Best screen-free sleep tracking band
Garmin CIRQA Smart Band
Garmin's screen-free band with no required subscription and up to 10 days per charge
$199.99
US price, checked
Fitness band
Amazfit Helio Strap
Screen-free $99.99 band with no required subscription and up to 10 days of battery
$99.99US price, checked
Check price at Amazfit for Amazfit Helio Strap Our reviews rest on published sources, not hands-on testing. Our method
Porsche also cofounded Superhuman Chambers, which sells hyperbaric chambers · About the author. This is general information, not medical advice, and no clinician has reviewed it.
The verdict
Amazfit Helio Strap is a $99.99 band with no screen that tracks heart rate, blood oxygen, stress and sleep in the free Zepp app. Amazfit rates the battery at up to 10 days and requires no subscription. The catch is that you read everything in the app and the charging cable isn't in the box. Its heart rate accuracy rests on one reviewer's comparison, not a validation study.
The trade-off
There's no display, no charging cable in the box, and one reviewer saw heart rate readings about 10 bpm high on some long runs.
At a glanceFitness band
- Battery life
- Up to 10 days in typical use, according to Amazfit
- Sensors
- BioTracker 6.0 optical sensor (5 photodiodes and 2 LEDs), accelerometer…
- Health tracking
- Heart rate every second, blood oxygen, stress, sleep stages including REM…
- Training
- More than 50 sports modes, with recognition of 25 strength exercises…
Model reviewed: Black, nylon strap with hook-and-loop closure for 145 to 205 mm wrists
$99.99
Check price at Amazfit US price, checked
No affiliate commission on this link. Check the exact variant before buying.
- Returns 30 days from the purchase date to request a full refund, with a return authorization from Amazfit. See conditions
- Warranty One year from the date of original purchase. See conditions
About this price
Amazfit's US store listed the Helio Strap at $99.99 in US dollars on Oct 20, 2026, with no sale price. Amazfit's free shipping starts at $99, so this price qualifies. The price is before tax. Amazfit also sells a Helio Strap Pro for $199.99, which this review doesn't cover. The Helio Armband for upper-arm wear is a separate accessory, and its price wasn't checked.
$200$400
Related comparisons: Oura Ring 5 vs WHOOP Peak vs Ultrahuman Ring PROWHOOP Peak vs Garmin CIRQA vs Google Fitbit Air
Running costs: WHOOP membership cost and is it worth it? Wearables over 3 years
A GOOD FIT FOR
You want screen-free sleep, heart rate and recovery tracking, or an upper-arm heart rate source, for $99.99 with no required fee.
- You want sleep, heart rate and recovery data from a screen-free strap without a required subscription
- You want to send live heart rate from your upper arm to a watch, bike computer or gym machine
- You want about 10 days between charges (Amazfit's figure) from a 20 g band
- You can buy from Amazfit's own US store, which the warranty requires
THINK TWICE IF
- You want the time, notifications or an on-wrist readout, since it has no display
- You want an ECG or another FDA-cleared feature, since Amazfit makes no such claim and says the band isn't a medical device
- You want readiness insights as deep as WHOOP's, since Amazfit's are shallower
- You want the charging cable in the box, since Amazfit leaves it out
What still needs checking
- Peer-reviewed accuracy data for the Helio Strap's heart rate, HRV, blood oxygen and sleep stages
- Charge time, charger power draw and battery lifespan
- The price of the Helio Armband for upper-arm wear
- How Amazfit handles replacement of a worn-out battery outside the one-year warranty
Does the Amazfit Helio Strap need a subscription?
No. Amazfit says the Helio Strap works with the free Zepp app and has no required monthly subscription1. TechRadar’s reviewer found no subscription is needed for day-to-day use5.
Zepp Aura is the optional paid service. Its free tier has sleep music, guided meditation and one AI sleep assistant message a day4. Premium adds unlimited AI messages, weekly and monthly sleep reports and a larger library4. It costs $11.99 a month or $69.99 a year, after a 14-day free trial4.
Is the Amazfit Helio Strap a good WHOOP alternative?
It costs much less and has no required fee, but WHOOP includes more features16. The Helio Strap is $99.99 once12. WHOOP Peak is $239 a year with the WHOOP 5.0 device included, or $717 over three years if the fee never changes6. Adding Zepp Aura’s annual plan to the Helio Strap would bring three years to $309.964.
Both are screen-free straps. WHOOP rates its battery at 14+ days67, against up to 10 days for the Helio Strap1. Amazfit lists an optical heart rate sensor with accelerometer, gyroscope and temperature sensing1.
TechRadar’s reviewer called the Helio Strap a good lower-cost alternative to a Whoop band, with readiness insights that aren’t as deep5. WHOOP Peak adds Healthspan, a Stress Monitor and Health Monitor alerts6. If you mainly want sleep, heart rate and recovery numbers without a yearly fee, the Helio Strap is the cheaper route1.
