Y Combinator Winter 2015 (W15) Companies

Valor Water Analytics provides a SaaS platform that analyzes operational data from water utilities to identify inefficiencies and improve system performance.

1 investor

Vanhawks makes a carbon fiber commuter bicycle with integrated GPS, blind-spot sensors, and connected lights, paired with a mobile app that provides turn-by-turn navigation, route optimization, and activity tracking for urban cyclists.

2 investors

Vest engineers derivatives-based investment strategies into scalable ETF and outcome-focused products for financial advisors and investors. The company provides target outcome strategies and precision investment tools designed to deliver defined results for portfolio management.

1 investor

VetPronto operates a veterinary service that brings licensed veterinarians to pets' homes and workplaces across multiple U.S. markets. The platform uses technology to manage medical records, client communication, and operational workflows, and offers telemedicine and integrated pharmacy services.

2 investors

WayUp is a job matching platform for early-career candidates, helping students and recent graduates discover entry-level and internship opportunities. The platform connects job seekers with employers and focuses on matching candidates based on skills and fit rather than demographic factors.

1 investor

Wink Health provides remote diagnosis and treatment for sleep apnea through a smartphone app for initial screening, virtual doctor consultations, and home delivery of medical equipment. The service addresses the gap where most sleep apnea patients remain untreated by reducing traditional barriers to care.

1 investor

WorkLife is a web application that helps teams reduce meeting inefficiency by guiding them through agenda creation, time management during discussions, and action item tracking. The tool targets organizations looking to recover productive time lost in their recurring meetings.

3 investors

X-ZELL develops cryoimmunostaining platforms and multiplex panels for cytology laboratories, enabling extraction of multiple biomarkers from single tissue specimens while preserving samples for further testing. The company serves pathologists, oncologists, and diagnostic partners primarily in Southeast Asia with CE-marked, ISO 13485-certified reagents and workflow solutions.

1 investor

YesGraph uses machine learning to analyze social connections and suggest which contacts users should invite to an app or website, helping applications improve referral and invite conversion rates.

1 investor

Yhat provided a platform for managing the complete lifecycle of data science projects, from model development through deployment. The company was acquired by Alteryx.

1 investor

Zeitview provides advanced inspection software for high-value infrastructure assets including solar, wind, properties, telecom, and utility infrastructure. The platform uses aerial imagery and inspections to help operators monitor asset condition and performance throughout their lifecycle, enabling better decision-making and cost efficiency in renewable energy and sustainable infrastructure.

4 investors

Zenflow develops medical devices for treating benign prostatic hyperplasia (BPH) in men, founded from the Stanford Byers Center for Biodesign with a team experienced in medical device development and FDA regulation.

3 investors