Amazfit Helio Strap vs Oura Ring 4: Which Should You Buy for Sleep Tracking?

Buy the Oura Ring 4 if you want the fuller nightly report: Oura lists the ring from $349 plus a membership of $5.99 a month or $69.99 a year for its Sleep Score, sleep stages and nighttime breathing screens. Buy the Amazfit Helio Strap if you want a screen-free band with no subscription and up to 10 days of battery, with one catch: Amazfit's US store showed the $99.99 Strap as sold out in October 2026, leaving the $199.99 Helio Strap Pro as the version you can order today.

The ring is the better sleep tracker on paper and the lighter thing to wear to bed at 3.3 to 5.2 grams; the strap is the cheaper thing to own, because nothing on Amazfit's page sits behind a monthly fee (all prices checked October 2026). Everything below is drawn from Amazfit's and Oura's own product pages, Oura's membership terms and the American Academy of Sleep Medicine's position statement on consumer sleep technology, rather than first-hand use.

Two different objects for the same job

The Helio Strap is a sensor pod on a 22 mm nylon band worn on the upper arm, listed by Amazfit at 20 g. Amazfit's own summary is "No screen. No noise. Just your body's data." It records night sleep and any nap longer than 20 minutes, heart rate variability, blood oxygen, stress and a daily readiness picture, and sends all of it to the Zepp App. Amazfit also makes a point of the sensor sitting "closer to the heart" than a wrist device, which is a training argument more than a sleep one: the brief is a workout band that tracks sleep well enough to let you skip a subscription.

The Oura Ring 4 is a fully titanium ring, 7.90 mm wide and 3.3 to 5.2 grams depending on size, with red and infrared LEDs for blood oxygen and a digital sensor for temperature trends. The sleep report is the product: a Sleep Score built from total sleep, HRV, nighttime movement and sleep regularity; a sleep stages breakdown of deep, REM and light sleep; a Nighttime Breathing screen; Bedtime Guidance that tells you when to start winding down; and a Readiness Score that folds temperature trends, heart rate and sleep into one number. Most of that sits behind the membership, which is the single biggest difference between these two devices.

Head-to-head on the makers' numbers

Spec (maker pages, checked October 2026)	Amazfit Helio Strap	Oura Ring 4
Price	$99.99 list; shown as sold out at Amazfit US	from $349; Gold finish $399
Subscription	none required	$5.99 a month or $69.99 a year; first month free for new members
Battery	up to 10 days from a 232 mAh cell	5-8 days, by ring size and use
Charging	magnetic charger	typically 20-80 minutes
Weight	20 g	3.3 to 5.2 grams
Water rating	5 ATM: showers and shallow swimming, not diving	water resistant to 100 m / 328 ft
Sensors	BioTracker 6.0 PPG, accelerometer, gyroscope, temperature	red and infrared LEDs, digital temperature sensor
Sleep features	night sleep and naps over 20 minutes; sleep breathing quality (switched on in the Zepp App); HRV, blood oxygen, stress	Sleep Score, sleep stages, Nighttime Breathing, Bedtime Guidance, Readiness Score
App	Zepp App	Oura App on iOS and Android
Current sibling model	Helio Strap Pro, $199.99, up to 11 days, skin temperature monitoring	Oura Ring 5, from $399, up to 6-9 days, from 2 grams

What each one tells you in the morning

Oura's page describes the morning report in plain terms. The Sleep Score is "based on your total sleep, heart rate variability (HRV), nighttime movement, sleep regularity, and more." The Sleep Stages screen gives "in-depth analysis of your deep sleep, REM sleep, and light sleep from the night prior." Nighttime Breathing is framed carefully: it helps you "learn if something could be off with your breathing patterns during sleep, and how frequently disturbances may be occurring", which is a prompt to talk to a doctor rather than a verdict. Bedtime Guidance nudges you toward a wind-down time, and the Readiness Score decides whether the day should be a hard one.

