Discover the next generation of startups.

Ooak Data

YCombinator

We build the world's largest library of real-world business workflow…

The promise of AI agents is still unmet in complex, real-world business environments. Our mission is to make it possible for agents to reliably accomplish concrete and useful tasks. That’s why we're building **Alexandria,** the world's largest library of real-world business workflow datasets.

Opalite Health

YCombinator

Helping Healthcare Providers Speak Any Language

Opalite makes it easy for healthcare providers to communicate with non-English speaking patients. We’re built to work inside existing clinical workflows, so providers can communicate in real time without waiting for an interpreter or delaying care. Opalite is available instantly, 24/7, and replaces traditional interpretation services with software that’s more reliable and saves millions of dollars per year. We've built a voice AI system that is the safest, most compliant, and most accurate medical interpreter in the world.

OpenCurriculum

YCombinator

Helping K-12 teachers and school administrators build awesome…

A library of community curated teaching and learning materials, free to the entire world. Come collaborate; we can teach better together. OpenCurriculum, Inc. is a California based technology nonprofit organization with a mission to bring openness and innovation to K12 education around the world

OpenInvest

YCombinator

Values based personalization at scale for asset and wealth management

OpenInvest is the first technology-backed, socially responsible investment asset management platform that aligns your investments with your values. OpenInvest’s proprietary technology seamlessly creates low-cost investment portfolios tailored to your values, while tracking market indices. A mission-driven company, OpenInvest was one of the first VC-backed Public Benefit Corporations.

Opennote

YCombinator

The notebook that thinks with you.

Opennote is a notebook with an AI thinking partner built in. Feynman lives in your work: it edits your writing, references your knowledge and the web, runs background tasks, and gives feedback as you work.

OpenProse

YCombinator

An open-source operating system for reliable long-running agents

OpenProse is building open-source infrastructure for long-running AI work: a declarative language plus the Reactor harness/runtime for reliable agent workflows. Our organic open-source traction (7k+ installs) has already translated into a customer at a medical research lab, starting with a $10k pilot set to roll into a $10k/month contract. YC recruited us into the current batch and we've since hired two senior founding team members (ex-Google, Forbes 30u30 harness engineer). All three founding team members are two time founders. We've raised $1.25M in the last two weeks from Jonathan Abrams 8-Bit Capital, Otis Chandler, and other angels.

OpenRelay

YCombinator

Distributed, hardware-agnostic AI inference

OpenRelay is an innovative startup in the tech space.

Openroll

YCombinator

The AI workforce for People and Finance teams

Openroll is an AI-powered workspace for people and finance teams. Openroll lets teams automate recurring work and run fully auditable workflows across their systems. Compensation, headcount, and budgeting in one platform. Learn more at https://www.openroll.com

OpenSpec

YCombinator

Plan mode for complex features

OpenSpec is an open-source, spec-driven framework. We help developers plan complex features by creating lightweight spec documents that serve as durable context for their coding agents. With 20k+ GitHub stars, we’re one of the leading spec-driven frameworks, used by thousands of developers and teams to plan and ship with the coding agent of their choice. Our philosophy is simple: keep planning lightweight and iterative, and match how software actually gets built, messy, evolving, and real, without dragging teams into rigid, bureaucratic workflows.