About OpenSpiro

Martin Brüggemann spent years training too hard, too fast, in the wrong zones. As co-founder of t3n Magazin and New Zapiens, he builds tech products for a living. As an ultra-cyclist and runner, he wanted to actually understand what's happening inside his body during exercise.

So he bought a VO2 analyzer. For the first time, he could see his metabolism in real time - and realized just how wrong his 'easy pace' had been. But one thing drove him crazy: his Garmin Rally power pedals never showed up in the spiroergometry session. Every time, he had to manually merge power data afterwards. When the company behind his VO2 analyzer filed for insolvency, the software was at risk of stopping working entirely.

That's when OpenSpiro was born. Built by PrioPad Labs, it started as a rescue mission for orphaned Calibre Bio devices - and grew into something bigger: spiroergometry software that finally integrates power meters and smart trainers natively. No more data merging. No lab appointment needed. Whether you're an ambitious athlete optimizing FatMax zones, a coach managing a team, or someone with prediabetes tracking metabolic health - Martin believes everyone deserves access to what their body is actually doing. Not locked behind a US SaaS subscription, and as a complement to your local sports medicine lab - at home, on the trainer, whenever you want.