VentriJect

What VentriJect does

VentriJect is a Danish medical device company founded in 2018 as a spin-out from Aalborg University's cardiology research center. The company develops and commercializes the Seismofit® System, which estimates cardiorespiratory fitness (VO2max) in under three minutes without requiring physical exertion, using a chest-mounted accelerometer sensor that captures seismocardiographic vibrations and a proprietary AI algorithm that converts the signal into a VO2max score. The system comprises four components — the Seismofit Sensor (3 cm x 5 cm x 1.5 cm, 25 g), the Seismofit Patch (single-use adhesive fixation), the Seismofit App (iOS and Android, available in Clinical and Wellness variants), and the cloud-based Seismofit Algorithm. The technology is CE-marked as a Class 1 medical device in the EU and classified as a General Wellness device by the FDA for the US market.

The company sells primarily to healthcare providers, corporate wellness programs, sports medicine practitioners, and academic researchers, with a hybrid revenue model combining one-time hardware sales and an annual subscription for ongoing VO2max estimations. Distribution is via direct enterprise sales and a growing channel partner network that includes Siemens, TIGRA, AG Sundhedsfremme, Median Kliniken, and others across Europe. In December 2025, VentriJect entered the US market through a partnership with EHE Health, marking a transition from a European clinical-research footprint to a transatlantic commercial business. The company is privately held, employs 1-10 people, has raised approximately €3.6 million across two funding rounds (2021 and August 2025), and is led by CEO Mikkel Kristiansen alongside four co-founders spanning cardiology, biomedical engineering, and operations.

Name

VentriJect

Legal name

VentriJect

Website

https://ventriject.com

Company type

Private

Founded year

2018

Operating status

Operating

Headcount range

1–10 employees

Short description

VentriJect is a Danish medical device company that sells the Seismofit® System, a non-exercise VO2max estimation device using seismocardiography and proprietary AI, targeting healthcare providers, corporate wellness programs, and sports medicine practitioners in Europe and the US.

Ownership category

akta.pro rank

Product category

Medical Devices

NAICS

Electromedical and Electrotherapeutic Apparatus Manufacturing (334510)

SIC

Electromedical & Electrotherapeutic Apparatus (3845)

akta.pro primary industry

Cardiology Telemedicine Platforms (HLALAGAB)

Keywords

• VO2 max estimation
• Seismocardiography devices
• Cardiorespiratory fitness assessment
• Medical device hardware
• Preventive health technology

Headquarters

HQ city

Hellerup

HQ country

Denmark

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Seismofit Hardware Sales: One-time initial cost for the Seismofit sensor hardware device. The sensor is a certified medical device (CE-marked class 1) sold to health professionals.
2. VO2 Max Estimation Subscription: Subscription model for ongoing VO2 max estimations. Follows the initial hardware purchase, providing a cost-effective ongoing solution for measurements. Pricing structure designed to be highly economical compared to traditional methods.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

Core offering

VentriJect manufactures and sells the Seismofit® System, a CE-marked Class 1 medical device that estimates cardiorespiratory fitness (VO2 max) in under 3 minutes without exercise, using seismocardiography captured by a compact chest-mounted accelerometer and processed by a proprietary AI algorithm. The offering is sold to healthcare providers, corporate wellness programs, and sports medicine/fitness professionals across Europe and, increasingly, the United States, combining one-time hardware sales with an annual subscription for ongoing VO2 max estimations.

Product overview

VentriJect offers the Seismofit System—a unified product portfolio centered on non-exercise VO2max estimation. The system consists of four integrated components: the Seismofit Sensor (a compact accelerometer that captures chest vibrations), the Seismofit Patch (single-use adhesive attachment), the Seismofit App (mobile interface for recording and results), and the Seismofit Algorithm (cloud-based AI that processes data and generates VO2max scores). The system delivers clinical-grade cardiorespiratory fitness assessment in under 3 minutes without physical exertion, targeting health and fitness professionals.

Differentiator

Problem solved

Functional benefit

Brands

• Seismofit®: The Seismofit® System is the company's core product that estimates VO₂ max using seismocardiography technology combined with an AI algorithm. It includes the Seismofit sensor, patch, and app components.

Products and services

• Seismofit® System Complete cardiorespiratory fitness assessment solution combining a chest-mounted accelerometer sensor, adhesive patch, mobile app, and cloud-based AI algorithm to estimate VO2 max in under 3 minutes without physical exertion; CE-marked Class 1 medical device targeted at health and fitness professionals.
• Seismofit® Sensor Compact (3 cm x 5 cm x 1.5 cm) lightweight (25g) chest-mounted accelerometer that captures seismocardiographic vibrations generated by the heartbeat; powered by a standard 3V CR2032 button battery and sold as the hardware element of the Seismofit System to health professionals.
• Seismofit® Patch Hypoallergenic adhesive patch for precise fixation of the Seismofit Sensor at the distal sternum; single-use disposable product designed for secure attachment and user comfort during seismocardiography sessions.
• Seismofit® App (Clinical and Wellness versions) Mobile application (iOS and Android) serving as the control center for seismocardiography recordings, guiding users through measurement and displaying the VO2 max score; Clinical version for EU healthcare professionals and Wellness version for US general wellness use.
• Seismofit® Algorithm (VO2 max estimation) Cloud-based AI service that transforms recorded seismocardiographic heart vibrations into VO2 max scores by analyzing timing, morphology, amplitude, peak-to-peak ratios, and heart rate variability alongside user physiological data (height, weight, age, sex); delivered under an annual subscription tied to the Seismofit Sensor.

