What Kokoro Mill does

Kokoro Mill (株式会社ココロミル) is a Tokyo-based medical device manufacturer founded in November 2021 that builds wearable patch-type ECG (electrocardiogram) monitoring technology and delivers it through both direct-to-consumer and business-to-institution channels. Its core technology stack consists of miniaturized wireless ECG sensors (the duranta platform) that capture continuous cardiac waveforms for 9 hours to 7 days depending on the application, paired with proprietary analysis algorithms and cloud-based data transmission. The company's consumer-facing service, Home Heart Dock (¥12,100) and the enhanced Home Heart Dock Pro (¥19,800), enables at-home arrhythmia, sleep apnea risk, sleep quality, and autonomic stress screening with PDF reports analyzed by certified clinical laboratory technicians and cardiologists; it sells primarily through its homeheart.health e-commerce site supplemented by SEO-driven health content marketing.

For healthcare institutions, Kokoro Mill offers eclat, Japan's first disposable patch-type Holter ECG device (medical device certification 306AFBZX00067000) capable of up to 7 days of continuous recording and accessed via the eclat WEB portal. A separate veterinary line (duranta for Animals) extends the same ECG platform to companion animals via a 4-day continuous monitoring patch and cloud-based analysis service. The company operates across five customer segments: health-conscious individuals, corporate wellness programs, local government public health initiatives (over 10 municipal co-creation projects), hospitals and clinics, and sports teams, with a referral pathway to online telemedicine through Japan Bridge Cloud Clinic.

Kokoro Mill generates revenue primarily through one-time consumer test purchases, per-test institutional pricing on eclat, veterinary device rental (¥29,700) and analysis fees (¥9,900), and B2B/B2G project contracts. The company holds a Class II Medical Device Manufacturing and Sales License, ISO 13485:2016 certification, and Angel Tax qualification; it raised approximately ¥270 million in Series A funding in September 2023 alongside an earlier pre-Series round and a business-and-capital partnership with Macnica in February 2024. Growth has been driven by successive product launches (2021, 2023, 2025), geographic expansion across Japan, and recognition including J-StarX, JETRO × Berkeley SkyDeck, HVC KYOTO, and B Dash Camp 2026 Pitch Arena finalist status.

Name

Kokoro Mill

Legal name

株式会社ココロミル

Website

https://kokoromil.com

Company type

Private

Founded year

2021

Operating status

Operating

Headcount range

51–100 employees

Short description

Kokoro Mill (株式会社ココロミル) is a Tokyo-based medical device manufacturer that sells wearable patch-type ECG monitors for at-home arrhythmia and sleep apnea screening (Home Heart Dock), disposable Holter ECG devices for hospitals (eclat), and veterinary ECG services, serving consumers, corporations, municipal governments, sports teams, and clinics across Japan.

Ownership category

akta.pro rank

Product category

Cardiac Monitoring Medical Devices

NAICS

Electromedical and Electrotherapeutic Apparatus Manufacturing (334510), Navigational, Measuring, Electromedical, and Control Instruments Manufacturing (33451)

SIC

Electromedical & Electrotherapeutic Apparatus (3845), Surgical & Medical Instruments & Apparatus (3841)

akta.pro primary industry

Cardiac Monitoring (ECG/Holter/Event/Patch, Loop Recorders) (HLAHACAB)

akta.pro secondary industries

Health Monitoring Wearables (ECG, BP, SpO2, CGM-compatible) (CRACAIAF), Remote Diagnostics & Home Testing Devices (Connected POC/At-Home Diagnostic Readers) (HLAHACAL), Cardiology Telemedicine Platforms (HLALAGAB)

Keywords

• Wearable ECG monitoring
• Holter ECG devices
• Cardiac arrhythmia detection
• Home heart testing
• Medical device manufacturing

