Turning Heat Flux into Winning Data

Turning Heat Flux into <b>Winning Data</b>
Do you believe in the opportunities and possibilities of data-driven, technological innovations?

What digital change means for us

Hi! We’re greenteg. We develop, manufacture, and market a sensor technology that is used by researchers and industry to push key innovations and by companies in a wide range of sectors and regions of the world to perform at a more sustainable and secure level. Ready for more?

Making our Partners successful

greenteg sensors are used as smart wearables all over the world. Product developers and companies in a wide range of industries trust our products and solutions. Scientists and international research teams use our certified sensor technology for their studies. greenteg sensors are 100% developed and manufactured in Switzerland.

Chronicle of a Swiss-made cutting-edge sensor technology














2023 - We’re at fever pitch...

…for Feverflux, our latest development for the American market offering precise core body temperature measurement. Feverflux will shortly be launched once FDA 510 (k) approval has been obtained. More to follow soon...

2022 - Award-winning greenteg technology

With CORE and calera®, greenteg wins three CES Innovation Awards in the Health & Wellness, Sports & Fitness, and Wearable Technologies categories. calera® is introduced as a new brand name for medtech and wearable applications. With the relaunch of the company website, another important milestone is reached – and greenteg is perfectly equipped for the next funding round.

2021 - The CORE sensor conquers the world

greenteg presents the CORE sensor to a broader market by exhibiting at the major EUROBIKE and MEDICA trade fairs. In the summer, various professional athletes use CORE in the Tour de France and other races, along with ten gold-medal winners at the Olympic Games in Tokyo. Launch of several products by partners using greenteg’s calera® technology.

2020 - Our technology is effective during lockdown

During the first wave of COVID-19, greenteg supports clinical research with CORE prototypes for measuring core body temperature. A little later, the FDA grants emergency use authorization. The German cycling team BORA-hansgrohe uses CORE sensors during the Tour de France. And greenteg gSKIN® sensors reach the International Space Station (ISS) on an unmanned supply vehicle launched by JAXA.

2019 - ...and a new company location

greenteg presents its CORE prototypes at the world’s largest tech show, CES in Las Vegas. The same year, it moves to new premises at Zurich Airport – covering >1,000 m². greenteg is awarded the Horizon Europe 2020 Seal of Excellence and a grant from Innosuisse for a sensor that can detect neurodegenerative disease at an early stage. The company also exhibits at the MEDICA medical technology fair.

2018 - It’s time for the next big step...

Investment round to further grow the business and production capacity. Business development of core body temperature measurement technology is especially targeted with investment funding, and initial prototypes are tested in a clinical environment and with partners.

2017 - Making wearables more visible

With a focus on the growing wearables industry, greenteg also raises its profile by participating in the Web Summit and Swiss Medtech Day. An exclusive photonics partnership with Thorlabs Inc. begins.

2016 - The first wearable sensor worldwide – a greenteg innovation

Successful conclusion of another funding round with a promising prototype. The first wearable for the R&D sector offering core body temperature monitoring is launched, leading to increased interest from current and new investors.

2014 - A new sector with huge potential

With the gSKIN® Kit, greenteg tackles U-value measurement in the building sector. With the launch of this product, the prospering company is now already operating successfully in three business fields.

2013 - New Sparring Partner in the Photonics Industry

The first gRAY® sensors are sold to Thorlabs Inc., a global company and market leader in devices and components for generating and measuring laser sources as well as optical coherence tomography and photoacoustic analysis equipment.

2012 - The business gets serious

greenteg expands and moves into Technopark Zurich, where its office and production facilities are expanded to >200 m². The company successfully completes the rocky seed period, obtains patents for three developments as well as several trademarks, and achieves market readiness with heat flux sensors for the R&D sector.

2010 - And the winner is ...!

Seed funding is obtained for greenteg’s sensor technology, which wins various awards and innovation prizes, including ClimateKIC, InnoSuisse and the W.A. de Vigier Award. greenteg is also named one of the top 100 Swiss start-ups.

2009 - Green from the outset

greenteg’s success story begins in Zurich in 2009. The company is founded as a spin-off of ETH Zurich, the Swiss Federal Institute of Technology. Its technology is based on a scalable heat flux sensor developed at ETH Zurich’s Chair of Micro- and Nanosystems.

News & Events
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“Our second-generation CardioWatch 287 performed well in a broad series of tests with its medically validated data covering eight vital parameters – core body temperature measured using the caleragt sensor – and its excellent ease of use.”

Dr. Peter Stas

CEO Corsano Health