Does the SIMDOO ring need a subscription?

No. Core tracking and notifications work with the free app after a one-time purchase.

Yes, it carries an IP68 rating, so it handles sweat, rain and hand washing. Avoid hot showers and deep diving.

How long does the battery last?

Up to 5 days per charge, and a 30-minute magnetic charge refills it. A portable charging case is included.

How do I pick the right size?

Check the brand's sizing guide before ordering. A snug fit on the index or middle finger gives the most accurate readings.

What comes in the box?

The ring, a charging case, a magnetic charging cable and a manual.

Does it work with iPhone and Android?

Yes, the app runs on iOS and Android and supports 20+ languages.

Where is the SIMDOO Ring for Women Men cheapest?

At Walmart, for $36.98, as of our latest check.

What do buyers say about the SIMDOO Ring for Women Men?

Rated 3.6 out of 5 from 14 ratings.

SIMDOO Ring for Women Men

Best price now

$36.98at WalmartChecked Nov 13

Prices are checked against each store and labelled with when.

Visit Walmart

SIMDOO Ring for Women Men

Best price now

$36.98at WalmartChecked Nov 13

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $36.98 at Walmart on Nov 13.

Our take on the SIMDOO Ring for Women Men

The SIMDOO Smart Ring is a screen-free wearable that tracks activity, sleep and recovery through sensors in a stainless steel band. It is IP68 waterproof, weighs about 5 grams and runs up to 5 days per charge, with a magnetic cable and a portable charging case included. It also pushes call and message notifications through a free iOS/Android app in 20+ languages, with no subscription. Against rivals like Oura and Ultrahuman it is cheaper and subscription-free, but its sensor set and app depth are simpler, and its 3.6-star rating from a small pool of buyers suggests uneven satisfaction.

Best forShoppers who want sleep and activity tracking without a subscriptionPeople who dislike wearing a watch to bedEveryday wear where a light, waterproof ring matters

Pros

No subscription for core features
IP68 waterproof and about 5 g, comfortable for 24/7 wear
Up to 5 days of battery with 30-minute magnetic charging
Portable charging case included for travel
Call and message notifications in 20+ languages

Cons

Small review base, and ratings are middling
Sensors and app are simpler than Oura or Ultrahuman
Sizing must be checked before ordering; a wrong size hurts accuracy
No mention of SpO2, temperature or HRV-grade recovery metrics

SIMDOO Ring for Women Men prices at every store

WalmartNew
In stockSold by Ion LaneReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$36.98Free shippingChecked Nov 13
Visit Walmart

What reviewers say

3.6 / 514 ratings

Only 14 ratings so far, averaging 3.6 out of 5. Buyers who like it cite comfort and the subscription-free basics; others report issues with fit and data reliability.

What people mention

FitCriticisedSome buyers say the ring did not fit as expected, which they link to less reliable readings.
BatteryPraisedOwners report several days of use per charge and quick top-ups.
ComfortPraisedThe light stainless steel band is described as easy to wear overnight.
Data accuracyCriticisedSome users question how closely sleep and activity figures match reality.
AppMixedNotifications work, but the app is seen as basic next to bigger smart ring brands.

About the SIMDOO Ring for Women Men

The SIMDOO Smart Wearable Ring is a screen-free ring that tracks daily patterns such as activity, sleep and recovery. Its sensors collect data to identify trends in each of these areas.

The ring is made of stainless steel and weighs about 5.0 g. It has an IP68 rating, so it is waterproof and built for all-day wear.

Battery life is up to 5 days, and a full charge takes about 30 minutes with the magnetic cable. A portable charging case provides power on the go. The free app, available for iOS and Android in 20+ languages, shows call and message notifications. Core features come with the one-time purchase, with no subscription.

Material: Stainless steel
Color: Black
Ring size: 9
Weight: About 5.0 g
Water resistance: IP68, waterproof
Battery life: Up to 5 days
Charging: Magnetic cable, about 30 minutes; portable charging case
Notifications: Call and message notifications via the app
App: Free; iOS and Android; 20+ languages
Subscription: None required
In the box: 1 x ring, 1 x charging case, 1 x magnetic cable, 1 x manual

Specifications

color: BlackSource
ring_size: 9Source
actual_color: BLACKSource

Questions and answers

Does the SIMDOO ring need a subscription?: No. Core tracking and notifications work with the free app after a one-time purchase.
Is it waterproof?: Yes, it carries an IP68 rating, so it handles sweat, rain and hand washing. Avoid hot showers and deep diving.
How long does the battery last?: Up to 5 days per charge, and a 30-minute magnetic charge refills it. A portable charging case is included.
How do I pick the right size?: Check the brand's sizing guide before ordering. A snug fit on the index or middle finger gives the most accurate readings.
What comes in the box?: The ring, a charging case, a magnetic charging cable and a manual.
Does it work with iPhone and Android?: Yes, the app runs on iOS and Android and supports 20+ languages.
Where is the SIMDOO Ring for Women Men cheapest?: At Walmart, for $36.98, as of our latest check.
What do buyers say about the SIMDOO Ring for Women Men?: Rated 3.6 out of 5 from 14 ratings.