Is the Oura Ring 4 Worth Buying or Upgrading?

TL;DR

The Oura Ring 4 measures nighttime heart rate and heart rate variability closely against a Polar H10 ECG chest strap, with only limited deviations and possible omissions when the reviewer left bed. Its main advantage over the Oura Ring 3 appears to be less missing data, but the reviewer doubts that this relatively small improvement justifies upgrading for most existing users.

Transcript

if you're considering getting the new Aura ring 4 you're likely to fall into one of two categories one you're a new user and you're checking out different smart rings and SmartWatches or two you already own an ordering three and you're looking to upgrade today we will therefore scientifically answer two questions one is the ordering for a good heal... Read More

Key Insights

• The Oura Ring 4’s main technical change is smart sensing, which automatically selects an effective signal path based on the wearer’s physiology and the ring’s position. This is intended to maintain accurate, continuous collection even when the ring shifts around the finger.
• The Oura Ring 4’s nighttime heart-rate measurements closely matched a Polar H10 ECG chest strap across four nights. The ring followed both sustained higher rates and later declines, with only a few notable discrepancies during apparent periods when the reviewer got out of bed.
• The Oura Ring 4 may exclude some out-of-bed heart-rate increases from its nighttime measurements. The ECG reference detected several elevated values that the ring did not, but the reviewer believes these likely occurred during bathroom trips and may fall outside the ring’s intended in-bed reporting.
• The Oura Ring 4’s heart rate variability measurements generally agreed well with the ECG reference. It captured overnight patterns such as lower HRV early in the night and higher HRV later, although measurements showed somewhat more deviation when HRV values were higher.
• The Oura Ring 4 appears to reduce missing nighttime data compared with older Oura Ring 3 results. Historical Generation 3 examples contained several gaps in both heart-rate and HRV measurements, while the four tested Generation 4 nights showed more continuous collection.
• The evidence for improvement over the Oura Ring 3 is provisional because the comparison uses Generation 3 results from the end of 2021 and another night from 2022. The reviewer plans to retest both generations with current firmware before making a stronger conclusion.
• The Oura Ring 4’s battery life is rated at up to 8 days, compared with 7 days for the Oura Ring 3. The reviewer considers this a small improvement rather than a major reason for an existing Generation 3 owner to upgrade.
• The correct Oura Ring size should be tested for a full day and night under varied conditions. Fingers can swell during certain sports or while sleeping in a warmer room, making a size that initially seems appropriate uncomfortable during actual use.

Questions & Answers

Q: How accurate is the Oura Ring 4 for nighttime heart rate?

The Oura Ring 4 measured nighttime heart rate very closely to a Polar H10 ECG chest strap across four nights. It followed sustained periods of higher heart rate and subsequent declines with strong overall agreement. A small number of elevated readings appeared only on the chest strap, likely when the reviewer left bed, so the ring may intentionally omit activity occurring outside the sleeping period.

Q: How accurate is Oura Ring 4 heart rate variability tracking?

The Oura Ring 4’s heart rate variability measurements generally agreed well with the Polar H10 ECG reference. It reproduced overnight changes, including periods of relatively low HRV followed by higher HRV later in the night. Agreement was especially close in the lower HRV range, while somewhat greater deviation appeared at higher values. The reviewer still considered the results sufficient for understanding general overnight HRV patterns.

Q: Should Oura Ring 3 owners upgrade to the Oura Ring 4?

Most Oura Ring 3 owners probably do not need to upgrade based on the tested nighttime measurements. Generation 3 already produced strong heart-rate and HRV measurements, while Generation 4’s primary apparent benefit is less missing data. The reviewer regards that improvement as relatively small and doubts it will create meaningful real-world differences for most users, although Generation 4 would be the preferred choice when selecting between the two.

Q: What is smart sensing on the Oura Ring 4?

Smart sensing is the Oura Ring 4 technology designed to adapt automatically to a wearer’s physiology and find an effective signal path. According to Oura’s claim as presented in the review, this should support continuous and accurate data collection even if the ring shifts on the finger. The reviewer’s measurements suggest better data continuity, but they do not establish how much of that result comes specifically from smart sensing.

Q: Does the Oura Ring 4 collect less missing data than the Oura Ring 3?

The presented results suggest that the Oura Ring 4 has less missing nighttime heart-rate and HRV data than the Oura Ring 3. Several older Generation 3 examples contained visible gaps, while Generation 4 produced more continuous measurements across four nights. However, the Generation 3 data came mainly from the end of 2021, with another example from 2022, so a simultaneous comparison using current firmware is still needed.

Q: How long does the Oura Ring 4 battery last?

The Oura Ring 4 is described as lasting up to 8 days on a single charge. That is one day longer than the Oura Ring 3’s stated 7-day battery life. The reviewer considers the change modest and does not present it as a compelling upgrade reason by itself. Actual battery performance was not separately quantified in the provided test discussion.

Q: How should you choose the correct Oura Ring 4 size?

Use the free sizing kit and wear the proposed final size for at least one complete day and night. Test it under different conditions because finger size can change. The reviewer found that fingers could swell slightly during certain sports or when sleeping in a warmer room, turning a size that initially felt correct into an uncomfortable choice during normal use.

Q: Is the Oura Ring 4 more comfortable than the Oura Ring 3?

The Oura Ring 4 has a fully round interior shape and recessed sensors intended to improve comfort. Its interior is still not perfectly flush, although the sensor structure is less noticeable than on the Oura Ring 3. The reviewer was not sensitive to these differences and did not consider either design uncomfortable, so the review does not establish a major comfort advantage for Generation 4.

Summary & Key Takeaways

• The Oura Ring 4 introduces smart sensing technology that adapts signal paths to the wearer’s physiology and ring position. Its fully round interior, recessed sensors, and battery life of up to 8 days provide modest design changes, while the reviewer identifies improved measurement continuity as the most potentially meaningful upgrade.

• Across four nights, the Oura Ring 4’s heart-rate measurements closely followed a Polar H10 ECG chest strap. Most discrepancies involved higher readings detected by the chest strap when the reviewer apparently left bed, suggesting that the ring may intentionally focus its nighttime reporting on periods when the wearer remains in bed.

• Heart rate variability also showed strong agreement between the ring and ECG reference, although deviations increased at higher HRV values. Older Oura Ring 3 test results contained more missing heart-rate and HRV measurements, but the reviewer says a current, simultaneous comparison is needed before drawing a definitive generational conclusion.