DUCKDiK

DuckDik vs Fitbit Air, Amazfit Helio, Oura and WHOOP

In short: DuckDik Sense plays in the same league as Fitbit Air and Amazfit Helio Strap: screen-free bands at around €90-100. Next to them it costs less (€89), lasts far longer on a charge (up to 45 days) and comes with an AI coach that acts: it builds your training plan inside the app and adjusts it with you, with no subscription. Oura and WHOOP, the high-end references, cost several times more with their fees.

See DuckDik Sense · €89 See Sense Pro · €129.99

A coach that doesn't just advise: it acts

Most apps show you numbers and, at best, a tip. The DuckDik coach talks with you and does things for you inside the app:

It builds your training plan and rebuilds or adjusts it when you ask. You confirm with one tap.
It marks a planned session as done or logs a workout you did without the band.
It suggests a nap, sets your alarm or starts your workout session.
It takes you to the screen you need and suggests pacts and small experiments to improve your sleep or energy.

It's the same kind of coach Google offers on Fitbit Air with Gemini, but there it's part of Google Health Premium, a paid plan. With DuckDik it's included, with no subscription.

The comparison

All are worn without a screen (Oura is a ring) and none has built-in GPS: the route comes from your phone. Data from each brand's official website, checked on 25 September 2026.

	DuckDik Sense	DuckDik Sense Pro	Fitbit Air	Amazfit Helio Strap	Oura Ring 4	WHOOP
Price	€89	€129.99	€99.99	€99.90	From €399	Included in membership
Subscription	No	No	OptionalGoogle Health Premium, 3-month trial	OptionalZepp Aura	Membership€5.99/month or €69.99/year; very limited without it	Requiredfrom €199/year (One)
AI coach that builds your plan	Included	Included	Paidcoach and adaptive plans in Premium	Not stated	In the membershipOura Advisor	In the membershipcoaching
2-year cost	€89	€129.99	€99.99about €289 with Premium after the trial*	€99.90without Zepp Aura	About €539with annual membership	€398two years of WHOOP One
Battery	Up to 45 days	Up to 7 days	Up to 7 days	Up to 10 days	5-8 days	14+ days
Skin temperature	No	Yes, at night	Yesvariation, in the app	Not stated	Yes	Yes
SpO₂	Yesautomatic	Yescontinuous at night	Yes	Yes24 h	Yes	Not stated
Sleep stages	Yes	Yes	Yes	Yes	Yes	Yes
Brand based in	Spain (EU)data on EU servers	Spain (EU)data on EU servers	USA	China	Finland (EU)	USA

* Google publishes the euro price of Health Premium for Italy (€8.99/month); in other countries it's purchased in the app. The 2-year cost with a subscription is our own calculation from official prices: Fitbit Air with 21 months of Premium after the trial, Oura with two years of annual membership (list price €399, no offers). “Not stated” means the official spec sheet doesn't mention it, not that it doesn't exist. DuckDik is not affiliated with any of these brands; they are named for comparison only. Prices may change and offers are frequent.

What really sets them apart

The coach: included or paid. Almost all of them measure the same things. The difference is who helps you understand it and act on it: with Fitbit Air, Oura and WHOOP that coach sits behind a fee. With DuckDik it's included.

How often you charge. The others want the charger every week or every ten days. DuckDik Sense lasts up to 45 days: about eight charges a year.

Women's health. Sense Pro follows your cycle and menopause with night-time temperature and prepares a PDF report to take to your gynaecologist or doctor.

When another one suits you better

Fitbit Air, if you live in the Google world and don't mind paying for Premium to get its Gemini coach.
Amazfit Helio Strap, if you already use an Amazfit watch and want everything in the Zepp app.
Oura, if you prefer a ring to a band and the membership isn't a problem.
WHOOP, if its plans with blood tests or ECG interest you and the annual fee isn't a problem.
DuckDik Sense, if you want to pay once, hardly ever charge it and have a coach that builds your plan and adjusts it with you.
DuckDik Sense Pro, if you also want temperature, night-time breathing or cycle and menopause tracking.

Frequently asked questions

What's the difference between DuckDik and Fitbit Air?

Both are screen-free bands and both have an AI coach that builds your training plan. On Fitbit Air that coach is part of Google Health Premium, which is paid; with DuckDik it's included, with no subscription. DuckDik Sense also costs €89 versus €99.99 and lasts up to 45 days on a charge versus up to 7.

And compared with Amazfit Helio Strap?

Very similar price (€89 versus €99.90) and both work without a subscription. The difference is battery life (up to 45 days versus up to 10) and DuckDik's AI coach, which doesn't just advise: it builds and adjusts your plan inside the app.

What does it really cost over 2 years?

DuckDik: just the band, €89 for Sense or €129.99 for Sense Pro. WHOOP One: €398 for two years of membership. Oura Ring 4: about €539 with two years of annual membership.

Do any of them have built-in GPS?

No. None of the devices compared has built-in GPS: route and distance come from your phone's GPS.

DuckDik is a wellness device, not a medical device: it does not diagnose any disease.

Buy DuckDik Sense · €89 Buy Sense Pro · €129.99

Sources

Fitbit Air, specs · Google Health Premium · Premium price (Google Italy) · Amazfit Helio Strap · Oura Ring 4 · Oura membership · WHOOP membership · WHOOP 5.0 · DuckDik Sense · DuckDik Sense Pro