The practical details.
| Exact variant | Black, nylon strap with hook-and-loop closure for 145 to 205 mm wrists |
|---|---|
| Battery life | Up to 10 days in typical use, according to Amazfit. That assumes all-day wear with continuous heart rate and blood oxygen tracking. It also assumes 8 hours of sleep breathing monitoring, stress monitoring and three 60-minute workouts a week linked to phone GPS. The battery is 232 mAh, and Amazfit gives no charge time. TechRadar's reviewer had 35% left after a week. |
| Sensors | BioTracker 6.0 optical sensor (5 photodiodes and 2 LEDs), accelerometer, gyroscope and temperature sensor. Bluetooth 5.2. |
| Health tracking | Heart rate every second, blood oxygen, stress, sleep stages including REM, sleep heart rate variability, naps, sleep breathing quality and a sleep score. Also the PAI health score and heart rate recovery. Overnight skin temperature changes are also shown. |
| Training | More than 50 sports modes, with recognition of 25 strength exercises in strength training mode. It stores up to 21 days of heart rate data. It can broadcast live heart rate over Bluetooth to compatible Amazfit and third-party watches, gym machines, bike computers and apps. Workouts sync to Strava, TrainingPeaks (via Terra), adidas Running, komoot, Relive, Google Fit and Apple Health. |
| Display and alerts | No display. You read everything in the Zepp app. Up to 10 vibration alarms, which are weak. |
| Subscription | None required, according to Amazfit. The Zepp app is free. Zepp Aura is optional. Its free tier has sleep music, guided meditation and one message a day to an AI sleep assistant. Premium adds unlimited AI messages, weekly and monthly sleep reports and a larger music and meditation library. It costs $11.99 a month or $69.99 a year after a 14-day free trial. |
| Water resistance | 5 ATM (50 m) under ISO 22810:2010. Amazfit says it suits splashes, showering and swimming. It advises removing the strap for hot showers and saunas, because steam can affect the seal. |
| Wear | Wrist or upper arm. Amazfit says the upper-arm position helps reduce movement interference during hard training. |
| Dimensions | Amazfit lists the tracker at 33.97 x 24.3 x 10.59 mm without the sensor, and 20 g. TechRadar's review gives 20 g with the band. The nylon strap is 22 mm wide and fits wrists from 145 to 205 mm around. The body is fiber-reinforced polymer. |
| Materials | The body is fiber-reinforced polymer, and the strap is nylon with a hook-and-loop closure. TechRadar's review describes the central part as plastic with no metal and says it doesn't feel premium. |
Before you buy
InstallationNo installation
No installation. You pair it with the free Zepp app on an iPhone running iOS 15.0 or later or an Android phone running 7.0 or later. In the box are the strap with the tracker fitted, a magnetic charging head and a manual. Amazfit says the USB-C charging cable isn't included. The packing list has no armband, and Amazfit lists a Helio Armband as a separate accessory.
WarrantyOne year from the date of original purchase, per Amazfit's US warranty policy
One year from the date of original purchase, per Amazfit's US warranty policy. It covers products bought from Amazfit's official US online store, not other sellers. Amazfit repairs or replaces the device at its option, or may refund the purchase price, and you pay to ship it to Amazfit. A repaired or replaced device is covered for the rest of the year or 90 days, whichever is longer. The warranty excludes normal wear and tear, misuse, accidents and use for medical, healthcare or treatment purposes.
Returns30 days from the purchase date to request a full refund…
30 days from the purchase date to request a full refund, with a return authorization from Amazfit. Request the authorization by email or phone within the 30 days, then send the product back in the same condition, with all accessories and original packaging, at your own shipping cost. Amazfit can refuse a return that arrives without an authorization or all parts, or charge a 15% restocking fee or the value of missing accessories, whichever is higher. Orders placed in November and December can be returned through Jan 31 or for 45 days, whichever is longer. Shipping, handling and taxes aren't refundable, and refunds are paid within 4 weeks of Amazfit receiving the product.
More about this assessment
Amazfit Helio Strap is a screen-free band that costs $99.99 on Amazfit's US store. Amazfit says it has no required subscription and rates the battery at up to 10 days. It tracks sleep stages, blood oxygen and stress in the free Zepp app, using an optical heart rate sensor, motion sensors and a temperature sensor. You can wear it on the wrist or the upper arm, and it can broadcast live heart rate over Bluetooth. Zepp Aura, an optional sleep and relaxation service, costs $11.99 a month or $69.99 a year. Amazfit says the band isn't a medical device, and no peer-reviewed accuracy study of it was found.
