cycles or trying to conceive

• You hate wearing watches to bed

• You're a "biohacker" type who loves data

Skip this if:

• You're a serious athlete needing workout metrics

• You refuse to pay subscriptions (look at Samsung instead)

• You want real-time heart rate during exercise

• You're on a tight budget

Pricing and Where to Buy

The Oura Ring 4 costs:

• Silver / Black: $349

• Brushed Silver / Stealth: $399

• Gold / Rose Gold: $499

• Ceramic finishes: $499+

Plus $5.99/month for Oura Membership (required for full features). First month free.

Where to buy:

• Amazon — fast shipping, easy returns

• Oura's official site — sometimes has bundle deals

• Best Buy — you can try sizing kits in store

Pro tip: Order the sizing kit first ($10 refundable) before buying. The fit needs to be snug but comfortable. I wear size 10 on my index finger, but size 9 on my middle finger. Try before you buy.

My 90-Day Verdict: Is It Worth It?

After three months of 24/7 wear, here's my honest take:

The Oura Ring 4 is the best smart ring on the market. It's not perfect — the subscription annoys me, and workout tracking needs work. But for what it does do well (sleep, recovery, women's health, trends), nothing else comes close.

I've learned more about my body in 90 days with this ring than years of guessing. I drink less, sleep better, and recover smarter. That's worth the $349 + subscription to me.

Final score: 92/100

If you're on the fence: order the sizing kit first. Wear it for a day. If you forget you're wearing it, buy the ring. If it bothers you, skip it.

Frequently Asked Questions (FAQ)

Q: Is the Oura Ring 4 waterproof?

A: Yes, it's water resistant up to 328 feet. I shower with mine daily and swam in the pool with it. No issues. Just don't scuba dive with it.

Q: Can I wear Oura Ring 4 without subscription?

A: Technically yes, but you'll only see three daily scores — no detailed data, no insights, no trends. The subscription unlocks everything that makes the ring useful. Budget for it.

Q: How accurate is Oura Ring 4 heart rate?

A: Compared to medical-grade ECG, Oura claims 99.9% accuracy for resting heart rate. In my testing against Apple Watch, it's within 1-2 BPM at rest. During workouts, it lags behind watches but still usable.

Q: Which finger should I wear it on?

A: Oura recommends index finger for best accuracy. I wear mine on index finger during sleep and switch to middle finger sometimes during the day. Data remains consistent.

Q: Does Oura Ring 4 work with iPhone and Android?

A: Yes, both. App is well-designed on iOS and Android. Works with Apple Health and Google Fit.

Q: How long does shipping take in the US?

A: Amazon ships in 1-2 days. Oura's official site takes 5-7 business days. Sizing kit arrives separately in 3-5 days.

Q: Can I return it if it doesn't fit?

A: Yes, 30-day return policy on Oura's site. Amazon also accepts returns within 30 days. Buy the sizing kit first to avoid hassle.

Final Thoughts

The Oura Ring 4 isn't cheap. The subscription isn't fun. But if you're serious about understanding your sleep, recovery, and overall health, it's the best tool I've found.

After 90 days, I'm keeping mine. My wife ordered one after stealing mine for a month. My running buddy bought one after seeing my data.

Sometimes the hype is real. This is one of those times.

Disclaimer: This review contains affiliate links. If you purchase through these links, I may earn a commission at no extra cost to you. I bought this product with my own money and all opinions are my own based on 90 days of testing. Last updated: March 2026.