YC Spring 2025 Engineering, Product and Design Startups

Y Combinator's Spring 2025 batch included 24 Engineering, Product and Design startups. Of these, 24 remain active, 0 have been acquired, and 0 have shut down.

• Mesmer (7 people) — The operating system for the 100x Engineering Team
• Plexe (2 people) — Open-source agents to build predictive ML models from a prompt
• Vybe (8 people) — Secure internal apps. Built by AI in seconds. Powered by your data.
• cubic (3 people) — AI-powered code review platform
• Cua (3 people) — Give every agent a cloud desktop
• Feyn (3 people) — Custom models trained on your data
• HelixDB (6 people) — The fastest & most scalable graph-vector database on the market
• Alpha Research (1 people) — Open source, agentic knowledge bases for all of humanity's knowledge.
• Attune (3 people) — Faster builds, zero effort.
• Freesolo (4 people) — Product Native Models
• StarSling (2 people) — Self-Driving CI
• Theorem (4 people) — Program verification so even your systems engineers can vibecode
• Godela (10 people) — AI Physics Engine to replace simulations and prototypes
• Docket (2 people) — AI agents for web testing
• Prism (3 people) — Deploy AI Agents with a Single API Call
• Photonium (4 people) — AI-Powered Optical Consulting & Software
• Capacitive (2 people) — The data gateway for agents.
• Jeevy Fabrication (3 people) — AI Driven EPC - Weld Fabrication Contractor
• Bloom (2 people) — Build and share mobile apps in seconds
• Human Behavior (3 people) — Understand your users beyond the numbers
• Partcl — Design a chip in minutes
• Refresh (8 people) — Training gyms for computer use and software engineering work
• Alkali (2 people) — The smarter way to estimate steel.
• Nimbic AI (3 people) — Automatically write and update internal docs with every code commit.