GreenTEG
GreenTEG is a Swiss ETH Zurich spin-off that develops patented heat flux sensor technology (CALERA®) for non-invasive continuous core body temperature monitoring, licensing it to medical, wearable, and OEM partners while selling its own CORE sports and work-safety devices directly.
- Company typePrivate
- Founded2009
- HeadquartersZürich, Switzerland
- Headcount11–50
- GTM typeB2B
- OfferingHardware or Manufacturing
What GreenTEG does
GreenTEG (legal entity greenteg AG) is a Swiss thermal sensing company founded in 2009 as a spin-off of ETH Zurich, headquartered in Rümlang near Zurich Airport with 40+ specialists. Its core technology is a patented heat flux sensor platform commercialized under the CALERA® brand, which delivers continuous, non-invasive core body temperature measurement by sensing heat flux at the skin surface rather than requiring ingestible or insertible probes. This sensor is embedded into OEM partner products (Withings ScanWatch, Corsano CardioWatch, Myant Skiin smart textiles, J-style X7 Ring, Thorlabs thermal power sensors), licensed for medical and wearable integrations, and also sold under the company's own consumer brand CORE (CORE, CORE 2, CORE Live) for sports performance and workforce heat-safety monitoring.
The company operates five product lines spanning distinct verticals: CALERA® for health, sports and work-safety wearables; CORE for direct-to-consumer sports sensors; gSKIN® for R&D-grade heat flux measurement; uval® for non-destructive U-value measurement in building energy assessment; and gRAY®/ray® for photonics and laser power sensing. AI-based algorithms layer on top of the sensor data for clinical and fertility analytics, and the technology has been validated in more than 10 clinical studies and won three CES Innovation Awards in 2022.
GreenTEG monetizes through a hybrid model combining hardware sales (CORE consumer devices at CHF 289.95–€329.95, uval kits, gSKIN research sensors), OEM licensing and white-label integration with global manufacturers, and distribution partnerships (notably an exclusive photonics relationship with Thorlabs for gRAY sensors). Customer concentration is spread across healthcare OEMs (Withings, Corsano Health), semiconductor partners (ams OSRAM), photonics (Thorlabs), sports teams (BORA-hansgrohe), research institutions (ETH Zurich, Duke, KIT), industrial buyers (Holcim, City of Basel), and a direct consumer base purchasing through corebodytemp.com and shop.greenteg.com.
GreenTEG firmographics
Firmographics- Name
- GreenTEG
- Legal name
- greenteg AG
- Website
- https://greenteg.com
- Company type
- Private
- Founded year
- 2009
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- GreenTEG is a Swiss ETH Zurich spin-off that develops patented heat flux sensor technology (CALERA®) for non-invasive continuous core body temperature monitoring, licensing it to medical, wearable, and OEM partners while selling its own CORE sports and work-safety devices directly.
- Ownership category
- akta.pro rank
GreenTEG industry classification
Industry- Product category
- Thermal Sensors and Heat Flux Measurement
- NAICS
- Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use (334512), Electromedical and Electrotherapeutic Apparatus Manufacturing (334510)
- SIC
- Electromedical & Electrotherapeutic Apparatus (3845)
- akta.pro primary industry
- Environmental Sensors (Temperature/Humidity/Gas/Air Quality) (HDAHALAD)
- akta.pro secondary industries
- Continuous Temperature & Fever Monitoring (Wearable Thermometry) (HLAHACAK), Thermometers & Temperature Monitoring (Smart Thermometers) (CRACAQAG)
Keywords
Where GreenTEG is headquartered
LocationHeadquarters
- HQ city
- Zürich
- HQ country
- Switzerland
- HQ region
- Europe
Offices1 record
Markets served
GreenTEG business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Technology or R&D, Operations, Marketing or Sales, Infrastructure
Revenue model
- Hardware Sensor Sales: Sale of proprietary heat flux sensors including CALERA, gSKIN, uval, and gRAY product lines for various applications.
- OEM Integration Services: Technology licensing and integration services for embedding CALERA sensor technology into third-party wearables and medical devices, including white-label solutions.
- Consumer Wearable Sales: Direct sales of CORE branded products to athletes and consumers via e-commerce channels.
- Building Measurement Products: Sale of uval wireless and wired kits for U-value measurement in construction and building energy efficiency applications.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| One time/ perpetual license | Pay-as-you-go | CORE 2 Sports Performance Sensor |
| One time/ perpetual license | Pay-as-you-go | CORE Thermal Sensors |
Go-to-market motion4 records
Distribution channels5 records
Marketing channels5 records
GreenTEG product offering
Product offeringCore offering
GreenTEG develops and manufactures proprietary heat flux sensor technology centered on the CALERA® platform for non-invasive, continuous core body temperature monitoring. The company sells OEM sensor modules, the CORE/CORE 2 sports wearable, CORE Live workforce safety bundles, uval® U-value building measurement kits, gRAY® photonics laser sensors, and gSKIN® research heat flux sensors, while licensing CALERA® technology for integration into third-party wearables, medical devices, and smart textiles.