Headquarters

HQ city

Shinjuku

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Home Heart Dock Pro Product Sales: One-time purchase of ECG testing service with device rental, analysis, and report delivery. Consumer pays upfront for complete testing kit, device use during testing period, and professional analysis. Device returned via prepaid envelope after testing.
2. Home Heart Dock Product Sales: Standard Home Heart Dock service for arrhythmia detection only at lower price point than Pro version.
3. eclat Medical Institution Services: Disposable Holter ECG devices sold to healthcare institutions (hospitals, clinics). Includes device cost plus analysis service by company cardiologists and clinical technicians. Revenue-generating per-test model for medical facilities.
4. Veterinary ECG Analysis Services: Single-use rental of veterinary ECG device (¥29,700 per rental period) plus analysis support service (¥9,900 per analysis). Services offered to animal hospitals for pet cardiac monitoring.
5. Corporate Wellness Programs: B2B sales of Home Heart Dock Pro services to companies for employee health management. Volume pricing for corporate wellness and health management initiatives.
6. Government Health Projects: Contracts with local government municipalities for public health demonstration projects. Regional healthcare initiatives and community health promotion programs funded by municipal governments.

Pricing tiers

Go-to-market motion5 records

Distribution channels6 records

Marketing channels9 records

Core offering

Kokoro Mill designs, manufactures, and sells wearable ECG (electrocardiogram) medical devices and cloud-connected cardiac monitoring services. Its product portfolio includes the Home Heart Dock and Home Heart Dock Pro consumer-facing home ECG testing services (with devices shipped to users for self-administered 9-24 hour monitoring, followed by analysis by clinical laboratory technicians and cardiologists), the eclat disposable patch-type Holter ECG for hospitals and clinics, and the duranta wearable ECG for veterinary use. The company also operates the eclat WEB portal for healthcare providers to access analysis reports.

Product overview

株式会社ココロミル operates as a medical device manufacturer offering a portfolio of home and clinical ECG monitoring services. The core offering consists of two tiers of consumer-facing home cardiac check-up services: ホーム心臓ドック® for arrhythmia detection, and the enhanced ホーム心臓ドックpro which adds sleep apnea syndrome (SAS) risk, sleep quality, and stress analysis from a single wearable ECG session. For healthcare institutions, the company provides eclat, Japan's first disposable patch-type Holter ECG device with up to 7-day monitoring and bundled analysis services. The technology platform extends to veterinary medicine via the duranta animal wearable ECG device with paid analysis support. All services share a common technology stack: precision wearable ECG sensors originally developed for hospital use, cloud-based ECG data transmission, and analysis by cardiovascular specialists and clinical laboratory technicians, unified under the company's quality management system certified to ISO 13485:2016.

Differentiator

Problem solved

Functional benefit

Brands

• ホーム心臓ドック®: 自宅で長時間心電図検査ができるサービス。不整脈、睡眠時無呼吸症候群、睡眠の質、ストレスを可視化する。
• ホーム心臓ドックpro
• eclat（エクラ）
• duranta
• kokolog MD
• 動物医療（ペット向けホルター心電図）
• kokoromilオンライン外来

Products and services

• Home Heart Dock (ホーム心臓ドック®) Home-based long-duration ECG monitoring service for individual consumers. Users receive a compact wireless ECG sensor by mail, wear it for 9+ hours (typically overnight), and return the device. ECG data is analyzed by clinical laboratory technicians and cardiovascular specialists, with a PDF report delivered in approximately one week. Detects arrhythmias missed by short health check-up ECGs.
• Home Heart Dock Pro (ホーム心臓ドックpro) Enhanced consumer home ECG testing service providing comprehensive multi-parameter analysis in a single test: arrhythmia detection, sleep apnea syndrome (SAS) risk assessment, sleep quality indicators, and autonomic stress levels. Uses the same precision wearable ECG device with analysis by cardiologists and clinical laboratory technicians.
• eclat Disposable Holter ECG (eclat 使い切りホルター心電計) Japan's first disposable (single-use) patch-type Holter ECG device sold to healthcare providers and medical institutions. Records ECG continuously for up to 7 days, IPX5 dust/water resistant, Class II medical device (cert. 306AFBZX00067000). ECG analysis performed by company cardiologists and clinical laboratory technicians, with results accessible via the eclat WEB portal.
• duranta Veterinary Wearable ECG (duranta 動物用ウェアラブル心電計) Wearable ECG device adapted from the company's human medical technology for veterinary use in dogs and cats. A wireless patch is attached to the animal's chest for up to 4 days of continuous monitoring. ECG data is transmitted to cloud servers via a companion iPhone app. Detects arrhythmias that only manifest during normal daily activity or sleep in pets.
• Veterinary Holter ECG Analysis Support (動物向けホルター分析支援)

