Open Call #3 is the final call of the programme, open until 19 May 2026, 17:00 CEST.

If you are thinking about applying, take a moment to reply to these questions: 

Deep-tech founders don’t attend events. They use them. The founders who extract real value from the ecosystem don’t treat events as stages, they treat them as systems. Systems for testing their narrative with real stakeholders. For translating complex technology into outcomes that resonate. For understanding who actually needs what they’re building. Because in deep tech, traction often begins before the product is finished. And the right conversation at the right event, in the right room, can become a turning point. The question is never ‘should I attend?’ It’s ‘am I ready to use this?’

Through Open Call #3, Open Horizons invites startups to tackle real challenges defined by industry leaders and turn cutting-edge technologies into market-ready solutions.