Circular Ring

What Circular Ring does

Circular is a Paris-origin consumer health-technology company founded in 2019 that designs and sells the Circular Ring 2, a premium titanium (2-gram) smart ring positioned as the "world's first" consumer ring with ECG-based AFib detection. The hardware integrates PPG biosensors (heart rate, HRV, SpO2, temperature), single-lead ECG, GPS, and battery-management firmware, connecting to a companion mobile app where Kira, an AI health coach, analyzes over 140 daily biomarkers to produce predictive and actionable wellness recommendations across sleep, energy, stress, sport, women's health, and cardiac rhythm.

The business model is direct-to-consumer hardware: the Circular Ring 2 sells at $349 USD as a one-time purchase with no subscription for core features, supplemented by accessories (charger, USB-C cable, sizing kit, blue-light glasses, sleep mask) and a referral/affiliate program. Go-to-market combines a record-breaking Kickstarter launch, organic social, tier-1 press (CNET, Forbes, Android Authority, T3, Wareable CES 2025 Best in Show), and athlete brand ambassadorships (Romain Grosjean, Clint Capela). Primary customers are health-conscious consumers in Europe, North America, and APAC, with a secondary B2B push via a /professionals corporate-wellness page.

The company faces material operational uncertainty: the French entity (Circular Health Limited, SIREN 990 900 326) entered liquidation in February 2026, while the company publicly states it has restructured and relocated to Hong Kong, with leadership (Chair/CEO Amaury Kosman, COO Laurent Bsalis, CTO Adiasa Suharno) and ongoing product development through mid-2026.

Name

Circular Ring

Legal name

Circular Health Limited

Website

https://circular.xyz

Company type

Private

Founded year

2019

Operating status

Operating

Headcount range

11–50 employees

Short description

Circular is a Paris-founded (2019) smart-ring company selling the ECG/AFib-capable Circular Ring 2 at $349 with no subscription, using Kira AI to analyze 140+ biomarkers for health-conscious consumers globally, now operating from Hong Kong after its French entity's 2026 liquidation.

Ownership category

akta.pro rank

Product category

Wearable Health Devices

NAICS

Electromedical and Electrotherapeutic Apparatus Manufacturing (334510)

SIC

Electromedical & Electrotherapeutic Apparatus (3845)

akta.pro primary industry

Smart Rings (CRACAIAC)

akta.pro secondary industries

ECG/EKG & Heart Rhythm Monitors (Consumer) (CRACAQAC), Sleep Tracking Devices (Wearables & Non-wearables) (CRACAQAD), Smart Fitness & Training Devices (Connected Fitness Sensors, Smart Jump Ropes, etc.) (CRACAQAH)

Keywords

• Smart health ring
• Wearable health tracker
• ECG smart ring
• AFib detection ring
• Biometric monitoring device

Headquarters

HQ city

Paris

HQ country

France

HQ region

Europe

Offices2 records

Markets served

GTM type

B2C

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Technology or R&D, Marketing or Sales, Infrastructure, Personnel, Operations

Revenue model

1. Smart Ring Hardware Sales: The primary revenue stream is the sale of Circular Ring 2 hardware. The ring is sold at $349 USD as a one-time purchase with no subscription required for core features. Accessories (charger, USB-C cable, sizing kit, glasses, sleep mask) are sold separately.
2. Subscription Services: Circular may offer additional services with a subscription model, including access to certain premium content, software, monthly product deliveries, or other insurance products. The subscription policy describes auto-renewal with cancellation preventing future charges but no refunds for unused portions.
3. Accessories and Consumables: Revenue is also generated from complementary products including the Circular Charger, USB-C Cable, Sizing Kit, blue-light blocking Glasses, and Sleep Mask, sold as separate line items in the shop.
4. Referral Program (Circular Coins): The Circular Coins program rewards users with benefits after purchasing, redeemable for discounts on future purchases. Referrers earn promotional codes after full payment and no returns within the withdrawal period.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels8 records

Core offering

Circular Ring designs, manufactures and sells the Circular Ring 2, a premium titanium smart ring that combines ECG-based irregular heart rhythm (AFib) detection with continuous tracking of heart rate, HRV, SpO2, temperature, sleep, stress, activity and women's health via a companion app powered by the Kira AI health coach. The product is sold direct-to-consumer as a one-time $349 purchase with no subscription, supported by accessories such as a charger, USB-C cable, sizing kit, sleep mask and blue-light blocking glasses.

