J-Style
J-Style (Shenzhen Youhong Technology Co., Ltd.) is a China-based OEM/ODM manufacturer of smart rings, screenless smart bands, smartwatches, and chronic disease monitors with proprietary AI health algorithms, serving wearable brands, healthcare providers, insurers, and distributors across 100+ countries.
- Company typePrivate
- Founded2004
- HeadquartersShenzhen, China
- Headcount101–250
- GTM typeB2B
- OfferingHardware or Manufacturing
What J-Style does
J-Style (legal name: Shenzhen Youhong Technology Co., Ltd., operating as Jointcorp, Youhong Medical, and Joint Chinese Ltd) is a Shenzhen, China-based OEM/ODM manufacturer of smart wearables founded in 2004. The company designs and produces digital health hardware including the JCRing smart ring series (X1, X2, X3, X5, X6, 2301B), the JCVital screenless smart band series (Aura V10, V8 ECG, V6 4G, V5 AI, V4 Sport, 2208A, 2208, 2318), smart watches with ECG and medical-grade SpO2, and chronic disease monitoring instruments (MFA-1, Smart Sleep Monitor Belt 1657B). It serves B2B customers such as wearable brands, healthcare providers, insurance wellness programs, corporate wellness buyers, distributors, and government health programs across 100+ countries, operating 4 factories in Guangdong Province with claimed 1M+ monthly unit production capacity and a deployed base of 50M+ end users.
The hardware is built on Nordic nRF52840 SoC with BLE 5.0 connectivity, PPG optical sensors, and multi-parameter biometric arrays. Proprietary AI-driven health algorithms include the Blood Glucose Estimation Model (BGEM) for non-invasive metabolic risk screening, BioAge biological age assessment, sleep apnea risk screening, AI Health Insights, and an AI Coach providing personalized wellness guidance. Devices feed into the J-Style Digital Health Monitoring Cloud Platform, which exposes OAuth 2.0-secured REST APIs, SDKs for iOS, Android, and Flutter, and webhook event delivery, with HIPAA-aligned architecture for US healthcare partners and GDPR-compliant data handling for EU deployments.
J-Style operates three commercial models: B2B hardware unit sales, OEM/ODM custom development with 8-16 week lead times, and white-label manufacturing with pilot MOQs from 100 units. Pricing spans $3.50-$8/unit for basic activity trackers, $8-$18 for mid-range fitness bands, $18-$45 for advanced health bands, and $35-$80+ for medical-grade wearables. SDK/API access is offered on Standard (up to 10,000 active users, 1,000 requests/hour) and Enterprise (unlimited users, 10,000 requests/hour, dedicated infrastructure) subscription tiers. The company markets through CES and CMEF trade show presence, earned media coverage (Reuters, ZDNET, Associated Press), and direct enterprise outreach.
J-Style firmographics
Firmographics- Name
- J-Style
- Legal name
- Shenzhen Youhong Technology Co., Ltd.
- Website
- https://jointcorp.com
- Company type
- Private
- Founded year
- 2004
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- J-Style (Shenzhen Youhong Technology Co., Ltd.) is a China-based OEM/ODM manufacturer of smart rings, screenless smart bands, smartwatches, and chronic disease monitors with proprietary AI health algorithms, serving wearable brands, healthcare providers, insurers, and distributors across 100+ countries.
- Ownership category
- akta.pro rank
J-Style industry classification
Industry- Product category
- Smart Wearable Device Manufacturing
- akta.pro primary industry
- Health Monitoring Wearables (ECG, BP, SpO2, CGM-compatible) (CRACAIAF)
- akta.pro secondary industry
- Business Technology & Electronics Wholesale Clubs (B2B) (CRAEAEAF)
Keywords
Where J-Style is headquartered
LocationHeadquarters
- HQ city
- Shenzhen
- HQ country
- China
- HQ region
- Asia
Offices1 record
Markets served
J-Style business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Smart Wearable Hardware Sales: Sale of smart rings, smart bands, smartwatches, and chronic disease monitoring devices to B2B partners including wearable brands, distributors, and enterprise buyers. Revenue generated through OEM/ODM production and white-label manufacturing services.
- OEM/ODM Custom Development: Full-stack OEM/ODM services including industrial design, firmware development, app customization, cloud deployment, and scalable manufacturing from pilot runs to mass production. Revenue from development fees, tooling, and per-unit manufacturing costs.
- White Label Manufacturing: White-label services providing customizable hardware, firmware, app UI, and packaging for rapid market entry. Partners launch own-branded smart wearables using J-Style's existing platforms.
