Y Combinator Summer 2019 (S19) Companies

PredictLeads creates datasets that measure company performance. The platform serves businesses that need accurate data on companies for analysis and decision-making.

2 investors

Prenda provides a learning model and operational support for adults to start and run microschools serving K-8 students. The platform combines customized curriculum, goal-setting frameworks, and community structures designed to help students develop intrinsic motivation and pursue their interests.

4 investors

Prolific connects researchers, AI developers, and product teams with vetted participants for collecting high-quality human data for AI training, surveys, and behavioral research. The platform enables customers across science, technology, and industry to access verified and diverse participant pools for reliable data collection.

2 investors

Prompt helps professionals manage and strengthen their personal relationships through guided support and tools designed to fit busy schedules.

1 investor

A broker-dealer providing institutional equities trading services.

3 investors

Rainbow is a cryptocurrency wallet application that supports multiple blockchains, NFTs, and decentralized exchanges, offering both mobile and desktop interfaces with hardware wallet integration.

9 investors

Ramen VR is a game development studio that previously created the VR game Zenith: The Last City for Steam and Oculus Quest, and is now building an unannounced game along with developer tools such as Aura. The company focuses on solving problems in game development.

2 investors

Recidiviz provides a presentence investigation module that gathers criminal history, institutional data, and social determinants to help investigators produce evidence-based reports and identify effective interventions. The software synthesizes relevant information, visualizes similar past case outcomes, and identifies local opportunities like restorative justice and mental health treatment for criminal justice stakeholders.

1 investor

Revel creates in-person events and digital communities designed for women in their midlife years and beyond.

1 investor

ReverCare provides digital tools and guidance to help older adults and their family caregivers navigate care-related challenges, including access to expert coaches and information on solutions like home care, estate planning, and emergency response systems.

1 investor

Rosebud AI provides generative AI tools that enable users to create games and immersive interactive experiences without requiring extensive technical expertise. The platform uses code generation, video models, 3D generation, and music generation to democratize game development for creators of all skill levels.

5 investors

Rutter provides a Unified API that enables B2B SaaS companies to integrate business data and financial system connections into their products. The platform serves fintech companies and SMB-focused tools seeking to add robust accounting and commerce integrations to their workflow.

4 investors

Sable provides bank accounts and debit and credit cards to international newcomers in the U.S. who lack Social Security numbers or established U.S. credit histories, enabling them to build credit from the start of their residency.

5 investors

Safely Finance offers installment payment options for renters and those relocating, allowing them to spread deposits and fees over time while helping property owners improve cash flow and reduce defaults.

1 investor

Sequence Bio discovers genetic causes of disease within Newfoundland and Labrador's founder population to develop breakthrough treatments, diagnostics, and preventions. The company focuses on translational biology and genetics research for patients globally.

3 investors

Shift provides AI agents that automate healthcare administrative and clinical workflows, including patient scheduling, billing inquiries, claims processing, and medical coding for healthcare providers and practices.

1 investor

Shiru uses AI and material science to discover natural proteins and ingredients for use in food, personal care, agriculture, and advanced materials, reducing traditional development timelines from 5-15 years to 1-2 years.

6 investors

Short Story designs and sells clothing made specifically for petite women, with sizes tailored to women 5'4" and under. The company was founded by petite women to address the lack of well-fitting fashion options for the petite market in the United States.

1 investor

Soteris provides real-time, policy-level pricing precision software for property and casualty insurers to optimize underwriting and pricing decisions. The platform helps insurers balance growth with profitability by identifying adequately priced risks and integrating into existing underwriting workflows.

2 investors

Souffle Club builds a professional network where user profiles are constructed from peer recommendations in specific skill or role contexts, replacing traditional resume-based profiles with a trust-based system across various expertise areas.

1 investor

Spice Data provides restaurant industry data and analytics to large enterprises. The company aggregates information about restaurants to support business intelligence and decision-making for corporate clients.

1 investor

spotLESS Materials develops nature-inspired liquid-entrenched smooth surface (LESS) coatings that repel liquids, sludge, and contaminants while enabling self-cleaning properties for industrial applications including sanitation, automotive, and medical sectors.

2 investors

Superorder provides AI agents for restaurants that manage customer reputation and feedback, maximize delivery profitability, and generate operational insights. The platform captures customer feedback through AI-driven surveys, automates review management, reconciles third-party delivery data, and surfaces actionable trends to drive operational performance.

5 investors

Swadesh provides financial services tailored for Indian immigrants and non-US citizens in the United States, offering banking products and financial inclusion services designed for their specific needs across different life stages.

1 investor