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Oura Ring 4 specifications and in-depth review

Oura Ring 4

Manufacturer: Oura

The Oura Ring 4 is a screenless smart ring designed for continuous health and wellness tracking. Weighing just 5.2 g with a width of 7.9 mm and a thickness of 2.88 mm, it sits discreetly on the finger while collecting around-the-clock biometric data. It is compatible with both Android and iOS devices and supports wireless charging for everyday convenience.

On the sensor side, the Oura Ring 4 includes a heart rate monitor, a pulse oximeter for blood oxygenation readings, a body temperature sensor, and an accelerometer. It tracks steps, sleep, and automatically detects activities, while the companion app adds calorie burn estimates, food and water intake logging, weight tracking, temperature trends, period notifications, and an exercise diary. The ring carries a 100 m waterproof rating and charges fully in approximately 1.2 hours, delivering up to 8 days of use per charge.

Pros
  • Waterproof to 100 m, making it suitable for swimming and water activities without needing removal
  • Extremely light at 5.2 g with a slim 2.88 mm profile, designed for all-day and all-night wear
  • Battery lasts up to 8 days and recharges fully in around 1.2 hours via wireless charging
  • Tracks sleep with detailed sleep reports, offering meaningful insight into rest quality
  • Monitors heart rate, blood oxygenation, and body temperature continuously from the finger
  • Compatible with both Android and iOS devices
Cons
  • No display or touch screen, so all data must be viewed through the companion app on a phone
  • Lacks GPS, meaning distance, pace, and route tracking are not available
  • No vibrating alerts, notifications, or alarms of any kind, limiting real-time feedback
  • Does not support multi-sport mode, elevation tracking, or cadence measurement
  • No NFC, Wi-Fi, or cellular connectivity, restricting how data is synced and accessed
  • App is not ad-free and requires an account, adding ongoing dependencies for basic use
Who is this for?

The Oura Ring 4 is well suited to users who prioritize continuous health monitoring without the bulk or visual presence of a traditional wearable. Its slim, screenless form and 5.2 g weight make it a natural fit for people who want to track biometrics — heart rate, blood oxygenation, body temperature, and sleep — around the clock, including during sleep, without discomfort. The 8-day battery life and waterproof rating also make it a practical choice for those who prefer a low-maintenance device that stays on through daily routines, workouts, and water exposure alike. Users focused on recovery, sleep quality, and general wellness trends will find the available data meaningful and well-rounded.

Who is this NOT for?

Users who need real-time feedback during workouts — such as GPS-based route tracking, pace measurement, or cadence data — will find this device inadequate, as none of those capabilities are present. It is also a poor match for anyone who relies on wearable notifications, alerts, or call controls throughout the day, since the ring offers no display, no vibrations, and no smart alarm functionality. Athletes engaged in multi-sport training or outdoor navigation will quickly hit the limits of what the device can capture, and those who prefer to manage data directly from a desktop will find no Windows or Mac OS X compatibility available.

Design:

has a touch screen ✕
Has a display ✕
waterproof depth rating 100 m
is a smart ring ✓
width 7.9 mm
thickness 2.88 mm
weight 5.2 g

The Oura Ring 4 is a smart ring with no display or touch screen, keeping its form factor minimal and discreet. It measures 7.9 mm in width and 2.88 mm in thickness, and tips the scales at just 5.2 g, making it light enough to wear continuously without discomfort. Despite its compact build, it carries a 100 m waterproof depth rating, meaning it handles swimming and water exposure without issue.

Sensors:

has GPS ✕
Has a heart rate monitor ✓
Monitors blood oxygenation levels ✓
Has ECG technology ✕
Has a temperature sensor ✓
Has a barometer ✕
has a gyroscope ✕
Has a cadence sensor ✕
Monitors perspiration ✕
has a compass ✕
has an accelerometer ✓

The Oura Ring 4 includes a heart rate monitor, a pulse oximeter for continuous blood oxygenation tracking, a body temperature sensor, and an accelerometer for motion detection. It does not feature GPS, ECG technology, a barometer, gyroscope, cadence sensor, perspiration monitor, or compass, keeping its sensor suite focused on core biometric and movement data.

