About GreenPT

We didn't think AI had to cost the planet. So we built proof.

GreenPT is a European AI platform that runs on renewable energy, keeps your data in the EU, and shows you exactly what every conversation costs. Not as a feature. As the whole point.

How it started

Two founders, one conviction.

Robert Keus has always been driven by one question: how can technology solve the problems that actually matter? AI's growing impact, on the planet and on our privacy, was exactly that kind of problem, one he felt every time he used the tools available.

He wasn't alone. At Brthrs, Robert's software agency, clients kept asking the same thing: isn't there a fair, European-hosted AI alternative, one that doesn't send their data overseas or hide its energy footprint? There wasn't.

What turned the idea into reality was Cas Burggraaf. Where others saw reasons it couldn't be done, Cas was convinced it could, and knew how to build it. He still makes the hard but right calls today, about our technology and how we run the company.

So they built it themselves. That became GreenPT: AI hosted in Europe, powered by renewable energy, running on open-source models, and transparent about its environmental cost.

What we stand for

Three principles we refuse to compromise on.

Transparency

Transparency over hype

Every conversation on GreenPT shows its real-time energy use and CO₂ output. We'd rather show you the numbers than ask you to trust a label.
Privacy

Privacy as the foundation

Your data stays in the EU, under European law. We never train our models on your conversations. Ever.
Engineering

Sustainable by engineering

We don't buy our way to green. We run on renewable energy, use air-cooled European data centres, and make our models leaner so they simply use less.

The team

The people behind GreenPT.

We're a small team building something deliberately ambitious. Here's who you're trusting with your AI.

Robert Keus

CEO & Founder

The kind of founder who'd rather build the alternative than complain it doesn't exist. Started Brthrs, then GreenPT, for exactly that reason.
Cas Burggraaf

CTO & Co-founder

The engineer behind the green infrastructure. Spends his time making AI models lighter, faster, and provably sustainable, then explaining how on Dutch podcasts.
Ozan Ogreden

Senior Developer

Builds the things you actually use, and occasionally takes the stage to explain the real environmental cost of AI to a room full of people.
Tim van Bergenhenegouwen

Senior Developer

Turns hard technical problems into things that just work. Cares as much about how it's built as whether it runs.
Jo Vonk

Marketing

Makes sure the people who'd want GreenPT actually hear about it, without the hype the rest of the industry runs on.
Morris Kirchner

Support

The person on the other end when you need help. Makes sure using GreenPT feels as good as the idea behind it.
Wilco Burggraaf

Sustainability & Product Advisor

Keeps us honest on the thing we care about most. Challenges every green claim until it holds up to scrutiny.

Why this matters now

The future we'd rather build than wait for.

AI is on track to become one of the biggest energy consumers in the digital world. At the same time, more and more of our most sensitive information flows through systems we don't control, hosted on the other side of the world.

We think Europe deserves an alternative. One that proves you don't have to choose between powerful AI and doing right by your data and the planet.

That's the future we're building toward. And we'd rather build it than wait for someone else to.

Recognition