SOXAI RING X is not yet available in your region. The Limited Price Pass is only available in the countries we currently support, but feel free to look around.
SOXAI RING X: the world’s smallest smart ring. Coming to Kickstarter.
Get the $1 Limited Price Pass

Limited quantity. Sales may end without notice.

Please review the Limited Price Pass Terms before purchasing.

COMING SOON

SOXAI RING X is
coming soon to Kickstarter.SOXAI RING X is
coming soon
to Kickstarter.

Our newest smart ring, SOXAI RING X, is launching on Kickstarter soon. Hold a $1 Limited Price Pass, and we’ll invite you to back SOXAI RING X at a price reserved for pass holders when the campaign opens.

Where we are now

Kickstarter project page showing the “Launching soon” status

Our project has passed Kickstarter’s review, and the page is now up as “Launching soon.” Backing will open as soon as we’re ready.

We originally planned to launch in mid-September 2026, and we’re still finalizing the timing. Pass holders will receive an email when the campaign goes live.

ABOUT SOXAI

From SOXAI, Japan’s smart ring brand.

SOXAI RING X is developed, engineered, manufactured and tested in Japan, and after-sales support comes directly from our own team. It is, in every sense, made in Japan.

80,000+ cumulative users
Japan’s No. 1 smart ring app downloads

**Cumulative downloads of smart-ring apps in Japan, Jan 2022–Dec 2024 (App Store and Google Play combined; SOXAI research).

SOXAI RING 2 on display at a major electronics retailer in Japan
On sale at major electronics retailers across Japan.

OUR TRACK RECORD

Three times, the world’s smallest ring.
SOXAI RING X makes it four. Three times, the world’s smallest ring.
SOXAI RING X makes it four.

Since 2022 we’ve designed, manufactured and shipped four generations of smart rings, all in Japan. Three were the world’s smallest at launch.*

  1. SOXAI RING 0

    World’s smallest *

    Crowdfunded for about US$290,000. The world’s first smart ring made in Japan.

    The SOXAI RING 0 crowdfunding page, showing the campaign fully funded.

  2. On general sale

    On general sale in our own store.

    SOXAI RING 0.

  3. SOXAI RING 1

    World’s smallest *

    The second generation.

    SOXAI RING 1.

  4. SOXAI RING 1.1

    Third generation. Longer battery, steadier connection.

    SOXAI RING 1.1.

  5. SOXAI RING 2

    World’s smallest *

    Fourth generation. Also the longest battery in its class.*

    SOXAI RING 2, shown in five finishes.

  6. SOXAI RING X

    World’s smallest *Coming

    Fifth generation. Coming to Kickstarter.

    SOXAI RING X, with its 5.19 mm ring width called out.

*Based on publicly available information from major smart ring manufacturers (SOXAI research). Claims for released products refer to the time of release; the claim for SOXAI RING X reflects information as of August 2026. For SOXAI RING 2, the comparison is among smart rings rated for four days or more of battery life.

Forget you’re wearing it.
That’s the only spec that matters.

Smart rings keep getting smarter. Along the way, we went back to a simpler question: what makes a ring you’ll actually keep on? Nothing else counts if you take it off. SOXAI RING X is 5.19mm wide, the world’s smallest*, small enough that you stop noticing it, with up to 10 days on a charge.

Ring width

World’s smallest* 5.19mm

Max battery
life

10days

*Based on publicly available information from major manufacturers of vital-sensing smart rings (SOXAI research, as of August 2026).

SIZE × BATTERY

“Smaller ring, shorter battery.”
Physics, they said.

Until now, every smart ring asked you to choose. Shrink the ring and you lose battery life. Stretch the battery and the ring gets bulky. Plot every ring on the market and the pattern draws itself. A hard diagonal runs through the field, and nothing crosses it. We call it the size-battery barrier. The industry treated it as a given. SOXAI RING X ends it.

Ring width vs. max battery life. SOXAI RING X achieves 5.19 mm and 7–10 days, above the trend of existing products.Ring width vs. max battery life. SOXAI RING X achieves 5.19 mm and 7–10 days, above the trend of existing products.
Smart ringRing widthMax battery life
SOXAI RING X5.19 mm10 days
Company V5.2 mm3 days
Company O6.09 mm9 days
SOXAI RING 26.7 mm15 days
Company R6.8 mm14 days
Company S7.0 mm7 days
Company C7.8 mm8 days

*Based on publicly available information from major manufacturers of vital-sensing smart rings (SOXAI research, as of August 2026). Battery figures are each manufacturer’s stated maximum.

Asleep or awake,
watching over you 24/7 With the free companion app. No subscription.

Sleep score, sleep stages, steps and stress — plus heart rate, HRV, blood oxygen (SpO2), sleep-apnea tendencies, chronotype and more, all recorded and analyzed. See how you change day to day, and use what you learn to stay on top of your condition.
*Specifications are in development and subject to change.

App screen: sleep score
Sleep scoreSee last night’s sleep quality at a glance.
App screen: sleep stages
Sleep stagesHow deep you slept, and for how long.
App screen: steps
StepsDaily steps, tracked automatically.
App screen: stress monitor
Stress monitorSee how tense or recovered your body is.

HOW IT WORKS

Four steps to your SOXAI RING X

01

Buy the $1 Limited Price Pass

Purchase your pass for $1 on this page.

02

Wait for the launch

Our Kickstarter project is currently in review and coming soon. It will go live once the review is complete and we’re ready to launch. At launch, we’ll email you instructions for backing.

03

Back us on Kickstarter

Back the campaign at the limited price reserved for pass holders.

04

Receive your ring

Delivery timing will be announced when the campaign goes live.

THE PASS

Your $1 buys the right to back at a limited price.

Limited Price Pass $1
The right to back SOXAI RING X
at a limited price below the public campaign price
When the Kickstarter campaign opens, pass holders can back at a limited price below the public campaign price.
Quantities are limited. Sales may close without notice once the cap is reached.
The $1 fee is not refundable and is not credited toward the product price.
You can back the campaign without a pass, but the limited price is available to pass holders only.

FAQ

Frequently asked questions

Not yet. SOXAI RING X is being prepared for its crowdfunding launch and cannot be purchased today. The only thing sold on this page is the $1 Limited Price Pass.
Not if you simply change your mind. We will refund it in specific cases, though: for example, if we decide not to launch the campaign, or if a fault on our side prevents you from backing at the limited price. See the Pass Terms for the full list.
Yes — anyone can back the campaign. However, only pass holders can back at the limited price.
It will be announced when the campaign goes live.
When the campaign opens, we’ll email instructions for backing at the limited price to the address used at purchase. Follow the email and complete your pledge in the browser version of Kickstarter (the limited price cannot be applied in the mobile app).
Yes. SOXAI RING X delivered to Kickstarter backers will come with the companion app in English, and you can select English in the app’s language settings. Support for languages other than English has not been decided yet. We’ll announce it once it is confirmed.
We’d love to serve every region, but we won’t be able to support every country at launch. We plan to decide the supported regions based on where our supporters are, and we’ll announce the details when the campaign goes live.

SOXAI RING X,
at the best price it will ever be.

Get the $1 Limited Price Pass

Limited quantity. Sales may end without notice.

Please review the Limited Price Pass Terms before purchasing.

Get the $1 Limited Price Pass

Limited quantity. Sales may end without notice.