Quantifiable outcome

• 36% arrhythmia detection rate vs 10% for standard health check-up ECG tests
• +5 more outcomes

Named customers12 records

Segments7 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration3 records

AI capability2 records

Feature6 records

Partnerships

15 partnerships are on record, tiered major and minor.

• Tomigusuku City, Okinawa (豊見城市)majorStrategic or Co-development Partner · 1 April 2026Municipal government partnership for 'Early Medical Consultation Model' demonstration project targeting city hall employees. Project combined smartphone heart scan apps with Home Heart Dock Pro detailed testing. Collaboration with Okinawa Prefecture test bed support program.
• Medinet (メディネット)minorStrategic or Co-development Partner · 27 March 2026Joint research on 'preemptive medicine' clinical studies. Research on correlation between immune cell therapy and stress/sleep using ECG data.
• Kokuyo Nagoya (コクヨ名古屋)majorStrategic or Co-development Partner · 13 March 2026Joint demonstration project 'Office Well-Being Project to Protect Workers' as part of Nagoya City Lab initiative. Kokuyo provided workspace and employee participants for 24-hour cardiac monitoring using Kokoromiru's kokolog MD wearable device. Project identified hidden heart disease risks in 48% of office workers.
• Saishunkan Co-Creation Laboratory (さいしゅんかん共創研究室)minorGTM or Marketing Partner · 6 March 2026Positive Age Fes 2026 wellness festival in Kumamoto showcasing Home Heart Dock Pro. Event targeting Kumamoto Prefecture well-being advanced prefecture designation for regional revitalization.
• Toin Gakuen Rugby Club (桐蔭学園ラグビー部)majorChannel Partner/ Reseller/ Distributor · 1 November 2025High school rugby club implementing Home Heart Dock Pro as standard pre-enrollment cardiac screening. Pilot test with 22 players found cardiac risks. Moving toward 100-player full team screening.
• Yokose Town (横瀬町)majorStrategic or Co-development Partner · 1 December 2024Municipal partnership through 'Yokorab' platform for cardiac risk early detection and care prevention project. Target of approximately 80 residents aged 50-70 for bi-annual ECG testing to prevent bedridden conditions and reduce care-related work absences.
• Yoshiki Town, Nara Prefecture (磯城郡三宅町)minorStrategic or Co-development Partner · 1 May 2024Comprehensive cooperation agreement for citizen health literacy improvement. Municipal health promotion initiative using Home Heart Dock services.
• Japan Bridge Cloud Clinic (日本橋クラウドclides)majorImplementation/ SI/ Consulting Partner · 1 May 2024Online clinic partnership providing telemedicine consultations based on Home Heart Dock test results. Clinic offers specialist referrals and treatment guidance for customers with abnormal findings. Ensures seamless medical consultation pathway.
• Shonan Bellmare (湘南ベルマーレ)minorChannel Partner/ Reseller/ Distributor · 1 May 2024J.League soccer team adoption of Home Heart Dock for player health management. Pioneering health management initiative in Japanese professional sports.
• Yokohama Elderly Citizens Association (横浜市老人クラブ連合会)minorGTM or Marketing Partner · 1 April 2024Health lecture collaboration on arrhythmia and heart disease risk for Yokohama citizens aged 60+. 30 participants received Home Heart Dock demonstrations.
• Kanagawa VANGUARDS (神奈川ヴァンダガード)minorChannel Partner/ Reseller/ Distributor · 1 March 2024Wheelchair basketball team medical check-up partnership using Home Heart Dock. Health management for Paralympic athletes.
• TOKYO DIMEminorChannel Partner/ Reseller/ Distributor · 1 March 20243x3 professional basketball team medical check-up partnership. Player health monitoring and performance optimization program.
• McAnika (マクニカ)majorTechnology or Integration · 1 February 2024Business and capital partnership for technology integration and market expansion. McAnika's IoT and electronics distribution expertise combined with Kokoromiru's cardiac monitoring technology.
• Tokyo Medical and Dental University, Nine Hours (東京医科歯科大学、ナインアワーズ)minorStrategic or Co-development Partner · 1 September 2023Joint research using sleep data from capsule hotel guests to establish arrhythmia detection methods. Research collaboration on sleep patterns and cardiac health.
• Azabu University, Toyobo, Toyobo STC (麻布大学、東洋紡、東洋紡STC)minorStrategic or Co-development Partner · 1 April 2023Joint research for early detection of heart and respiratory diseases in dogs and cats using home-use biological monitoring devices. Veterinary application development partnership.

