Y Combinator Summer 2025 (S25) Companies

Fleetline develops software that assigns shipments to trucks and drivers for trucking companies, using optimization algorithms combined with language models to account for regulatory constraints, customer requirements, driver preferences, and real-world operational exceptions.

1 investor

Floot is a no-code AI app builder that enables users without coding knowledge to create fully functional mobile and web applications by describing their requirements. The platform includes built-in database, backend infrastructure, authentication, hosting, and integrations with third-party services.

1 investor

Flywheel AI provides remote operation systems for excavators and construction equipment, enabling operators to control multiple machines or sites from a distance while improving site safety and productivity.

2 investors

Freya is an AI-powered voice platform that manages inbound and outbound customer service calls in multiple languages, with applications in sales, support, debt collection, and appointment scheduling. The platform integrates with existing CRM and telecommunications systems to automate high-volume call operations while maintaining regulatory compliance.

2 investors

Frizzle builds an AI-powered grading system that provides step-by-step feedback to students, freeing teacher time for instruction. It serves classroom teachers and private tutors in K-12 education.

1 investor

Fulcrum Research is a lab that develops methods and tools to elicit better outputs from AI models and measure their capabilities, particularly on difficult-to-verify tasks. The company works with organizations seeking to optimize agent performance on complex applications.

1 investor

GetASAP supplies same-day fresh produce to restaurants and retailers, powered by AI-driven demand forecasting and freight brokerage technology. The platform combines produce sourcing with automated logistics, freight rate negotiation, and demand intelligence to reduce waste and optimize supply chain operations.

1 investor

GhostEye provides continuous employee security assessments and automated testing to identify vulnerabilities to social engineering attacks, helping organizations address exposures before they result in breaches.

1 investor

Golpo Video is an AI-powered tool for creating whiteboard explainer videos from prompts or documents. The platform targets content creators and professionals who need to produce video content efficiently.

1 investor

Halluminate provides reinforcement learning environments for financial services firms to train frontier AI models on workflows in investment banking, private equity, and consulting.

3 investors

Hera is an AI-powered motion design tool that generates animated videos from text descriptions. It serves creators and marketers who need to produce product launch videos and other promotional content.

1 investor

Humoniq provides customer support solutions for travel companies, offering 24/7 multilingual service and deep backend integrations to replace inefficient phone systems and chatbots.

3 investors

Idler develops training environments for reinforcement learning that enable AI models to learn programming through simulation of real-world coding tasks.

1 investor

Imprezia builds an intent exchange platform for AI systems, enabling real-time, intent-aware interactions. The platform serves as infrastructure for managing AI system interactions and economic activity.

1 investor

Interface researches how information is structured for AI agents and develops transaction platforms for them, including OneStop, a marketplace aggregating AI services.

2 investors

Interfere is a real-time monitoring platform that helps engineers detect and understand bugs and issues in production applications before users encounter them, providing root cause analysis and suggested fixes.

3 investors

IronGrid provides foundation model-based software for industrial teams to assess risk and quality, with a focus on battery and energy storage systems. The platform helps teams identify quality issues, quantify uncertainty, and make more informed decisions in manufacturing and energy applications.

4 investors

IronLedger automates accounting workflows for property managers, developers, and contractors in the real estate sector. The platform handles expense management, invoice processing, and month-end close processes to reduce manual accounting work for multifamily properties.

1 investor

Janet AI provides AI-powered task tracking and project management software that autonomously captures, organizes, and updates team tasks from communication channels and drafts code changes. It serves software development teams seeking to reduce manual project board management.

1 investor

Juxta develops a UPS (positioning system) that enables real-time location tracking and coordination for organizations across industries including defense, logistics, and manufacturing. The platform helps improve reliability, safety, and operational visibility for factories, field operations, and healthcare settings.

4 investors

Kalinda provides AI-powered document analysis software that extracts and aggregates data from medical, financial, and employment records to help class action law firms evaluate case eligibility and process plaintiff claims more quickly.

1 investor

Kernel provides infrastructure built on unikernels that enables AI agents to access and interact with the internet through web browsers, featuring fast startup times, stealth capabilities, session persistence, and comprehensive logging for developers.

2 investors

Knowlify converts documents, blog posts, and ideas into narrated, animated videos for corporate teams. The platform serves compliance training and LMS use cases, offering both self-service video creation and full-service production.

1 investor

Lanesurf provides an AI agent that automates carrier outreach and freight booking for logistics companies, handling load sourcing, rate negotiation, and booking management integration with existing TMS platforms.

2 investors