Product overview
GreenTEG is a Swiss thermal sensing technology company offering a portfolio of heat flux sensor products and solutions. The core technology CALERA® provides non-invasive core body temperature monitoring for wearables and medical devices. The product portfolio includes: CORE brand products (CORE, CORE 2) for sports performance monitoring; CORE Live and CORE Arx for work safety; CALERA® Health, Sports, and Work-Safety modules; uval® Building for U-value measurement; ray® Photonics for laser sensors; and gSKIN® for R&D applications. The company operates on a technology licensing model (OEM Integration) allowing partners like Corsano Health, Withings, and Thorlabs to incorporate their certified sensor technology into third-party products.
Differentiator
Problem solved
Functional benefit
Brands
- CALERA®: Brand name for medtech and wearable applications including core body temperature monitoring for health, sports, and work safety
- gSKIN®
- uval®
- ray®
- gRAY®
- CORE
- CORE Live
- CORE Arx
Products and services
- CALERA® Flagship heat flux sensor technology brand for non-invasive continuous core body temperature monitoring. Sold as an OEM module and licensed for integration into third-party wearables, medical devices, and smart textiles, and used directly in CALERA® Health, Sports, and Work-Safety solutions.
- CORE 2 Next-generation CORE sports wearable for real-time core body temperature monitoring during training and competition. 48% smaller and 30% lighter than its predecessor, with LED indicator, detachable attachment, BLE and ANT+ connectivity, designed for elite athletes, coaches, and sports scientists.
- CORE Live Workforce safety monitoring solution that uses CORE's proprietary heat flux technology to deliver continuous core body temperature, heat-strain, heart-rate, and skin-temperature data with configurable real-time alerts and geofencing for workers in extreme conditions.
- uval® Building Measurement Kit Wireless and wired U-value measurement kits for assessing thermal transmittance of building envelopes without drilling or damaging materials, used by building physicists, energy consultants, planners, and municipal inspectors for energy efficiency and insulation verification.
- gRAY® / ray® Photonics Sensors Wavelength-independent thermal power and beam-position sensors for laser output monitoring and industrial/medical laser systems. Supplied exclusively into Thorlabs' C-series thermal power sensors under an OEM partnership.
- gSKIN® R&D Heat Flux Sensors Patented high-sensitivity heat flux sensors for research and industrial applications including battery calorimetry, materials testing, aerospace, chemical process research, and bioscience, with deployments on the International Space Station.
- OEM Integration Services Technical integration services that license CALERA® heat flux sensor technology to device manufacturers for embedding into medical, wearable, and industrial products, including white-label and certified sensor solutions.
Quantifiable outcome
- 7 out of 10 top 2024 IRONMAN Kona finishers trust CORE technology
- +3 more outcomes
Companies that use GreenTEG
Customer profileNamed customers16 records
Segments6 records
Ideal customer profiles7 records
GreenTEG technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration7 records
AI capability3 records
Feature6 records
GreenTEG partnerships and signals
Strategic signalPartnerships
13 partnerships are on record, tiered minor and core.
- SEF.GrowthminorRecognition in SEF.Growth ecosystem, highlighting greenteg's innovation in body heat monitoring for early warning signals and sustainable growth.
- J-styleminorX7 Ring incorporating CALERA technology for health monitoring applications.
- Leitwert AGcoreCollaboration on remote patient monitoring systems, combining CALERA Research wearable with Leitwert's monitoring platform. Validated in field studies at University Hospital of Basel for at-home patient monitoring.
- Uppsala UniversityminorDr. Jonathan Cedernaes from Uppsala University received top award in greenteg's 2nd call for research proposals, supporting sleep and circadian rhythm research using CALERA technology.
- ams OSRAMGreenteg became preferred partner for digital temperature sensor AS6221 integration. Sebastian Bauer, Head of Marketing at ams OSRAM, stated partnership sets new standards in health tracking technology.
- WithingscoreIntegration of CALERA technology into Withings hybrid ScanWatch 2 and ScanWatch Nova Brilliant smartwatches, enabling continuous core body temperature monitoring in consumer health wearables.
- City of BaselminorCity of Basel uses uval wireless kit for building energy efficiency assessments and municipal building inspections.
- Myant (Skiin)minorSkiin smart textiles with integrated CALERA sensor technology for continuous health monitoring through fabric.
- Corsano HealthcoreCALERA sensor technology integrated into CardioWatch 287, measuring core body temperature as one of eight vital parameters. Second-generation watch launched November 2022 with medical-grade multi-sensor wristband.
- University Hospital of BaselcoreClinical research collaboration during COVID-19 for continuous core body temperature monitoring in quarantine facilities. Prof. Dr. Jens Eckstein led studies validating CALERA technology for remote patient monitoring.
- BORA-hansgroheminorGerman cycling team used CORE sensors during Tour de France 2020 for real-time core body temperature monitoring.
- HolcimminorUsed uval wireless kit for hot box-cold box (HB/CB) testing in development of sustainable building materials. Holcim validated accuracy of U-value measurements for building envelope assessment.
