YC Startup Tracker

Y Combinator's portfolio continues to diversify across health, AI infrastructure, and global talent pipelines, with three distinct startups hitting new milestones.

Legacy's profitability and military partnerships signal a maturing digital health model, while Hamming AI's $4. 4M raise underscores growing demand for AI voice agent reliability tools.

Meanwhile, YC's new India student track with Polaris School marks a strategic push to source early-stage founders outside the traditional application funnel, creating a direct pipeline from campus to cohort.

Tracking: Y Combinator

Geography: Mountain View, Silicon Valley, San Francisco, California

1. Y Combinator-Backed Legacy Named North America's Leading Digital Male Fertility Clinic

Legacy, founded by Khaled Kteily in 2018, has become the top digital male fertility clinic in North America, backed by over $50 million from investors including Bain Capital Ventures, Y Combinator, FirstMark Capital, and celebrities like Justin Bieber.

The company provides at-home sperm testing and storage, completing nearly 100,000 tests, and partners with major insurers and military organizations.

Legacy graduated from Y Combinator's Summer 2019 batch and achieved profitability in 2024 after a funding round led by TRAC. vc.

It was named a Y Combinator Top Company in 2024 and works with the Cleveland Clinic, NYU Langone, and the Veterans Health Administration, offering free services to Navy SEALs and Green Berets.

Key facts:

- Legacy raised over $50 million from Bain Capital Ventures, Y Combinator, FirstMark Capital, and celebrity investors.

- Graduated from Y Combinator's Summer 2019 batch after winning TechCrunch Disrupt Berlin in 2018.

- Completed nearly 100,000 semen analyses, DNA fragmentation tests, and sperm cryopreservation procedures.

- Achieved profitability in 2024 following a round led by TRAC.vc, FirstMark Capital, and Samsung Next Ventures.

- Named a Y Combinator Top Company in 2024 and listed among Forbes' Best Startup Employers.

Why it matters: Legacy's rise signals a growing venture-backed push into male reproductive health, a historically underserved market.

Its success validates Y Combinator's ability to scale health-tech startups from accelerator to profitability, and its military partnerships address infertility risks from toxic exposures and operational stress.

For the startup ecosystem, Legacy shows a path from competition winner to category leader with diverse backing from institutional VCs and celebrities. Watch for potential unicorn status and expansion of at-home testing to broader populations.

Finance

2. Y Combinator partners with Polaris School for India student startup track

Y Combinator has partnered with Polaris School of Technology and Emergent to launch the Vibecon Student Track, a build-first competition for Indian student teams.

From the applicant pool, only five teams will be shortlisted for a final round at Polaris's Bengaluru campus on April 16-17, 2026, where they will compete in a live building sprint.

The winning team earns a direct interview with YC partners for an upcoming cohort, bypassing the traditional global application route.

The top three teams will share $10,000 in cash prizes plus over $10,000 in tools and cloud credits from AWS, Anthropic, and Razorpay. The judging panel includes Razorpay co-founder Shashank Kumar and Lightspeed partner Hemant Mohapatra.

Key facts:

- Five teams will be shortlisted for the final round on April 16-17, 2026.

- The winning team gets a direct interview with YC partners for an upcoming cohort.

- Top three teams share $10,000 in cash prizes and over $10,000 in credits.

- Judges include Razorpay co-founder Shashank Kumar and Lightspeed partner Hemant Mohapatra.

- Polaris offers a four-year skills-first CS program with 5,000 hours of coding.

Why it matters: This partnership creates a new, application-free entry point into Y Combinator for Indian undergraduate builders, prioritizing raw building ability over credentials or geography.

It signals that elite startup networks are willing to bet on live performance tests rather than traditional filters, potentially reshaping how young founders in India access global accelerator opportunities.

The move also strengthens Polaris School's positioning as a skills-first institution and may pressure other Indian programs to adopt similar build-first selection models.

Ascendants

3. Hamming AI (YC S24) raises ~$4.4M for AI voice agent testing

Hamming AI, a Y Combinator Summer 2024 startup, builds testing and monitoring infrastructure for AI voice agents. Founded in 2024 in San Francisco by Sumanyu Sharma and Marius Buleandra, the company has raised approximately $4.

3 to $4. 55 million across two rounds from investors including Mischief, Y Combinator, AI Grant, and others.

The platform lets companies simulate thousands of phone calls with varied personas and accents to catch failures before deployment. Hamming has expanded into production monitoring, red teaming, and prompt version control.

It does not offer self-serve signup; access is through guided demos. Named customers include Podium, Bland, 11x, Smith.

ai, and Luma Health. Revenue is undisclosed, and team size estimates range from 8 to 20 employees.

Key facts:

- Founded in 2024 in San Francisco by Sumanyu Sharma and Marius Buleandra.

- Raised approximately $4.3 to $4.55 million across two rounds from Mischief, Y Combinator, and others.

- Product tests AI voice agents with simulated calls to catch failures before production.

Why it matters: Hamming AI addresses a critical reliability gap as companies deploy AI voice agents in healthcare, insurance, and customer service. By providing automated testing and monitoring, it helps prevent embarrassing failures in production.

This signals a maturing ecosystem where tooling for AI agent quality assurance becomes essential. Competitors like Podium and Bland may face pressure to adopt similar rigorous testing.

With integrations into Cisco Webex and Retell AI, Hamming is positioning itself as a compliance and governance layer for regulated industries.

The absence of self-serve pricing suggests a focus on enterprise sales, which could shape how voice agent testing tools are adopted.

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