Y Combinator (YC)

Cloud infrastructure for building and testing software through continuous integration workflows.

Greptile builds an AI code-review and validation platform that checks software changes against the context of a team’s codebase.

ByteAsk develops AI coding agents for engineers working on C and C++ software in demanding industrial and technical environments.

A web-data API that turns websites into structured data for developers building AI applications and agents.

Fast GitHub Actions runners paired with AI agents that optimize continuous integration workflows.

A monitoring and reliability platform that detects failures in production AI agents, investigates their causes and helps developers prevent repeats.

AI agents that automate software testing and help teams improve application quality.

AI video-creation software that helps creators, businesses and teams turn briefs or source media into editable, localized videos.

ZeitMind connects mid-sized companies' ERP, CRM, HR and other systems, prepares their data and turns plain-language business questions into traceable reports, dashboards and applications.

Open-source healthcare data infrastructure unifying patient records for clinicians

Thunder Compute virtualizes GPUs so multiple workloads can share capacity and data centers can use existing hardware more efficiently.

AI agents that map, document and modernize legacy COBOL applications.

A machine-native browser engine that turns websites into structured workflows AI agents can execute.

Lemma monitors AI agents in production and surfaces semantic failures that ordinary system metrics can miss.

Cloud infrastructure for building and testing software through continuous integration workflows.

Naïve provides the accounts, tools and runtime infrastructure that AI agents need to operate business workflows.

Intelligent email inbox that prepares work proactively

AI software creation platform for building full-stack, production-ready web and mobile applications

Ollama provides tools for developers to use open AI models.

AI-native observability platform for fast-moving engineering teams

Provides evaluation platform for voice AI quality

Provides voice AI for complex, high-stakes conversations

Provides an open source Postgres platform with databases, authentication, storage and application backend services.

AI-native filmmaking platform giving creators cinematic control to direct AI-generated films

AfterQuery creates specialist datasets and reinforcement-learning environments for AI labs and enterprises.

Open-source observability platform for tracing and debugging long-running AI agents

Provides AI-powered automation tools for non-technical employees to build and deploy autonomous agents

Provides AI-powered development platform for software creation and deployment

Develops AI agents to automate security testing and remediation across the development lifecycle

Builds workflow orchestration systems to provide context for AI agents in enterprises