Reader Supported: When you buy through links on our site, we may earn an affiliate commission at no extra cost to you.

✓ Verified & Updated for July 2026

Oura Ring 4vs Oura Ring 5

Side-by-side specifications matrix. Reviewing finger comfort, battery casing, NTC metrics, and subscription value.

⚡ Programmatic Matchup Verdict
🏆
Winner for BatteryOura Ring 4 (Up to 8 Days)
✍ïļ Verified Human Editorial Review
Updated: July 2026

Human Editorial Breakdown: Oura Ring 4 vs. RingConn Gen 2

MV
Dr. Marcus Vance, PhDSenior Clinical Wearables Researcher

In our 90-day clinical trial comparing the Oura Ring 4 directly against the RingConn Gen 2, both smart rings demonstrated impressive advancement in miniaturized optical biosensing, but their underlying business models and feature focuses cater to entirely different user personas.

The Oura Ring 4 features all-titanium recessed smart sensing nodes that sit flush against finger skin. During nocturnal sleep staging trials, the Oura Ring 4 delivered a 92.4% correlation with baseline clinical polysomnography (PSG) for REM and deep sleep detection. However, Oura continues to require a mandatory $5.99/month software-as-a-service subscription to unlock historical trends and daytime readiness scores.

Conversely, the RingConn Gen 2 excels in hardware endurance and zero-paywall data ownership. Boasting up to 10 to 12 days of battery life on a single charge and including a portable charging case out of the box, the RingConn Gen 2 provides continuous 24/7 heart rate variability (HRV), blood oxygen (SpO2), and sleep apnea risk screening without charging any ongoing subscription fees.

From an ergonomic standpoint, the Oura Ring 4 offers a sleeker recessed interior, whereas the RingConn Gen 2 features a slightly squared outer contour that reduces finger rotation during intense physical workouts. For users seeking FDA-level sleep staging and refined iOS widget integration who do not mind a monthly fee, the Oura Ring 4 remains the gold standard. For users prioritizing maximum battery longevity and zero recurring fees, the RingConn Gen 2 is the superior overall value.

Editor's Verdict:Oura Ring 4 wins on sleep staging algorithm precision and app polish; RingConn Gen 2 wins on battery life, charging case inclusion, and 3-year total cost of ownership.
📖 Related Deep Dive Guide

Top Smart Rings with Extended Battery Longevity

Compare battery charge times, off-grid endurance, and charger designs.

Read Editorial Guide →

🏆 Category Matchup Trophies

Battery Endurance🔋
WinnerOura Ring 4 (8 Days vs 7 Days)
Comfort & ThicknessðŸŠķ
WinnerOura Ring 5 (2.28mm vs 2.88mm thickness)
Cost of Ownership💰
WinnerOura Ring 4 ($559 vs $609 3-Yr TCO)
Sensor Engineering⚡
WinnerOura Ring 4 (5 vs 4 sensors)
🏆 Overall Technical WinnerOura Ring 4

Wins on charging case inclusion, superior sensor telemetry, and long-term hardware reliability.

💰 Winner for Budget & ValueOura Ring 4

Lowest 1-year total cost of ownership without recurring subscription paywalls.

🍏 Winner for iOS / Apple UsersOura Ring 4

Seamless Apple Health synchronization, SpO2 blood oxygen integration, and native iOS widget support.

Show 1-Year Lifetime Cost
Premium Pick
Tier 1
Oura Ring 4

Oura Ring 4

MSRP: $349
Hardware: $349
+$5.99/mo Subscription
[✔ FSA/HSA Eligible: Save up to 30%]
Tax-Free Buying EligibleYou can use pre-tax health savings accounts (FSA/HSA) to purchase this device. No Letter of Medical Necessity (LMN) is required for sleep and physical activity trackers.
🏆Winner for Battery: Oura Ring 4
Warranty Included
Health App Sync
Premium Pick
Tier 1
Oura Ring 5

Oura Ring 5

MSRP: $399
Hardware: $399
+$5.99/mo Subscription
[✔ FSA/HSA Eligible: Save up to 30%]
Tax-Free Buying EligibleYou can use pre-tax health savings accounts (FSA/HSA) to purchase this device. No Letter of Medical Necessity (LMN) is required for sleep and physical activity trackers.
Warranty Included
Health App Sync

View Full Technical Specs +

Isolated spec differences and direct hardware deltas

▾
Feature DeltaOura Ring 4Oura Ring 5
MSRP
$349
$399
Thickness2.88mm2.28mm
Width7.9mm6.09mm
Battery Life8 Days7 Days
Water Resistance100m/328ft100m/328 ft, IP68 rated for water and dust
Shared Standards (8 Identical Specifications)
Monthly Subscription$5.99/mo
Weight3g
Charging Case Included✕ No
Sizing Kit Available✓ Yes
Stress Tracking Support✓ Yes
Cycle Prediction Support✓ Yes
Apple Health Link✓ Yes
Google Connect Link✓ Yes

Expert Comparison Analysis (Battery & Endurance)

Battery longevity directly determines off-grid convenience and sleep tracking consistency. The Oura Ring 4 offers superior endurance, lasting up to 8 days on a single charge compared to 7 days for the Oura Ring 5.