Scale indicators10 records

Recent moves10 records

Expansion highlights6 records

Direct peers

• iRhythm Technologies: US-based company behind the Zio suite of long-term cardiac monitoring patch services, the closest global analog to Kokoro Mill's eclat disposable Holter and Home Heart Dock concepts. Both companies deploy lightweight patch ECG recorders combined with proprietary arrhythmia-detection analytics, but iRhythm operates at much greater scale with FDA-cleared 14-day continuous monitoring and established US reimbursement infrastructure.
• AliveCor: Maker of KardiaMobile consumer/clinical ECG devices with AI-driven arrhythmia detection. Directly comparable to Kokoro Mill's Home Heart Dock in combining consumer-friendly ECG hardware with cloud-based AI analysis, though AliveCor focuses on single-lead spot readings rather than long-duration monitoring.
• Omron Healthcare: Japan-headquartered global leader in consumer health monitoring including ECG-equipped blood pressure monitors and wearable devices. Comparable to Kokoro Mill in serving Japanese consumers seeking at-home cardiac monitoring, but with vastly greater scale, retail distribution, and brand recognition.

Broad incumbents

• Philips (BioTel Heart): Philips BioTel Heart offers a portfolio of cardiac monitoring services including MCOT (Mobile Cardiac Outpatient Telemetry) patch and Holter. Relevant comparable for eclat's medical-institution channel, though Philips operates across many clinical and hospital segments beyond cardiology.
• GE Healthcare: Global medical device giant with ECG and patient monitoring products relevant to Kokoro Mill's medical-institution strategy. GE's prior employment of Kokoro Mill's CTO (at GE Yokogawa Medical Systems) creates a direct technology lineage and competitive overlap in diagnostic cardiology.
• Preventice Solutions (Boston Scientific): Boston Scientific-owned remote cardiac monitoring services including BodyGuardian and ECG patch solutions. Comparable in deploying patch-based ECG monitoring with analytics, but operates at much larger scale under Boston Scientific's commercial infrastructure.
• Apple (Apple Watch ECG): Apple Watch's ECG app and irregular rhythm notifications represent the most direct consumer-DTC ECG competitive threat globally. While Apple Watch ECG is single-lead and intermittent, its installed base among Japanese consumers could compress Home Heart Dock's DTC addressable market for users seeking spot ECG rather than long-duration monitoring.

Regional players

• Fukuda Denshi: Japan-domestic ECG and patient monitoring manufacturer with deep relationships across Japanese cardiology departments. Comparable to eclat as a Japanese-Holter-ECG competitor with established hospital sales channels, though Fukuda Denshi's portfolio is centered on traditional reusable Holter devices rather than disposable patches.

Emerging players

• VitalConnect: US-based maker of the VitalPatch wearable biosensor for continuous cardiac and multi-parameter monitoring in hospital and remote settings. Comparable technology platform (wearable patch + cloud analytics) though targeting acute care/hospital discharge rather than Kokoro Mill's preventive screening positioning.
• Qardio: Consumer health device company offering QardioCore ECG monitor and related cardiac health products. Comparable in the consumer-DTC ECG space and partnership-driven distribution model, though primarily focused on European/US markets rather than Japan.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks7 records

Key highlights7 records

Customer concentration

• Xx.com/kokoromil_

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

Funding overview

Funding rounds3 records

Investors6 records

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 Kokoro Mill