Product overview

Circular Ring is a smart ring company offering the Circular Ring 2 as its core hardware product—a premium titanium smart ring with ECG-based AFib detection, positioned as the 'World's First ECG and AFib Detection Ring.' The product ecosystem centers on the Circular Ring 2 paired with the Circular App, which features Kira, an AI-powered personal health coach analyzing 140+ biomarkers for personalized wellness recommendations. The Circular Ring 2 is complemented by accessories including the Circular Charger, USB-C Cable, Sizing Kit, Sleep Mask, and Blue Light Blocking Glasses. The platform offers 13+ health tracking features (circles) including sleep analysis, energy scoring, stress monitoring, heart rhythm monitoring, sport sessions, women's health, and more—all without a subscription model. New features are delivered via over-the-air firmware and app updates.

Differentiator

Problem solved

Functional benefit

Products and services

• Circular Ring 2 Premium titanium (2g) smart ring for individual consumers offering ECG-based irregular heart rhythm analysis, AFib detection, sleep staging, activity tracking, stress and women's health monitoring across 13+ health circles without requiring a subscription.
• Circular App Companion iOS and Android app for Circular Ring users that displays synced biometric data, presents 13+ health 'circles', delivers Kira AI health coaching and manages ring settings and firmware updates.
• Kira AI Health Coach AI-powered personal health coach embedded in the Circular App that analyzes 140+ daily biomarkers to deliver real-time, science-backed health recommendations and actionable insights.
• Circular Glasses (Blue Light Blocking) Blue light blocking glasses sold as a complement to the Circular Ring 2, intended to support sleep quality and reduce digital eye strain.
• Circular Sleep Mask Sleep mask accessory designed to enhance sleep quality and complement the sleep tracking capabilities of the Circular Ring 2.
• Circular Charger Charging case for the Circular Ring 2 that powers the ring and supports soft reset and factory reset functions.
• USB-C Cable Replacement USB-C charging cable used with the Circular Ring 2 charging case.
• Sizing Kit Smartphone-enabled sizing kit that lets buyers determine their precise ring size at home before ordering a Circular Ring 2.

Quantifiable outcome

• 94% sleep/wake detection accuracy against PSG (polysomnography)
• +2 more outcomes

Named customers2 records

Segments2 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration5 records

AI capability5 records

Feature9 records

Partnerships

Twelve partnerships are on record, tiered core, flagship and minor.

