Oura Ring 4 vs Ring Gen 3: Better Sensors and 8-Day Battery — Worth Upgrading?

Oura practically invented the smart ring category, and the Generation 3 dominated for years. Now that the Ring 4 is here, the question for existing Gen 3 owners is simple: are the improvements worth $349? The Ring 4 refines hardware rather than reinventing the wheel—better comfort, sensing accuracy, and battery longevity—but the Gen 3 isn’t suddenly obsolete. Here’s what actually changed and whether it justifies the upgrade.

Key Differences

• Weight & Build: The Ring 4 is lighter (3.3g) compared to the Ring 3 (4.0g) and features a fully titanium interior, replacing the epoxy/resin inner molding of the Gen 3.
• Sensor Design: The Ring 4 features fully recessed sensors, eliminating the small “bumps” found on the inside of the Ring 3 for a smoother fit.
• Battery Life: The Ring 4 extends usage up to 8 days (192 hours), whereas the Ring 3 tops out at 7 days (168 hours).
• Sizing: The Ring 4 offers a wider range of sizes compared to the legacy sizing of the Gen 3.

Deep Dive Comparison

Design & Comfort

The immediately noticeable difference is the material construction. The Oura Ring 3 uses a titanium exterior shell with a non-allergenic, non-metallic (epoxy) inner molding. While comfortable, it included three small sensor bumps that some users found irritating after long wear.

The Oura Ring 4 solves this by moving to a full titanium body—inside and out—and completely recessing the sensors. This makes the ring perfectly round and flush against the skin. Furthermore, at just 3.3g, the Ring 4 is significantly lighter than the 4.0g Ring 3, making it even easier to forget you are wearing it.

Battery Life

Smart rings are prized for their “set it and forget it” nature, and battery life is critical here. The Ring 3 set the standard with up to a week of life. The Ring 4 pushes this further, optimizing power consumption to reach up to 8 days on a single charge based on the size of the ring.

Health & Accuracy

Both devices track the core “Oura trifecta”: Sleep, Readiness, and Activity. They both monitor Heart Rate, HRV (Heart Rate Variability), SpO2 (Blood Oxygen), and skin temperature trends to predict illness or cycle tracking.

However, the Ring 4 introduces more signal pathways (more pairs of LEDs and sensors working together) to ensure data accuracy is maintained even if the ring rotates on your finger—a common issue with the Ring 3, which required the flat “heritage” edge to be facing up for optimal reading.

Price & Value

The Oura Ring 3 launched at $299, and while it can arguably be found for less now during sales, it remains a premium device. The Oura Ring 4 enters the market at a higher price point of $349. Both rings require the Oura Membership (roughly $6/month) to access full data insights, which is a long-term cost factor to consider for either device.

Technical Specs

Feature	Oura Ring 4	Oura Ring 3
Material	Titanium (Full)	Titanium w/ Epoxy Inner
Weight	3.3g	4.0g
Battery Life	Up to 192 hours (8 days)	Up to 168 hours (7 days)
Water Rating	100m	100m (10 ATM)
Sensors	Red/Green/IR LEDs, Temp, Accelerometer	Red/Green/IR LEDs, Temp, 3D Accelerometer
Launch Price	$349	$299

The Verdict

If this is your first smart ring or you have sensitive skin, buy the Oura Ring 4. The recessed sensors and full titanium build make it the most comfortable wearable on the market today, and the improved accuracy ensures you don’t lose data if the ring spins on your finger.

However, if you are upgrading from a Gen 2 or looking for a deal, the Oura Ring 3 remains 90% of the experience for a lower price. It uses the same app and algorithms; you simply sacrifice a bit of battery life and the seamless interior design.