Activity tracking:

Detects activities automatically ✓
Has multi-sport mode ✕
Has exercise tagging ✓
Tracks elevation ✕
Tracks distance ✕
Tracks steps taken ✓
Has a route tracker ✕
Measures pace ✕
Tracks your sleep ✓
Provides sleep reports ✓
Has a stroke counter for swimming ✕
Designed for diving ✕
Designed for golf ✕

The Oura Ring 4 handles activity tracking through automatic activity detection, exercise tagging, and step counting, giving users a straightforward picture of their daily movement. It also offers sleep tracking alongside detailed sleep reports, making rest monitoring a central part of its feature set. On the other hand, it does not support multi-sport mode, elevation or distance tracking, pace measurement, route tracking, swim stroke counting, and it is not designed for diving or golf.

Connectivity:

supports Wi-Fi ✕
has NFC ✕
Is compatible with Android ✓
Is compatible with iOS ✓
supports ANT+ ✕
has a cellular module ✕

The Oura Ring 4 is compatible with both Android and iOS devices, covering the two major mobile platforms. It does not include Wi-Fi, NFC, ANT+, or a cellular module, so connectivity relies entirely on pairing with a smartphone.

Battery:

battery life 8 days
charge time 1.2 hours
has wireless charging ✓
Has a solar power battery ✕
has a rechargeable battery ✓
has a removable battery ✕

The Oura Ring 4 runs on a built-in rechargeable battery that lasts up to 8 days per charge and replenishes fully in approximately 1.2 hours via wireless charging. The battery is not removable and there is no solar charging option.

Features:

Has smart alarm ✕
Has silent alarm ✕
Has call control ✕
Locates your phone ✕
Has vibrating alerts ✕
Has notifications ✕
Has a stopwatch ✕
Can be used to answer calls ✕
Has a built-in camera remote control function ✕
warranty period 1 years
Has auto pause ✕
has voice commands ✕
Acquires GPS faster ✕

The Oura Ring 4 takes a passive, sensor-focused approach and omits many interactive features found on traditional wearables. It has no alarms of any kind, no vibrating alerts or notifications, no call control or headset capability, no stopwatch, no voice commands, no auto pause, no find-phone function, no camera remote, and no fast GPS lock. The device comes with a 1-year warranty, which is the one notable item in this section.

App & Software:

Counts how many calories you've burned ✓
Provides activity reports ✓
Has inactivity alerts ✕
Has achievements ✓
Has barcode scanner on app ✕
Can be personalised ✕
Has music playback ✕
Has weight tracking ✓
Tracks calorie intake ✓
Tracks water intake ✓
Has temperature tracking ✓
Doesn’t require account ✕
Has period notifications ✓
Ad-free ✕
Has exercise diary ✓
Free app ✓

The companion app for the Oura Ring 4 is free to download and covers a broad range of health data, including calorie burn, activity reports, weight tracking, food and water intake logging, temperature tracking, an exercise diary, period notifications, and achievements. An account is required to use the app, and it is not ad-free. Features such as inactivity alerts, a barcode scanner, app personalisation, and music playback are not available.

Miscellaneous:

water resistance Waterproof
has a battery level indicator ✕
has an external memory slot ✕
has a socket for a 3.5 mm audio jack ✕
Is compatible with Windows ✕
Is compatible with Mac OS X ✕

The Oura Ring 4 is rated as waterproof, making it suitable for use in water without concern. It does not have a battery level indicator, an external memory slot, or a 3.5 mm audio jack, and it is not compatible with Windows or Mac OS X desktop operating systems.

Final Verdict

The Oura Ring 4 occupies a clear and deliberate niche in the fitness tracker category — it is a passive, sensor-driven device built around continuous biometric monitoring rather than active workout guidance or smart device interaction. Its strengths lie in its unobtrusive form and the depth of health data it collects, from heart rate and blood oxygenation to temperature trends and detailed sleep tracking, all delivered through a ring that weighs just 5.2 g and lasts up to eight days on a single charge. Users who expect GPS, real-time alerts, or sport-specific metrics will need to look elsewhere, but for those whose primary goal is understanding their body's daily rhythms and recovery patterns, the Oura Ring 4 represents a focused and well-executed tool for that purpose.

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