Strengths on paper
- $99.99 with no required subscription and free shipping
- Up to 10 days per charge, and TechRadar's reviewer had 35% left after a week
- 20 g and rated 5 ATM
- Wrist or upper-arm wear, with live heart rate broadcast over Bluetooth
- A free Zepp app that syncs to Strava, TrainingPeaks, Apple Health and Google Fit
- 30-day returns and a one-year warranty on purchases from Amazfit's US store
Limitations
- No display, so you read everything in the app
- The USB-C charging cable isn't included, and TechRadar calls the small magnetic charging head easy to lose
- Returns cost you shipping, and a 15% restocking fee can apply to a return missing parts or an authorization
- It sometimes overestimated heart rate by about 10 bpm on long runs against a chest strap
- The vibration alarms are weak and the readiness insights are shallower than WHOOP's
- The warranty covers only purchases from Amazfit's official US store
Running costs.
PLAN YOUR OWNERSHIP COSTS
What will it cost to own?
Change the assumptions to fit your use. Leave an unknown cost blank. Add water, subscriptions, cleaning, shipping and taxes if they apply. Use average operating power, not the maximum rating.
3-year known subtotal
$99.99Incomplete: energy use. This is not the full ownership cost.
Energy component: Unknown
Purchase + installation + years × (annual consumables + annual other) + watts/1000 × hours/day × 365 × years × $/kWh. Annualized allowances, not an exact replacement schedule. Excludes taxes, shipping, finance and resale unless entered.Replacement parts & cost assumptions
No scheduled consumable is listed. That doesn’t mean zero maintenance or repair costs.
- Purchase is $99.99, Amazfit's US store price on Oct 23, 2026. With no required fee, the three-year estimate is $99.99 before tax, plus charging energy, which is unknown. You may need your own USB-C cable, because Amazfit doesn't include one.
- Other annual costs are $0 because Amazfit says no subscription is required. Zepp Aura is optional. The annual plan would add $209.97 over three years (3 x $69.99), and the monthly plan $431.64 (36 x $11.99). Neither is counted.
- Amazfit lists no refills or replaceable parts. The Helio Armband is sold separately and isn't counted. Neither are battery wear or an out-of-warranty repair. Amazfit doesn't state the charger's power draw, so energy is unknown.
Evidence & sources.
How accurate are sleep trackers? Our evidence review grades the research as Moderate. That grade is about the claim, not about this product.
- Manufacturer claimBattery, water rating, sensor and size figures are Amazfit's own claims.14 Amazfit says its page data may differ from real performance.
- Manufacturer claimAmazfit says the Helio Strap and the Zepp app aren't medical devices and can't be used for medical purposes or as a basis for diagnosis. It says results are for reference only and that movement and physical characteristics can affect accuracy. Amazfit's pages claim no FDA clearance.1 Amazfit's FAQ also says that for most athletes the upper-arm strap can replace a chest strap. It says the upper-arm position gives more stable readings in training. The page names no study or figures behind that claim.
- Regulator recordFDA's 510(k) database lists no clearance for Zepp, Huami or Amazfit (searched Oct 20, 2026).8 A clearance filed under another company name wouldn't show up.
- Independent testTechRadar's reviewer wore the Helio Strap alongside a chest strap and other trackers. Battery matched the 10-day rating, with 35% left after a week. On long runs the band occasionally overestimated heart rate by around 10 bpm against the chest strap, and in other workouts it was close. Sleep tracking was solid, and the readiness insights lacked WHOOP's depth.5 One reviewer's experience, published Jan 22, 2026, not a peer-reviewed validation study. No independent study of the Helio Strap's heart rate or sleep staging against ECG or polysomnography was found.
Sources (9)
- Helio Strap Amazfit · manufacturer · checked Oct 23, 2026
- Helio Strap US store listing Amazfit · manufacturer · price read from the store’s product data · checked Oct 20, 2026
- Amazfit Warranty & Return Policy Amazfit · manufacturer · checked Oct 20, 2026
- Zepp Aura Amazfit · manufacturer · checked Oct 20, 2026
- Amazfit Helio Strap review TechRadar · independent test · checked Oct 20, 2026
- Join WHOOP WHOOP · manufacturer · checked Oct 20, 2026
- How Long Does WHOOP Battery Last? WHOOP 5.0 and MG Battery Life Explained WHOOP (The Locker) · manufacturer · checked Oct 20, 2026
- FDA 510(k) database search (openFDA): applicants Zepp, Huami and Amazfit US Food and Drug Administration (openFDA) · regulator · data file · checked Oct 20, 2026
- Helio Strap Pro Amazfit · manufacturer · checked Oct 20, 2026
Other options.
Back to our sleep & recovery wearables picks →
Google Fitbit Air
Screen-free $99.99 fitness band with up to 7 days of battery
$99.99
US price, checked
Google Fitbit Charge 6
$159.95 tracker with GPS, an ECG app and 3 months of Premium included
$159.95
US price, checked
About this review. The facts on this page come from manufacturer pages, regulator records and independent tests, checked between Oct 20 and Oct 23, 2026. The sources are listed above.
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