- SDK and API Access: Developer access to iOS, Android, Flutter SDKs and Cloud REST API for platform integrators. Standard tier supports up to 10,000 active users; Enterprise tier supports unlimited users with dedicated infrastructure.
- Digital Health Platform Services: Cloud-based health analytics, AI-driven insights, webhook event delivery, and enterprise dashboard services for fitness, wellness, and medical applications.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Unit Pricing | Multi-year contract | Basic Activity Trackers - Steps, calories, notifications |
| Unit Pricing | Multi-year contract | Mid-range Fitness Bands - HR, sleep, SpO2, notifications |
| Unit Pricing | Multi-year contract | Advanced Health Bands - HR, SpO2, blood pressure, ECG, HRV, temperature |
| Unit Pricing | Multi-year contract | Medical-Grade Wearables - FDA/CE certified ECG, continuous monitoring |
| Subscription | Monthly | SDK/API Platform - Standard Tier |
| Subscription | Annual | SDK/API Platform - Enterprise Tier |
Go-to-market motion3 records
Distribution channels4 records
Marketing channels6 records
J-Style product offering
Product offeringCore offering
J-Style is an OEM/ODM manufacturer of digital health wearables, producing smart rings (JCRing series), screenless smart bands (JCVital series), smart watches, and chronic disease monitoring instruments under its own brand, white-label, and custom development models. Products integrate proprietary AI health algorithms (BGEM blood glucose risk, BioAge, sleep apnea screening, AI Coach) with a HIPAA-aligned Digital Health Monitoring Cloud Platform and SDK/API layer. The company sells exclusively to B2B partners including wearable brands, digital health platforms, healthcare providers, insurance wellness programs, and corporate wellness buyers.
Product overview
J-Style is a digital health wearable platform comprising three hardware product lines: JCRing smart rings (X6, X5, X3, X2, X1, 2301B), JCVital smart bands (Aura V10, V8 ECG, V6 4G, V5 AI, V4 Sport, 2208A, 2208, 2318), and smart watches (2025F ECG, 2051F, 2203, 2113F, 2166, 1963 Medical-Grade), plus chronic disease monitoring devices (MFA-1, Smart Sleep Monitor Belt 1657B). The ecosystem is unified by the Digital Health Monitoring Cloud Platform, companion apps (JCRing, JCVital, JChealth), and SDK/API integration layer. Services include White Label, OEM, and ODM customization. All JCRing models feature 5ATM waterproof protection while JCVital smart bands feature IP68 waterproof protection.
Differentiator
Problem solved
Functional benefit
Brands
- JCRing: Smart ring product line featuring sleep monitoring, HRV analysis, stress insights, and wellness tracking. Includes models X1, X2, X3, X5, and X6 with 5ATM waterproof protection.
- JCVital
- JChealth
Products and services
- JCRing X6 Women's Smart Ring Ultra-thin smart ring designed for women's health management with menstrual cycle prediction, pregnancy health tracking, skin temperature monitoring, and 5ATM waterproof protection. Targeted at OEM/ODM health tech brand partners and wearable brands.
- JCRing X5 Touch Control Smart Ring Smart ring with touch control interface supporting sleep tracking, HRV analysis, and wellness monitoring with 5ATM waterproof protection. Available for OEM/ODM and white-label partnerships.
- JCRing X3 Medical-Grade Smart Ring Medical-grade smart ring with medical SpO2 monitoring, sleep apnea risk assessment, and AI health dialogue capabilities for continuous daily wear. Sold to medical device brands and healthcare platform integrators.
- JCRing X2 Sleep Tracking Smart Ring Sleep-focused smart ring with sleep quality analysis, sleep staging (deep, light, REM, awake), and sleep optimization advice with 5ATM waterproof protection. Available for OEM/ODM partners.
- JCRing X1 Smart Health Ring Broad health monitoring smart ring supporting BGEM blood glucose estimation, family health sharing, heart rate, HRV, sleep, and activity tracking with 5ATM waterproof protection. OEM/ODM/white-label ready.
- JCRing 2301B Fitness Tracker Smart Ring Fitness-focused smart ring for activity tracking, heart rate monitoring, and basic health metrics with fitness tracker functionality. Available to wholesale distributors and brand partners.
- JCVital Aura V10 Smart Bracelet Advanced smart bracelet combining AI-driven health insights including blood glucose risk assessment, biological age analysis, sleep tracking, and 24/7 heart monitoring with IP68 waterproof protection. Sold via OEM/ODM and wholesale channels.
