Variolytics, founded in Stuttgart in 2020 as a spin-off from the Fraunhofer Institute and led by founder Matthias Stier, measures greenhouse gases at wastewater treatment plants. Its EIC project described "the first system that enables online monitoring of greenhouse gases (nitrous oxide and methane) and chemical pollutants" at such plants, using mass spectrometry and AI to adjust aeration, with promised savings of 20% on energy and chemicals and emission cuts of up to 50%, according to CORDIS.
The European Innovation Council granted €1,724,625 towards a €2.46 million project from April 2023 to March 2025. The final report says the project "delivered all promised technical outputs: the multiplexing hardware, the EmiCo Lite analyzer, the AI/digital twin software, and the cloud-based user platform", and that a pilot in Stuttgart now avoids an estimated 1,522 tonnes of CO₂-equivalent a year. In January 2025 Variolytics closed a growth financing round led by Nordic Alpha Partners, with the EIC, High-Tech Gründerfonds and Fraunhofer's technology transfer fund.
Company file
- Legal entity
- Variolytics GmbH, HRB 773239, Stuttgart
- Founded
- 2020, Fraunhofer spin-off
- People
- Matthias Stier (founder, managing director), Johann Barlach (managing director)
- Products
- EmiCo lite, EmiCo Insight, Insight Air, EmiCo Gateway, Vario two
- Investors
- Nordic Alpha Partners, EIC, HTGF, Fraunhofer Technology Transfer Fund
- EIC project
- VARIO, 1 Apr 2023 to 31 Mar 2025, closed
- EIC funding
- Blended finance
Where Variolytics Stands Now
Variolytics sells a family of EmiCo analysers and software. In 2025 it joined an EU-funded project on sustainable semiconductor production, and in 2026 it registered a capital increase and published a patent on regulating aeration, register records on North Data show. Its lead investor said it had worked with the team since August 2024 on "validating pricing, refining the go-to-market plan, and identifying key customers".
"WP3 delivered all promised technical outputs: the multiplexing hardware, the EmiCo Lite analyzer, the AI/digital twin software, and the cloud-based user platform."
Variolytics, final report to the EICThe Technology: One Analyser, Many Basins
Nitrous oxide and methane make up over 70% of wastewater plants' direct greenhouse emissions, the report says, and both can be avoided with the right process control. VARIO samples several aeration basins with one mass spectrometer and uses AI models and a digital twin to recommend or apply aeration changes. The report says the project identified drivers such as oxygen transfer rate and ammonia levels.
What the EIC Project Promised, and What CORDIS Shows
The project promised online monitoring and AI control ready for market. The report documents all technical outputs and a working pilot, with some tasks redirected along the way. The Stuttgart figures come from a single pilot. CORDIS lists the project as closed.
- Multiplexing hardwareDeliveredPer final report.
- AI and digital twinDeliveredPer final report.
- Pilot resultsDeliveredStuttgart plant.
- Commercial scaleUnverifiedSales not public.
The Money
The size of the 2025 growth round and the EIC's share have not been disclosed. Variolytics has filed accounts up to 2024 in Germany, but revenue is not publicly summarised. Its registered share capital rose from €65,790 in February 2025 to €86,168 in July 2026, indicating new shares were issued.
What Cannot Be Checked
Questions for the EIC
How much the EIC invested, how many plants use Variolytics' systems and what the company earns are not public.
Why Europe Should Care
The report says wastewater plants produce about 2% of EU emissions and that new EU rules require them to monitor and report direct emissions. A European tool that measures and reduces nitrous oxide fits that need directly. The EIC funded it and then invested alongside Nordic Alpha Partners.
What the project promised
The first online monitoring and AI control of greenhouse gases at wastewater plants, ready for market.
What the record shows
All technical outputs delivered, a pilot avoiding 1,522 tonnes of CO₂e a year and new investment.
The Verdict
Delivered, commercial scale unknown
Variolytics built the system the EIC paid for and won follow-on investment. How widely utilities have adopted it has not been published.
Variolytics and the EIC have not been asked for comment for this article. It is based entirely on public records and published statements, linked throughout.