• Apple Health (HealthKit)coreTechnology or IntegrationCircular Ring integrates bidirectionally with Apple HealthKit, allowing users to sync their health data both ways. Sport sessions, sleep data, heart rate, steps, distance, skin temperature, and other metrics can be synced to Apple Health. Health Connect permissions policy and Limited Use requirements are adhered to.
• Google Health ConnectcoreTechnology or IntegrationCircular Ring integrates with Google Health Connect for Android users, syncing intra-day data including temperature, SpO2, breathing rate, ECG, and other vitals. Google's API Services User Data Policy and Limited Use requirements are followed. Previously integrated with Google Fit which is now deprecated.
• Romain GrosjeanflagshipGTM or Marketing PartnerINDYCAR driver Romain Grosjean serves as a brand ambassador for Circular, featuring in promotional materials and video content showcasing the ring's health tracking capabilities for athletic performance monitoring.
• Clint CapelaflagshipGTM or Marketing PartnerNBA player Clint Capela is a brand ambassador for Circular, appearing in promotional materials highlighting the ring's role in tracking athletic performance and recovery.
• KickstartercoreChannel Partner/ Reseller/ DistributorCircular launched its Circular Ring 2 via a record-breaking Kickstarter campaign, using the platform for pre-order sales, crowdfunding, and community building at launch.
• RouteminorOthersCircular partners with Route, an optional package protection and tracking solution that allows customers to protect their orders against loss, theft, or damage during transit. Route also provides a mobile app for tracking all online orders.
• Amazon Web Services (AWS)coreTechnology or IntegrationCircular uses Amazon Web Services located in the Paris region (France) as its primary cloud service provider for data storage, disaster recovery, and service delivery. AWS infrastructure supports the Circular backend API and ring firmware.
• WiLDSECOPS SASminorOthersWiLDSECOPS SAS performed a whitebox security assessment and code review against the Circular Backend API and Circular Ring Firmware between July 2021 and January 2022, identifying and resolving security weaknesses.
• WSO (Web Security Organization)minorOthersWSO reviewed security components of the Circular Backend handling user authentication, registration, ring registration, and health data upload, which may be subject to HIPAA regulation.
• ShopifycoreTechnology or IntegrationCircular's store is hosted on Shopify Inc., which provides the online e-commerce platform enabling the company to sell products directly to consumers. Payment processing uses Shopify Payments and Shop Pay.
• StripecoreTechnology or IntegrationStripe is used as a payment processor for credit/debit card transactions on the Circular platform.
• AwinminorGTM or Marketing PartnerCircular operates an affiliate program for publishers through Awin (ui.awin.com/express-signup), enabling content publishers to earn commissions by driving traffic and sales to Circular.

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Oura: Oura is the dominant smart ring player, offering health, sleep, and readiness tracking. It is the most direct competitor to Circular Ring 2, sharing the same form factor, target customer (health-conscious consumers), and DTC premium-pricing model.
• Ultrahuman: Ultrahuman sells the Ring Air smart ring focused on sleep, activity, and metabolic health, plus a broader wearables ecosystem. It is a direct peer with comparable target customers and similar subscription vs. one-time-purchase positioning.
• Whoop: Whoop is a wrist-worn continuous health and recovery tracker focused on athletes. While wrist-based rather than ring-based, it competes for the same health-conscious/performance customer and includes sleep, strain, HRV, and recovery metrics analogous to Circular's 'circles.'
• Withings: Withings offers connected health devices including ECG-enabled ScanWatch and BeamO, sharing Circular's positioning at the intersection of consumer wearables and clinical-grade cardiac monitoring. Comparable focus on ECG, sleep, and health-data integration.

Broad incumbents

• Samsung (Galaxy Ring): Samsung's Galaxy Ring competes directly with Circular in the smart ring category, leveraging Samsung's global retail distribution and ecosystem integration. It is a broad incumbent rather than a pure-play startup.
• Amazfit (Helio Ring): Amazfit's Helio Ring is a sleep-and-recovery-focused smart ring from a broader wearables incumbent. Comparable form factor and target use case, backed by wider product distribution.
• Fitbit (Google): Fitbit is a broad incumbent in consumer health wearables with strong brand recognition and integration into Google Health. It overlaps with Circular on sleep, heart rate, and activity tracking but lacks the ring form factor.
• Apple (Apple Watch): Apple Watch offers FDA-cleared ECG and AFib detection in a wrist-worn form factor and is the de facto benchmark for consumer cardiac monitoring. It is a broad incumbent with massive distribution and ecosystem lock-in that competes for Circular's target buyer.
• Garmin: Garmin provides a broad portfolio of fitness and health wearables (watches, cycling computers) with advanced biometrics for endurance athletes. Comparable overlap in sport/recovery tracking and partnership with athletes, though primarily wrist-worn.

Emerging players

• RingConn: RingConn is an emerging smart ring brand offering sleep, activity, and SpO2 tracking with a subscription-free model. It is a direct emerging competitor in the affordable smart ring category.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/circularing
• YouTubeyoutube.com/@circular-ring
• Facebookfacebook.com/circularing
• Instagraminstagram.com/circularing
• TikToktiktok.com/@circularing
• LinkedInlinkedin.com/company/circularing

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds6 records

Investors1 record

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Circular Ring