Amazfit's page is thinner on sleep detail, and that is a fair reflection of the product. It states that "Sleep monitoring can record night sleep and naps that last more than 20 minutes", that "Sleep Breathing Quality tracking needs to be enabled in the Zepp App", and that the strap gives "continuous insight into heart rate variability, sleep, blood oxygen, stress, exertion, and fitness level." There is no equivalent of Bedtime Guidance on the page, and no sleep-regularity scoring is described.

Neither maker's product page publishes a validation study for sleep staging, so this page prints no accuracy percentages for either device; the only honest statement is that both produce an estimate from heart rate, movement and temperature, and that Oura presents more of that estimate.

What the AASM says about devices like these

The American Academy of Sleep Medicine's position statement on consumer sleep technology, published in the Journal of Clinical Sleep Medicine and summarised on the AASM's own site (checked October 2026), is the right frame for both products. Its headline is that "Consumer sleep technology is no substitute for medical evaluation." It defines the category as "non-prescription devices such as wearables and mobile apps that are directly marketed to consumers to monitor sleep, improve sleep quality, or screen for sleep disorders", and then adds that "there are minimal data validating the ability of these devices to accurately perform these functions, and to date almost no consumer sleep devices have undergone review by the FDA."

The AASM's advice to clinicians applies to buyers too: tracker data "should be considered in the context of a comprehensive sleep evaluation and should not replace validated diagnostic testing." If you are shopping for either device because you suspect something is wrong with your sleep, talk to a doctor; the tracker's job is to give that conversation some data, not to replace it.

The subscription question, without arithmetic

Oura's pricing has two parts: the ring, from $349 for the Silver and Stealth finishes on Oura's store page, and the membership at $5.99 a month or $69.99 a year, with the first month free for new members. Oura's membership page is candid about what happens if you decline: "If you choose not to begin or continue your Oura Membership, your Oura Ring and Oura App will still function, but the insights, personal health data, and benefits you receive will be much more limited." You can cancel "whenever you choose", and "Even without a membership, you can export all of your Oura data in CSV format."

Amazfit's page repeats it in two wordings: "No subscription required." Whatever the Zepp App shows on day one is what it shows in year three. Both prices are printed above rather than multiplied out, because a membership that is cancelled in month four and a ring that is worn for five years produce very different totals. If recurring fees are the thing you are trying to avoid, our guide to the subscription trap in sleep tech walks through which sleep gadgets charge monthly and which do not.

Wearing it to bed

A ring is the easier thing to forget about. The Oura Ring 4 is titanium "inside and out", and Oura notes that "Minor scratches from regular wear are normal", so it is built to stay on through showers and dishwashing; it is water resistant to 100 m / 328 ft. The Helio Strap sits on the upper arm on a nylon band, is rated 5 ATM for "everyday wear, sweating, showering, and swimming in shallow water", and is "not intended for diving or high-pressure water activities." Side sleepers who already find a watch band annoying should think about where an arm band ends up when they roll over; the ring has no such problem.

Both are screen-free, which matters for the bedroom more than it sounds. There is nothing to glow, buzz or show a notification at 2 a.m., which is the same argument we make for getting the phone off the nightstand.

Battery and charging

The Helio Strap lists "Up to 10 days of battery life" from a 232 mAh cell on a magnetic charger; the Strap Pro lists up to 11 days with a charging time of two hours or less. The Oura Ring 4 lists 5-8 days "depending on ring size and your lifestyle" and "Typically charges in 20-80 minutes, depending on battery level." The practical difference is a charging habit: the strap can go a week and a half between charges, the ring wants a top-up roughly once a week, and both are quick enough to charge during a shower or a meal rather than overnight, which is the one time a sleep tracker must not be on the charger.

The Oura Ring 5 and the Helio Strap Pro change the top of the range

Both makers now sell a newer model above the two in this comparison, and both are worth a look before you decide.

The Oura Ring 5 is listed from $399 on Oura's store page. Its product page says "One charge lasts up to 6-9 days of battery life, depending on ring size and usage", lists the weight "From 2 grams (depending on ring size)", calls the ring "waterproof up to 100 meters (~330 feet)" including recreational diving, and offers a separate charging case that gives "A full day of battery life in 10 minutes". Oura also notes that existing members can "add Oura Ring 5 as a new device in the Oura App — no new Membership needed", so the ring price is the only step up. It is the ring to buy if you want the smallest and longest-lasting Oura and can stretch to $399; the Ring 4 at $349 is the ring to buy if you want the same app for less.

