Inside Demo Day: See What Yale Founders Built This Summer

Demo Day 2025

All summer long, 15 Yale student-led ventures have been sprinting forward in the Tsai CITY Summer Fellowship—an intensive eight week accelerator where founders receive $20,000 in funding, tailored mentorship, and venture development training. They’ve been building, testing, and refining bold ideas in real time.

Now, it all comes together at Demo Day.

What is the Summer Fellowship?

The Summer Fellowship program at Tsai CITY is designed to help student entrepreneurs, nonprofit founders, and creatives take their ventures to the next level. Fellows spend eight weeks immersed in venture-building: attending workshops, learning from mentors, and working side-by-side in a peer community of innovators.

It’s an intense, transformative experience, and Demo Day is where you’ll see the results.

Meet the 2025 Fellows

This year’s 15 ventures span sustainability, healthcare, technology, creative industries, and more. A few highlights:

  • Aroomy: an AI-powered 3D design platform making home design and rebuilding accessible and affordable, especially for communities recovering from crisis.
  • FulcrumCare: improving oral health for individuals with complex needs through a tech-enabled dental care organization.
  • Le Bezel: delivering ethical, sustainable lab-grown diamond jewelry at a fraction of the cost of mined diamonds.
  • Neotix: a GPU aggregation platform—like Airbnb for GPUs—powering AI development across industries.
  • Prevision Labs: a VR tool helping designers and directors collaboratively build show sequences in real time before stepping on stage.
  • Vault Kinetics: a fit-tech startup reimagining human movement with proprietary force-sensitive flooring.

And that’s just the beginning. From healthcare and sustainability to entertainment and cutting-edge tech, these founders are tackling challenges that touch communities worldwide.

See the full 2025 cohort here. 

What to Expect at Demo Day

Demo Day is your chance to see these ventures in motion. You’ll watch high-energy pitches, hear the stories behind the ventures, and meet the people who have poured their summers into building something new. Beyond the stage, you’ll have the opportunity to connect with Yale’s community of innovators.

Why You Should Attend

Whether you’re an entrepreneur, a student, a mentor, or simply someone who loves big ideas, Demo Day is the place to be. It’s a celebration of creativity, problem-solving, and community. And you won’t want to miss it.