Challenger Demo Day is the culmination of the Challenger Accelerator, bringing together participating startups to showcase the progress they have made throughout the program.

The Demo Day, which took place on April 22, marked the culmination of the Challenger Accelerator 4.0 startup program.

Ukrainian startups working in sustainability, green tech, energy, mobility, construction, demining, and prosthetics are invited to join the Challenger Sustainability Q&A Session on June 4, 2026, from 3:30 to 5:00 PM Kyiv Time (EEST) to learn more about the upcoming accelerator program.

The Startup Battle by Challenger Sustainability Accelerator brought together founders, innovators, and ecosystem representatives in Kyiv for an evening of live startup pitches, expert feedback, and networking around sustainability-driven innovation. Four startups presented their solutions, with Soily.World winning two tickets to IT Arena 2026.

Challenger Sustainability Accelerator will host a Startup Battle, bringing together Ukrainian sustainable tech startups for a live pitching competition.