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Harbor

Active · AI-native CRO for clinical trial operations

8signal of 100 · rising 8
  • went through YCProgram · this site+4
  • team of 4Team size · YC's directory+3.6

A sum of public facts, not a judgement and not investment advice.

Competitors

Adjacent

Also from X26 in AI

All of X26

Founders

  • Albert CaiFounder/CEO
  • Nathan H. LeungFounder/CTO

About Harbor

Harbor is building an AI-native contract research organization (CRO) for clinical trials. We started with an AI-native system of record for clinical trial data (electronic data capture system), grew the software business to seven trials and ~$187k in contracted software revenue over the next twelve months, then expanded into full-service trial execution and signed our first CRO contract worth $1.93M over three years. Clinical trials consume 45% of all new drug and device development spend. While some of that goes to software, sites, and patients, the largest line items are services: project management, monitoring, data management, site coordination, source verification, query resolution, record reconciliation, and analysis. Today, drug and device companies outsource clinical operations to legacy CROs and their massive teams, which is why the CRO market is $82B annually. Harbor delivers the regulated services companies buy from legacy CROs, but built around our AI-native system of record from day one. Our software already automates the core data workflows: study build, data capture, query generation, monitoring, signing, and database lock. Because we own the system of record, we can expand into the surrounding service workflows: site contracting and billing, subject engagement and retention, statistics, reporting, and more. We built Harbor because we lived through the problem. Albert spent four years in clinical trials and regulatory strategy at a medical device startup, taking an unproven wearable from first-in-human trials to FDA authorization. Nate brings the technical depth, having built scalable software at Google and Ramp and served as employee #1 at a previous YC startup.

YC batch
X26 · Spring 2026
Status, per YC
Active
Category
AI, Data
Team size
4
Location
San Francisco, CA, USA
Founded
2025
Checked
6h ago

Changes seen

Team sizeOct 19, 2026

Team went from 3 to 4 people.

Harbor in X26: 194 companies, 84% AI

LinkedIn

Harbor: questions

Which YC batch was Harbor in?

Harbor was in Y Combinator's Spring 2026 batch (X26).

Is Harbor still active?

Y Combinator lists Harbor as active.

Who founded Harbor?

Harbor's founders, as listed on its YC page: Albert Cai (Founder/CEO), Nathan H. Leung (Founder/CTO).

Where is Harbor based?

Harbor lists San Francisco, CA, USA as its location on YC's directory.