- JCVital V8 ECG Smart Band Medical-grade smart band with on-demand ECG recording, 4-category rhythm classification, and blood glucose estimation model with IP68 waterproof protection. Marketed to medical device partners and health platforms.
- JCVital V6 4G Health Smart Bracelet 4G standalone smart bracelet with GPS, fall detection, and SOS functionality for standalone health monitoring without smartphone dependency. IP68 waterproof. Sold to elderly care programs and telecom partners.
- JCVital V5 AI Health Smart Band AI-powered smart band with full AI health suite including HRV, sleep analysis, stress monitoring, and comprehensive wellness tracking with IP68 waterproof protection. OEM/ODM/white-label ready.
- JCVital V4 Sport HRV Smart Band Sport-focused smart band with VO2 Max measurement, connected GPS, and multiple sport modes for fitness enthusiasts with IP68 waterproof protection. Sold to sports brands and fitness program operators.
- JCVital 2208A Screenless Smart Band Screenless smart band optimized for continuous monitoring with 15+ day battery life and high compliance for long-term health tracking programs with IP68 waterproof protection. Targeted at corporate wellness and insurance programs.
- JCVital 2208 Fitness Tracker Band Entry-level fitness tracker band for step counting, basic heart rate, and activity monitoring with IP68 waterproof protection. Sold at wholesale $3.50-$8.00/unit to distributors and resellers.
- JCVital 2318 Sleep Tracking Bracelet Sleep-focused smart bracelet with sleep tracking, sleep stage analysis, and sleep optimization features with IP68 waterproof protection. Available for OEM/ODM partners.
- 2025F ECG Smart Watch Smart watch with ECG recording capability for cardiac monitoring and health tracking. Sold to health tech brand partners and resellers.
- 1963 Medical-Grade SpO2 Smart Watch Medical-grade smart watch with medical SpO2 monitoring for blood oxygen saturation tracking. Sold at wholesale $35-$80+/unit to medical device brands and healthcare programs.
- MFA-1 Chronic Disease Monitoring Instrument Medical instrument for chronic disease monitoring supporting glucose monitoring, ECG, blood pressure, and long-term disease management. Targeted at healthcare providers and RPM platforms.
- Smart Sleep Monitor Belt 1657B Sleep monitoring belt device for sleep quality analysis and sleep disorder assistance. Sold to medical research institutions and sleep clinic partners.
- J-Style Digital Health Monitoring Cloud Platform Cloud-based digital health platform providing real-time data analytics, AI insights, API/SDK integration, and enterprise-level device management for B2B partners integrating JCRing and JCVital devices.
- Cloud API Cloud REST API enabling partner backend systems to access aggregated health data, AI insights, and device management with OAuth 2.0 authentication and HIPAA-aligned architecture. Sold on Standard ($1,000 req/hour, up to 10K users) and Enterprise ($10,000 req/hour, unlimited users) subscription tiers.
- White Label Manufacturing Service White-label solutions offering customizable hardware, firmware, app UI, and packaging for rapid market entry of branded smart wearables for partners launching own-brand products.
- OEM Services Original Equipment Manufacturer services for custom smart ring, smart band, and health monitoring device development with hardware configuration, firmware features, and branding customization for partner brands.
- ODM Services Original Design Manufacturer services using pre-developed reference designs with customization including appearance, sensor combinations, software features, and algorithm tuning for partner brands.
Quantifiable outcome
- Premium value increased 30% for German health tech company's custom smart ring with blood oxygen, non-invasive blood glucose, and sleep apnea detection
- +3 more outcomes
Companies that use J-Style
Customer profileNamed customers4 records
Segments8 records
Ideal customer profiles4 records
J-Style technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration2 records
AI capability5 records
Feature7 records
J-Style partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- NTT DocomocoreNTT Docomo logo appears in J-Style's trusted partner showcase, indicating a partnership relationship for smart wearable solutions in the Japanese market.
Scale indicators8 records
Recent moves6 records
Expansion highlights6 records
J-Style competitors and assessment
Company assessmentBroad incumbents
- Garmin: Established wearables incumbent with deep health/fitness product lines including ECG-capable watches, SpO2, and stress monitoring. Comparable to J-Style on JCVital smart bands and ECG smart watch offerings in target buyers and sensor scope.
- Quanta Computer: One of the world's largest ODMs, with smart wearable and medical device manufacturing exposure. Comparable to J-Style as an OEM/ODM at greater scale and broader product portfolio across laptops, servers, and wearables.