The Helio Strap Pro is $199.99 and in stock at Amazfit US (checked October 2026). It keeps the same BioTracker 6.0 PPG sensor and the same 232 mAh battery, but adds a temperature sensor and a geomagnetic sensor, lists "Skin Temperature Monitoring: Support", stretches battery life to up to 11 days and, in Amazfit's words, "builds on the foundation of Helio Strap, adding advanced movement tracking through a multi-sensor system designed to capture more than effort alone." For sleep tracking specifically, skin temperature is the one addition that matters, because temperature trends are part of how Oura builds its Readiness Score. With the standard Strap sold out, the Pro is the Amazfit device this page can send you to today: see the current price at Amazfit.

Which should you buy?

• You want the most complete sleep report and do not mind a membership: Oura Ring 4 from $349, or the Ring 5 from $399 if you want the longer battery and lighter ring.
• You want to pay once and never again: a Helio Strap. The $99.99 Strap is the better value if Amazfit restocks it; the $199.99 Strap Pro is the one in stock today, and it adds skin temperature.
• You train hard and sleep tracking is secondary: the Strap or Strap Pro, which Amazfit built around training loads and live heart-rate broadcast to watches and bike computers.
• You wear a wedding band and will not wear a second ring: the strap, or the Ring 5 if it fits the other hand.
• You are worried about your breathing at night: neither. Use either device's data as notes for a doctor, per the AASM's position.

See the current price at Amazfit for the Helio range, and for the rest of the bedroom gear we rate, see our full shortlist. If a tracker is the start of a bigger overhaul, sleepmaxxing, sorted separates the habits worth copying from the theatre.

FAQ

Does the Oura Ring 4 work without the membership?

Yes, with limits. Oura's membership page says the ring and app "will still function, but the insights, personal health data, and benefits you receive will be much more limited", and that you can export your data as CSV without a membership. New members get the first month free, and the membership can be cancelled from the Membership Hub at any time.

Is the Amazfit Helio Strap discontinued?

Amazfit's US product page was still live with the $99.99 price when checked in October 2026, but the only colour, Black, was marked sold out, and the Helio Ring that many older comparisons discuss no longer appears in Amazfit's US catalogue. The Helio Strap Pro at $199.99 was in stock. Check the listing before assuming either way.

Can either device diagnose a sleep disorder?

No. The AASM's position statement says consumer sleep technology "must be cleared by the Food and Drug Administration (FDA) and rigorously tested if it is intended to diagnose or treat sleep disorders", and that almost no consumer sleep devices have had FDA review. Oura's Nighttime Breathing and Amazfit's Sleep Breathing Quality screens are trend indicators; take the data to a doctor.

Which lasts longer on a charge?

The strap: up to 10 days for the Helio Strap and up to 11 days for the Strap Pro, against 5-8 days for the Oura Ring 4 and up to 6-9 days for the Oura Ring 5, all per the makers' pages.

Does the Helio Strap have a screen or an alarm?

No screen, by design. Amazfit lists a rotor vibration motor, but its product page does not describe a wake-up alarm, so check the Zepp App's current feature list if a silent vibrating alarm is on your wish list; the Oura Ring 4 page does not describe a wake alarm either.

Sources

1. Helio Strap — Amazfit (Zepp Health) (checked October 2026)
2. Helio Strap Pro — Amazfit (Zepp Health) (checked October 2026)
3. Oura Ring 4 — Oura (checked October 2026)
4. Shop Oura Ring — Oura (checked October 2026)
5. Oura Ring 5 (Silver) — Oura (checked October 2026)
6. Oura Membership — Oura (checked October 2026)
7. Consumer sleep technology is no substitute for medical evaluation (AASM position statement) — American Academy of Sleep Medicine (checked October 2026)