WHOOP made the screenless wristband famous, and Amazfit's Helio Strap undercut it on price with no subscription at all. Both show up constantly when parents search for a sleep tracker without a screen, and both were designed for adults who train.
So the useful question is not which of the two is better. It is whether either belongs on a child, and what you give up if you choose the one that was built for children instead.
The three bands side by side
| Halo LyttFor children 6+ | WHOOP 5.0Members 13+ | Amazfit Helio StrapAge not stated | |
|---|---|---|---|
| Screen | None | None | None |
| Battery | 30+ days | 14+ days | Up to 10 days |
| Weight | 22 g | Not published | 20 g |
| Subscription | None | Paid membership required | None |
| Data goes to | The parent | The wearer | The wearer |
| Price | AED 699 | Included in membership | $99.99 |
Sources, last checked September 2026. Helio Strap price, battery, weight, 5 ATM water rating and no-subscription policy from Amazfit's product page. WHOOP 5.0 battery from WHOOP's support documentation, and the minimum member age of 13 from WHOOP's terms of use. WHOOP sells the band as part of a yearly membership with several tiers; check WHOOP directly for current prices, which we have not quoted here because published figures vary. Halo Lytt specifications from the manufacturer. The Helio Strap's price converts to roughly AED 367 at the pegged rate of 3.6725, before UAE duty, VAT and retailer margin.
Where WHOOP and Amazfit are genuinely stronger
Start with the honest part, because two of these rows do not favour Halo Lytt.
The Helio Strap is cheaper and slightly lighter. At $99.99 and 20 grams with no subscription, it is the best value screenless band here for an adult. It measures continuous heart rate, HRV, sleep stages, blood oxygen, stress, recovery, training load and VO2 max, with more than 50 sports modes.
WHOOP has the most established recovery and strain model of the three, and a mature coaching app built around it. If you are an adult who trains seriously and wants to be told how hard to push each day, that is what the membership pays for.
Neither of those strengths is about children, and that is the whole point of the rest of this comparison.
The question that decides it: who sees the data?
On WHOOP and on the Helio Strap, the data belongs to the wearer. It lives in the WHOOP app or Amazfit's Zepp app, on an account for the person wearing the band.
For a teenager who wants their own training data, that is fine. For a seven year old it creates the awkward choice every adult band creates: give the child a phone and a fitness account, or run their account from your own phone and mix it up with yours. There is no parent view because neither product needs one.
Halo Lytt is built the other way round. The child wears the sensor and sees nothing. Every child in the family shows up in one parent app, and two parents on separate phones can both see the same data.
Age limits are not a technicality
WHOOP's terms require members to be at least 13, with parental consent where a child is too young to agree to a contract. Some WHOOP features go further: its healthspan feature is not available under 18, and heart rhythm features are not intended for anyone under 22. Amazfit does not state an age for the Helio Strap at all.
Halo Lytt is designed for children from 6 up. For a primary-age child that difference is the entire decision, before any spec comes into it.
Adult metrics on a child's wrist
Training load, strain targets and VO2 max are useful to an adult with a race on the calendar. For a nine year old they are numbers without a decision attached, and a daily strain goal is exactly the kind of score parents trying to reduce screens are trying to keep away from their children.
A band for children should measure what changes a household: when sleep actually starts, night waking, consistency, recovery and stress. Halo Lytt tracks sleep, recovery, stress, activity, heart rate, breathing and skin temperature, and stops there on purpose.
Battery decides whether sleep gets measured
Ten days and fourteen days are good numbers. Thirty is a different routine. A band that needs charging every week or two will sooner or later be on the charger at bedtime, and a band on a charger is not measuring the one thing most parents buy it for. At 30 or more days, Halo Lytt is charged about once a month.
So which should you buy?
Buy Halo Lytt if the wearer is a child aged 6 or older, you want sleep and wellbeing data in a parent app rather than on the child's wrist, and you would rather charge it monthly.
Buy the Amazfit Helio Strap if the wearer is an adult who wants a screenless band at the lowest price with no subscription.
Buy WHOOP if the wearer is an adult or older teenager who trains seriously and values coaching enough to pay for membership every year.
Buy none of the three if you need to locate or contact your child. None of them does that. You need a connected GPS smartwatch with its own SIM, and you should expect a monthly fee.
What Halo Lytt is
A 22 gram screen-free health band for ages 6 and up, built by two engineer parents, Unmesh Shah and Nikhil Nagraj. It runs 30 or more days per charge, is waterproof to 50 metres, and is CE, FCC and RoHS certified. It tracks sleep, recovery, stress, activity, heart rate, breathing and skin temperature into one parent app that works across separate phones. Data sits on servers in Ireland under EU data protection law, encrypted in transit and at rest, never sold to advertisers. AED 699 in the UAE, free delivery, 14 day returns, no subscription.
It has no screen, no camera, no calling, no messaging, no games, no SIM, and no GPS or location tracking.
Halo Lytt's metrics are for wellbeing awareness. They are not clinically validated, and it is not a medical device.
If you are also weighing Garmin and Polar, read Garmin CIRQA vs Polar Loop vs Halo Lytt. For how to read sleep numbers well, see what a kids sleep tracker actually tells you. The band is on the Halo Lytt product page.
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