- Fitbit (Google): Pioneer in consumer fitness bands and now a Google-owned health wearable platform with deep enterprise wellness and insurance partnerships. Comparable to J-Style on smart band form factor, health monitoring features, and B2B corporate wellness GTM.
- Inventec: Taiwanese ODM with wearable, server, and IoT manufacturing capabilities. Comparable to J-Style as an ODM/contract manufacturer serving global brands with vertically integrated hardware-firmware production.
- Samsung Electronics: Galaxy Ring, Galaxy Watch, and broader health ecosystem with FDA-cleared features. Comparable to J-Style as a smart ring and smartwatch competitor with overlapping B2B healthcare and wellness integrations.
Direct peers
- Goertek: Shandong-headquartered Chinese electronics OEM/ODM with deep wearables and hearables manufacturing capabilities, including smart watches, TWS earbuds, and AR/VR. Directly comparable to J-Style as a Chinese OEM/ODM serving global wearable brands with similar PPG/BLE stack and white-label models.
- Compal Electronics: Taiwanese ODM with large-scale smart wearable and connected health device manufacturing for global brands. Comparable to J-Style in serving enterprise OEM/ODM customers with end-to-end hardware + firmware development.
- Oura: Smart ring category leader with direct-to-consumer health monitoring products. Comparable to J-Style on the JCRing product line in form factor, sensor stack (PPG, SpO2, sleep, temperature), and B2B partnerships with insurance and wellness programs.
Emerging players
- Withings: Health-focused wearable and connected device maker with medically-cleared watches, sleep mats, and BPM devices. Comparable to J-Style's medical-grade positioning and B2B healthcare/insurance go-to-market.
- Zepp Health (Amazfit): Chinese-origin smart wearable brand focused on health-monitoring watches and bands with global distribution. Comparable to J-Style on smart band product line and Chinese supply chain roots, though competing more as a brand than an ODM.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks6 records
Key highlights6 records
Customer concentration
J-Style social profiles
Digital presenceJ-Style compliance and trust
Trust signalCompliance7 records
J-Style financial estimates
Financial estimateRevenue estimate
Valuation estimate
J-Style leadership team
Management profileNumber of profiles
J-Style funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
J-Style M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about J-Style
What does J-Style do?
J-Style is an OEM/ODM manufacturer of digital health wearables, producing smart rings (JCRing series), screenless smart bands (JCVital series), smart watches, and chronic disease monitoring instruments under its own brand, white-label, and custom development models. Products integrate proprietary AI health algorithms (BGEM blood glucose risk, BioAge, sleep apnea screening, AI Coach) with a HIPAA-aligned Digital Health Monitoring Cloud Platform and SDK/API layer. The company sells exclusively to B2B partners including wearable brands, digital health platforms, healthcare providers, insurance wellness programs, and corporate wellness buyers.
Is J-Style a public or private company?
J-Style is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was J-Style founded?
J-Style was founded in 2004. It employs 101 to 250 people.
Where is J-Style based?
J-Style is headquartered in Shenzhen, China, in the Asia region.
How does J-Style make money?
Five revenue lines are on record. Smart Wearable Hardware Sales are the primary driver. The others are OEM/ODM Custom Development, white Label Manufacturing, SDK and API Access and digital Health Platform Services.
Who are J-Style's main competitors?
Broad incumbents on record are Garmin, Quanta Computer, Fitbit (Google), Inventec and Samsung Electronics. Direct peers are Goertek, Compal Electronics and Oura. Emerging players are Withings and Zepp Health (Amazfit).
Does J-Style have an API?
Yes. J-Style provides a comprehensive Cloud REST API for aggregated health data access, OAuth 2.0 authentication with JWT (RS256 signed), Webhook event delivery for real-time health alerts, and raw PPG/ECG data access via ODM pathway. Production base URL: https://api.jstyle-health.com/v3. Standard tier: 1,000 requests/hour per client_id; Enterprise tier: 10,000 requests/hour per client_id. Sandbox environment available at api-sandbox.jstyle-health.com. Supports HIPAA BAA for US healthcare partners and GDPR-compliant data handling for EU deployments. Documentation available via SDK & API page (www.jointcorp.com/sdk-api/). Developer documentation is at www.jointcorp.com/sdk-api.
What industry is J-Style in?
J-Style's product category is Smart Wearable Device Manufacturing. Its primary akta.pro industry code is CRACAIAF, Health Monitoring Wearables (ECG, BP, SpO2, CGM-compatible), with a secondary code of CRAEAEAF, Business Technology & Electronics Wholesale Clubs (B2B).