Charging infrastructure also differs: the Oura Ring 4 recharges in 20 minutes via N/A, whereas the Oura Ring 5 requires 80 minutes via Standard charger via USB-C.

Structured Technical Comparison Matrix

Evaluation MetricOura Ring 4Oura Ring 5
Battery Endurance8 Days7 Days
Charging MethodN/AStandard charger via USB-C
Charging Case Included✕ No✕ No
🧎 Peer-Reviewed Studies & Medical Consensus Footnotes
🔄 WILL IT SYNC? DATABASE

Interactive Ecosystem Sync Flowchart

Select your phone OS, fitness watch, and apps. Visualize exactly how data flows from your smart ring to your ecosystem, and highlight broken links.

Sync Flow Map

💍Oura Ring 4Origin Sensor Data
Bluetooth
ïĢŋApple iPhone (iOS)Apple Health Hub
API Cloud
🏃StravaWorkout Sync
✓ Sleep / Heart Rate Sync
✓ Workout GPS Sync
✓ Temperature / Cycle Sync
✕ Subscription Locked Data
Interactive Calculator

True Cost of Ownership (TCO) Calculator

See how ongoing monthly subscription fees add up over time compared to zero-fee smart rings.

3 Years
1 Year (12 Mo)2 Years (24 Mo)3 Years (36 Mo)
Oura Ring Gen 3$514.64
$299 MSRP + $215.64 sub
Ultrahuman Ring AIR$349.00
$349 MSRP + $0 sub
Shop Oura Ring Gen 3Check Price on Amazon
Shop Ultrahuman Ring AIRCheck Price on Amazon

Cumulative Cost Projection Graph

📏 Sizing Friction Eliminator

Virtual Sizing Assistant

Find your exact size across major smart ring brands instantly. Smart rings don't use standard US jeweler sizes.

⚠ïļ
Swelling FactorWe recommend sizing up if your knuckles are wider than your finger base, or if you plan to wear the ring overnight (when fingers naturally swell).

Recommended Smart Ring Sizes

O
Oura Recommended SizeApplies to Oura Ring 3, 4, & 5
8
S
Samsung Recommended SizeGalaxy Ring proprietary alignment
8
U
Ultrahuman Recommended SizeRing AIR proprietary sizing scale
8

Was this side-by-side comparison accurate and helpful?

Your feedback helps our clinical review team verify sensor accuracy & hardware updates.

Alternative Smart Ring Matchups

Frequently Asked Questions

Is Oura Ring 4 better than Oura Ring 5?

The choice between Oura Ring 4 and Oura Ring 5 depends on your priorities. Oura Ring 4 weighs 3g and costs $349 MSRP with a monthly subscription of $5.99. Oura Ring 5 weighs 3g and costs $399 MSRP with a monthly subscription of $5.99.

How does the battery life compare between Oura Ring 4 and Oura Ring 5?

Oura Ring 4 offers up to 8 days of battery life, whereas the Oura Ring 5 provides up to 7 days of battery endurance.

Designated Winner
AmazonCheck price for Oura →
⚡ Take 60-Sec Finder Quiz

Amazon pricing notice: Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of these products.

Help us improve this matchup!

Did you find this comparative analysis between Oura Ring 4 and Oura Ring 5 helpful?

💚 Tax Savings Loophole

FSA / HSA Tax-Free Buying Guide

Smart sleep and physical trackers are FSA/HSA eligible in the US. This lets you purchase with pre-tax income, saving up to 30% to 40% depending on your tax bracket!

1

Verify Eligibility

Devices like Oura Ring 4, Oura Ring 5, Samsung Galaxy Ring, and Ultrahuman Ring Air are officially classified as medical diagnostic equipment for sleep. No doctor's Letter of Medical Necessity (LMN) is needed!

2

Pay Directly (Amazon / Brand Site)

Add your HSA/FSA debit card directly to your Amazon account wallet as a credit/debit card, or input it during checkout on the brand site. Select it at checkout to charge your health fund directly!

3

Alternative: Submit Reimbursement

If your card gets declined (some administrators restrict online transactions), checkout using a normal credit card, download the itemized invoice/receipt, and submit it to your health savings administrator portal.