Hammock is building the first HSA/FSA that actually works for modern life — letting people spend pre-tax dollars on everyday wellness like the gym, recovery, and prevention. Backed by a16z Speedrun, and others.

Happenstance exists to create 10x more of this kind of luck in the world. Backed by Garry Tan and Elad Gil, we've built the world's best AI person search by a wide margin. No more keyword search; just describe the kind of person you're looking for. We're already used by 1000+ YC alums to accelerate their customer development, sales, and fundraising.

Happy Returns is solving one of e-commerce’s biggest pain points: returns. We combine proprietary returns software with reverse logistics, including box-free consolidated returns, to make returns better for shoppers, retailers, and the planet. We’re a UPS company, growing quickly, and our shopper experience has a 93 NPS.

At Happy Scribe we think audio & video should be universally accessible. We want to scale high-quality subtitles & dubbing with a multi-player editing experience that combines state-of-the-art AI with a global marketplace of proofreaders. 100% bootstrapped and profitable, we have a product used by +400k/mo users with high 7-digit revenue.

Hardfin is a B2B software platform for equipment manufacturers that enables them to track their assets and manage projects for their hardware.

We're building a regulatory intelligence platform for AI in healthcare. In effect a specialist dataset + search engine for that information. Currently working to get from a Beta to production ready.

Harmony Intelligence is building a defensive AI AppSec agent to protect mission-critical software from AI cyberattacks. They have recently raised $3M for this purpose.

HarperDB is an innovative software company that recently secured significant series A funding. HarperDB’s platform combines database, caching, application, and streaming functions into a single technology to improve performance and reduce costs for Fortune 100 companies.

Hartwig Medical Foundation is developing a diagnostic whole genome sequencing test for tumors to speed-up the uptake of personalized cancer treatments for patients in the Netherlands. They are building an algorithm that integrates molecular and clinical data to create comprehensive treatment reports.

The Harvard Library Innovation Lab is a software product studio and research lab embedded in the Harvard Law School Library, with a mission of bringing library principles to tech. They build software platforms like Perma.cc and the Caselaw Access Project; publish open source tools for access to knowledge; and host research fellows.