Best sleep trackers: a dated table of rings, bands and a bed sensor

What a sleep tracker does, and how this table was built

A sleep tracker senses movement and heart rate, sometimes skin temperature, and estimates when you were asleep. It then shows the night as a score, a set of stages and a trend. It is a wellness tool for noticing habits, not a sleep test.

This page reads ten makers’ own pages on October 16, 2026 and records what each states. A value the page did not state is left as “not stated on the page read”. It is a dated table, not a ranking. No accuracy score is invented, and no product is marked down. Elio, made by Chutex, appears with the facts from its product page.

Smartwatches are not in the table. They also track sleep, but they need a comparison of their own.

What does each type of sleep tracker suit?

Wearable or under the mattress?

A wearable can follow you to the gym and into the day, and it senses heart rate from the skin. An under-mattress sensor like Withings Sleep sits flat under the sheet and measures heart rate, breathing and movement through the mattress with a pneumatic sensor, and it has a sound sensor for snoring.¹⁰ It watches only the bed. If you share a bed, read the maker’s notes on partners before you buy.

Ring, band or arm strap?

Ring or band is mostly a comfort choice. The guide to a smart ring versus a fitness band compares them side by side. The Amazfit Helio Strap is worn on the arm.⁸ Elio is worn on the wrist or the upper arm.¹¹

What can a sleep tracker tell you, and what can it not?

A tracker can tell you when you went to bed, roughly when you fell asleep and woke, and how that varied across weeks. Several of these devices also report resting heart rate, heart rate variability and skin temperature during the night.⁴⁵¹¹

It cannot do what a sleep study does. The NHLBI says sleep studies use sensors that record eye movements and brain activity, which classify sleep phases and stages.¹² A ring, band or mattress sensor records neither. Stage minutes on a consumer device are estimates.

Withings says Sleep was developed with sleep physicians and tested against polysomnography. The page gives no accuracy figure, and this page does not invent one.¹⁰ The same is true across the table: where a maker publishes a comparison with a sleep lab, read the method before you rely on a number.

For how scores are built, see the guide to sleep scores. For the stages themselves, see sleep stages explained, deep sleep and REM sleep.

How much sleep should the number show?

The NHLBI says experts recommend that adults sleep between 7 and 9 hours a night, and that adults who sleep under 7 hours may have more health issues than those who sleep 7 or more.¹³ The CDC lists 7 or more hours for ages 18 to 60, 7 to 9 hours for ages 61 to 64, and 7 to 8 hours for ages 65 and older.¹⁵

Here is an illustration with made-up numbers. Suppose a tracker shows 6 h 40 min, 7 h 10 min, 6 h 55 min, 7 h 25 min, 6 h 30 min, 7 h 05 min and 7 h 00 min over a week. The total is 48 h 45 min, so the average is 48.75 ÷ 7 = about 6.96 hours, or roughly 6 h 58 min. That is close to 7 hours. One night under 7 hours is not a problem by itself; the weekly average is what the guidance is about.

If your average sits well under 7 hours for weeks, the number is telling you something. See how much sleep you need and sleep debt. A tracker is a nudge, and a doctor is the person to ask about persistent tiredness or loud snoring with pauses in breathing.

A two-week test before you decide

Write your bedtime and wake time in a notebook for the same two weeks. Then compare the tracker’s time asleep with your own estimate. The two will not match, because you cannot know when you fell asleep, but the gap should be steady. A tracker that is off by an hour one night and 15 minutes the next is harder to learn from.

Charge habits matter too. A device with a 15-day battery asks for a charge twice a month, and one with a 7-day battery asks for it weekly.⁷¹¹ Choose the routine you will keep.

These devices are wellness tools. The FDA’s general wellness guidance describes low risk products that promote a healthy lifestyle and separates them from products meant for disease care.¹⁴ Chutex describes Elio the same way: its measurements are indicative, and it is not FDA-cleared.¹¹

If you wear a device that tracks heart rate variability for recovery, see the best HRV monitors. For alternatives to a specific brand, see Oura Ring alternatives and WHOOP alternatives, and for the two head to head, Oura vs WHOOP. For trackers with no recurring fee, see best fitness trackers without a subscription.

Frequently asked questions