Enabling Better Buildings
Professional-grade simulation software and expert services for architects, engineers, and building scientists worldwide.
Our Products
Professional-grade building physics simulation tools powered by proven WUFI® technology, now in the cloud
METr
Passive building energy modeling for Phius certification and high-performance design
For: Phius certifiers • Passive house designers • Energy consultants
- Phius 2021 & 2024 certification support
- Cloud-based — no installation required
- Based on proven WUFI Passive technology
C3RRO Plus
Dynamic hygrothermal building simulation for energy and moisture analysis
For: Building scientists • Moisture consultants • Forensic analysts
- Coupled heat & moisture transport
- Based on proven WUFI Plus technology
- Cloud-based simulation
C3RRO API
Integrate hygrothermal simulation into your applications and workflows
For: Developers • Research teams • Platform builders
- RESTful API with JSON responses
- Automate thousands of simulations
- Python & JavaScript SDKs
The 3 C's — Work With Us
Beyond software — partner with our building science experts for custom solutions, research, and knowledge transfer
Code
Custom software development for building science applications. We build simulation tools, certification platforms, and integrations tailored to your organization's needs.
Discuss Your ProjectCompute
High-volume simulation services and research computing. We run complex analyses at scale — from parametric studies to large-scale building stock assessments.
Explore Compute ServicesConsult
Expert building science consulting. From forensic moisture investigations to research collaborations, our team brings PhD-level expertise to solve complex problems.
Schedule a ConsultationOur Story
Founded by former Fraunhofer Institute researchers who created the world-renowned WUFI software suite, C3RRO (pronounced "zero") brings decades of building physics research into modern, cloud-powered tools. Our name represents our core services — Coding, Computing, and Consulting — and our mission: enabling buildings with zero energy waste, zero durability issues, and zero compromises on comfort.
Learn more about our team and missionWhat Drives Us
We believe that integrating building science know-how in the building design and operation phases can significantly improve occupant health and well-being alongside building quality while enabling buildings to contribute to reduce greenhouse gas emissions.
Better Buildings
Improving health, comfort and sustainability of buildings
Zero Carbon
Fostering environmentally responsible building practices and technologies
Integrity
Cultivating a culture of transparency and honesty in all our actions and decisions
Why Choose C3RRO?
Built by building physicists, for building professionals
Cloud-Based
Access from anywhere, on any device. No installation or updates required.
Proven Technology
Based on WUFI — trusted by thousands of professionals worldwide for decades.
Research-Backed
Developed by former Fraunhofer Institute researchers with PhD-level expertise.
Standards Compliant
ISO 13788, ISO 15026, EN 15026, ASHRAE 160, Phius 2021 certified.
Comprehensive Support
Extensive documentation, video tutorials, and expert technical support.
50+ Years Expertise
Combined team expertise spanning five decades of building physics research and software development.
Ready to get started?
Transform your building projects today
Join leading architects, engineers, and building scientists using C3RRO for sustainable building design.