Quantifiable outcome

• Up to 70% mortality risk reduction with high VO2 max vs low VO2 max
• +2 more outcomes

Named customers6 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability3 records

Feature4 records

Partnerships

19 partnerships are on record, tiered core and minor.

• EHE HealthcoreStrategic or Co-development Partner · 2 December 2025EHE Health, a US preventive healthcare provider, is launching VO2 max testing innovation using the Seismofit sensor across its clinics in the United States. This represents VentriJect's entry into the US market with a major healthcare partner.
• FalkminorChannel Partner/ Reseller/ DistributorHealth and fitness industry partner integrating Seismofit into their health check and fitness programs
• CreceaminorChannel Partner/ Reseller/ DistributorHealth industry partner using Seismofit for cardiovascular fitness assessments
• MotiominorChannel Partner/ Reseller/ DistributorHealth industry partner offering Seismofit-based VO2 max measurements
• NurseCareminorChannel Partner/ Reseller/ DistributorHealthcare provider partner using Seismofit for patient assessments
• AG SundhedsfremmecoreChannel Partner/ Reseller/ DistributorCorporate health provider using Seismofit as supplement to Health Check programs, replacing previous health measurements with modern solution
• IPNminorChannel Partner/ Reseller/ DistributorHealth industry partner integrating Seismofit into their services
• WellbminorChannel Partner/ Reseller/ DistributorHealth and wellness partner offering Seismofit assessments
• Median KlinikenminorChannel Partner/ Reseller/ DistributorMedical clinic chain partner using Seismofit for fitness assessments
• SiemensminorChannel Partner/ Reseller/ DistributorCorporate partner offering Seismofit-based health assessments
• ThirSpaceminorChannel Partner/ Reseller/ DistributorHealth industry partner using Seismofit technology
• TIGRAcoreChannel Partner/ Reseller/ DistributorPreventive Medical Examination provider using Seismofit as replacement for strenuous step tests in employee health assessments
• UELI LANZminorChannel Partner/ Reseller/ DistributorHealth/fitness professional partner offering Seismofit measurements
• Aalborg UniversitycoreStrategic or Co-development PartnerAcademic partner and founding institution. VentriJect originated as spin-out from university's cardiology research center. Key founders (Kasper Sørensen, Samuel Schmidt, Peter Søgaard) maintain academic affiliations. University continues as research collaboration partner.
• University of CopenhagenminorStrategic or Co-development PartnerAcademic research partner in cardiovascular fitness assessment research
• University of HamburgminorStrategic or Co-development PartnerAcademic research partner contributing to scientific understanding of cardiovascular fitness assessment
• SENSminorStrategic or Co-development PartnerResearch institution partner in fitness assessment research
• Exercise is MedicineminorStrategic or Co-development PartnerGlobal health initiative partner promoting physical activity and fitness assessment
• University of SheffieldminorStrategic or Co-development PartnerAcademic research partner contributing to research on Seismofit technology

Scale indicators5 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Acarix A/S: Swedish-listed cardiac diagnostics company founded by the same VentriJect co-founders (Peter Samuelsen and Samuel Schmidt) out of similar cardiology research. Acarix uses CADScorSystem for coronary artery disease risk assessment—the most directly comparable peer given shared DNA, technology origin, and target market.
• Firstbeat: Finnish physiological analytics company (now part of Garmin) specializing in heart rate variability-based VO2 max, recovery, and training load analytics. Direct competitor in the non-exercise / physiology-based cardiorespiratory fitness estimation space, with comparable target customers (sports performance, wellness, health).
• COSMED: Italian manufacturer of professional cardiopulmonary exercise testing (CPET) equipment, the gold-standard VO2 max systems VentriJect aims to disrupt. Closest direct competitor in the VO2 max measurement category, serving cardiology, sports medicine, and research labs globally.
• Polar Electro: Finnish wearables company offering VO2 max estimation via fitness watches and chest straps, targeting sports/fitness and increasingly preventive health customers. Direct competitor at the consumer/fitness tier with similar technology approach (sensor + algorithm) and overlapping customer base in sports medicine and corporate wellness.
• Vyaire Medical: US-based respiratory and cardiopulmonary diagnostics company offering spirometry, metabolic carts, and VO2 max testing equipment. Directly comparable as a clinical-grade cardiopulmonary diagnostics provider serving hospitals, cardiology, and pulmonary function labs.

Broad incumbents

• Garmin: Global wearables giant offering VO2 max estimation across its fitness watch portfolio (via Firstbeat acquisition). Broad incumbent with massive distribution and consumer brand; competes with VentriJect primarily at the consumer/preventive wellness tier where Seismofit's medical-grade positioning differs.
• Apple: Apple Watch offers cardio fitness (VO2 max) notifications and exercise-based VO2 max estimation across hundreds of millions of devices. Largest incumbent threat in consumer-facing cardiovascular fitness measurement, with regulatory and distribution advantages VentriJect cannot match at scale.

Emerging players

• Whoop: US-based subscription wearable company focused on recovery, strain, and cardiovascular metrics including VO2 max estimation. Comparable business model (hardware + subscription), similar target audience (performance/wellness-oriented consumers), and partial overlap in cardiovascular fitness measurement category.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/ventriject
• Xx.com/ventriject

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

Funding overview

Funding rounds2 records

Investors4 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 VentriJect