- Thorlabs Inc.coreExclusive partnership for gRAY sensor integration into Thorlabs photonics products. First gRAY sensors sold to Thorlabs in 2013, evolved into exclusive partnership covering C-series thermal power sensors for laser output monitoring. Thorlabs is a global market leader in devices and components for generating and measuring laser sources.
Scale indicators8 records
Recent moves3 records
Expansion highlights6 records
GreenTEG competitors and assessment
Company assessmentDirect peers
- Sensirion AG: Swiss MEMS environmental and gas sensor manufacturer. Highly comparable as a Switzerland-headquartered sensor specialist selling into medical, industrial, and HVAC applications; Dr. Pascal Gerner, Sensirion's Director of Sales & Marketing, sits on GreenTEG's board, signaling direct competitive overlap.
- Hukseflux Thermal Sensors: Dutch specialist in heat flux and thermal sensors used in building energy efficiency, R&D and industrial applications. Direct competitor in the thin-film heat flux sensor market alongside GreenTEG's gSKIN® and uval® product lines.
- Withings: French consumer health wearables maker that integrates CALERA® into ScanWatch 2 and Nova Brilliant for continuous core body temperature. Comparable as a customer and adjacent competitor to GreenTEG's own CORE-branded consumer products.
- Corsano Health: Swiss-Dutch medical-grade wearables company whose CardioWatch 287 embeds GreenTEG CALERA® for continuous vital sign monitoring. Closely comparable in remote patient monitoring positioning and form factor.
- EKO Instruments: Japan/US manufacturer of heat flux and net radiation sensors for building physics, solar and climate research. Direct peer in the same market research report alongside GreenTEG's gSKIN/uval product lines.
Broad incumbents
- ams OSRAM: Global semiconductor sensor incumbent and GreenTEG's preferred partner for AS6221 digital temperature sensor integration. Competes with GreenTEG's OEM sensor strategy at much greater scale across medical, automotive and consumer wearables.
- OMEGA Engineering (process sensing): Large industrial sensor manufacturer named alongside GreenTEG as a top-5 player in the thin-film heat flux sensor market; broader portfolio but directly overlapping in industrial thermal/heat-flux measurement.
- Hioki E.E. Corporation: Japanese test-and-measurement instrumentation maker identified as another top-5 thin-film heat flux sensor competitor. Comparable in industrial and R&D thermal measurement instrumentation.
- Maxim Integrated / Analog Devices (MAX30205 temperature sensor): Semiconductor incumbents offering clinical-grade digital temperature sensor ICs used in wearable and fever monitoring applications. Indirectly comparable as alternative temperature-sensing silicon that competes for the same OEM design wins as GreenTEG's heat-flux modules.
Emerging players
- Oura: Smart ring maker competing for the same continuous-temperature-and-recovery use case that J-style's CALERA-enabled X7 Ring targets. Comparable consumer wearable category with overlapping health-tracking value proposition.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat6 records
Key risks5 records
Key highlights6 records
Customer concentration
GreenTEG social profiles
Digital presenceGreenTEG compliance and trust
Trust signalCompliance3 records
GreenTEG financial estimates
Financial estimateRevenue estimate
Valuation estimate
GreenTEG leadership team
Management profileNumber of profiles
Profiles9 records
GreenTEG funding detail
Funding detailFunding overview
Funding rounds4 records
Investors3 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
GreenTEG 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 GreenTEG
What does GreenTEG do?
GreenTEG develops and manufactures proprietary heat flux sensor technology centered on the CALERA® platform for non-invasive, continuous core body temperature monitoring. The company sells OEM sensor modules, the CORE/CORE 2 sports wearable, CORE Live workforce safety bundles, uval® U-value building measurement kits, gRAY® photonics laser sensors, and gSKIN® research heat flux sensors, while licensing CALERA® technology for integration into third-party wearables, medical devices, and smart textiles.
Is GreenTEG a public or private company?
GreenTEG is a private company. It is classified as venture growth investor backed and is currently operating.
When was GreenTEG founded?
GreenTEG was founded in 2009. It employs 11 to 50 people.
Where is GreenTEG based?
GreenTEG is headquartered in Zürich, Switzerland, in the Europe region.
How does GreenTEG make money?
Four revenue lines are on record. Hardware Sensor Sales are the primary driver. The others are OEM Integration Services, consumer Wearable Sales and building Measurement Products.
Who are GreenTEG's main competitors?
Direct peers on record are Sensirion AG, Hukseflux Thermal Sensors, Withings, Corsano Health and EKO Instruments. Broad incumbents are ams OSRAM, OMEGA Engineering (process sensing), Hioki E.E. Corporation and Maxim Integrated / Analog Devices (MAX30205 temperature sensor). Oura is listed as an emerging player.
Does GreenTEG have an API?
No public API is recorded for GreenTEG.
What industry is GreenTEG in?
GreenTEG's product category is Thermal Sensors and Heat Flux Measurement. Its primary akta.pro industry code is HDAHALAD, Environmental Sensors (Temperature/Humidity/Gas/Air Quality), with a secondary code of HLAHACAK, Continuous Temperature & Fever Monitoring (Wearable Thermometry). Its NAICS code is 334512 and its SIC code is 3845.