Sleep tracking remains a core feature of wearable devices, and the data it collects tells you whether you are ready for a tough workout or should take a rest day. To find out which wearable is the best bedfellow, I wore the new Samsung Galaxy Watch Ultra 2, the Google Fitbit Air, and the Oura Ring 5 for several weeks and compared every aspect of their sleep monitoring.
A 3-gram ring versus a 94-gram watch for nighttime comfort
The most obvious difference lies in how each device is worn. The Galaxy Watch Ultra 2 has a substantial 47mm case and weighs 94 grams, which is borderline for comfortable sleep tracking. I was aware of it during the day and even more so when I woke up. The new Marine Band is soft and flexible, but despite the air channel underneath, it tends to get hot. The Fitbit Air is altogether different, with a soft fabric band secured by a hook-and-loop system that makes it highly adjustable. It heats up less than the Galaxy Watch Ultra 2, and at 11 grams it is barely noticeable on the wrist, day or night. The Oura Ring 5, finally, is a smart ring weighing just 3 grams, making it the lightest and least obtrusive of the trio. Once you get the sizing right and adjust to wearing a ring, it becomes the ideal sleep tracker if you prefer not to feel a device on your body.
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Three apps, three philosophies for presenting sleep data
For data interpretation, the Galaxy Watch Ultra 2 relies on the recently updated Samsung Health app, the Fitbit Air uses Google's Health app, and the Oura Ring 5 has its own dedicated application. Samsung Health presents all sleep data on a single page, including a sleep score, stage graphs, blood oxygen saturation, heart rate, and skin temperature. I appreciate the playful icons tied to the sleep score, the comparison with age-group averages, and the achievement awards. Google Health, on the other hand, makes it harder to find your sleep data by spreading it across the Sleep and Health tabs. Still, I like how it shows trends alongside the current score, and the graphs are bold and instantly readable. The Oura Ring app has a friendlier style and downplays complex graphs, using simple line charts to highlight outliers or areas of concern. All the data is there, but you have to scroll to locate it. Oura also emphasizes key metrics such as resting heart rate, sleep debt, and sleep efficiency. The app clearly prioritizes sleep, and it shows in the clean presentation.
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Sleep scores match but stage breakdowns differ
When I left all three devices to track sleep automatically, the Oura Ring 5 and Galaxy Watch Ultra 2 recorded nearly identical total sleep time, in line with my own estimate. The Fitbit Air logged 30 minutes more than my perceived duration. Interestingly, the sleep score was exactly the same across all three, an 88. Google Health recorded more time in Light sleep and less in REM and Deep sleep, while Oura and Samsung Health largely agreed on the stages. Discrepancies in sleep staging can make it harder to spot issues, and this is an important aspect of any sleep tracker. Google Health also tended to record a higher resting heart rate than the other two. Blood oxygen levels, heart rate variability, and respiratory rate were almost identical across the board. The other major anomaly came from Samsung Health, which registered 40 minutes of awake time during the night, while the others barely logged any. It appears Samsung Health interprets slight movement as wakefulness and is also quick to assume I am napping whenever I sit still watching a movie. The software may be refined after release, as I am using a pre-launch unit.
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AI coaching goes from generic to genuinely personal
Numbers and graphs are only half the story. Each app provides guidance for improving sleep, and this is where the platforms diverge even more. Google Health includes an AI Health Coach that weaves in exercise history, weather conditions, and sleep data to suggest whether you should work out or skip it. When I asked the coach how to lower my overnight respiratory rate, which it records as higher than the other wearables, the answer was detailed and useful. It showed my results were average and recommended reducing stress, building cardio fitness, and keeping a consistent sleep schedule. Oura Advisor, the AI inside the Oura app, works in a similar way and offers prompts such as asking what has been affecting your sleep score lately. I asked Advisor the same respiratory rate question, and the response felt more personal, as it examined my long-term trends and integrated other data points. This could be because Oura had five years of my data, while Google Health had only two months. Samsung Health, by contrast, lacks an AI chatbot. It summarizes your sleep and daily activities on the main page, offering suggestions and targets, while a sleep coaching feature unlocks after seven consecutive nights and helps with sleep hygiene if an issue is detected.
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Pricing and subscriptions may sway your decision
Cost is always a major factor. The Oura Ring 5 starts at $400 and requires a $6 per month subscription; without it, you only see daily scores. The Fitbit Air costs $100, and to access the AI Health Coach you need the $10 per month Fitbit Premium subscription. The Galaxy Watch Ultra 2 is $700, but Samsung Health is completely free to use. Samsung Health also works with the cheaper $380 Galaxy Watch 9 and the $400 Galaxy Ring. This pricing structure is similar to the one we examined in our article about Samsung's silicon-carbon batteries, where long-term value plays a crucial role in deciding which device fits your wallet.
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Final verdict after weeks of sleep data
Weighing comfort, app design, data presentation, and in-app advice, the Oura Ring 5 is the best wearable for sleep tracking when compared with the Fitbit Air and the Samsung Galaxy Watch Ultra 2. The Fitbit Air comes a close second, but the data inconsistencies make me trust it less despite the strengths of the AI Health Coach. The Fitbit Air is also a vastly superior exercise tracker, which is not the Oura Ring 5's strength. Samsung Health's features, despite the app redesign, remain limited. For those who only care about raw data and have no interest in chatting with an AI for feedback, the Galaxy Watch Ultra 2 might suffice. But for anyone who wants the most comfortable and insightful sleep companion, the Oura Ring 5 is the one I would buy. You can learn more about sleep tracking on Wikipedia and browse our other wearables comparisons for additional context.
