What they do:
Find what's losing you customers and money in your AI agent and fix it
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HQ: San Francisco, CA, United States
Y Combinator Fall 2025 Startups
This list has 145 startups and was last updated on Oct 15, 2026. 54 of them are hiring right now. Biggest hubs: San Francisco (91), New York (17), and London (5). Largest teams: Icarus, Uplane, and Brickanta.
145 startupsPage 4 of 5
What they do:
The Routing Layer for AI Agents
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HQ: San Francisco, CA, United States
What they do:
Lunavo is the AI assistant for carriers.
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HQ: Germany
What they do:
TikTok for Sports Trading
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HQ: San Francisco, CA, United States
What they do:
AI agents on real phones, growing brands across every platform.
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HQ: Austin, TX, United States
What they do:
Identify churn risk and stay close to users at scale
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HQ: San Francisco, CA, United States
What they do:
AI Tax prep and accounting software for CPA firms
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HQ: San Francisco, CA, United States
What they do:
Delivering AI-powered situational awareness in tactical environments.
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HQ: San Francisco, CA, United States
What they do:
The sensitive data redaction layer for AI
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HQ: San Francisco, CA, United States
What they do:
AI Agents for Platform Engineering
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HQ: San Francisco, CA, United States
What they do:
A proactive desktop copilot. Clippy, but actually good.
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HQ: San Francisco, CA, United States
What they do:
AI language buddy in the games kids love
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HQ: San Francisco, CA, United States
What they do:
Automatic Construction Drawing Clash Detection
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HQ: New York, NY, United States
What they do:
The coding agent that actually collaborates with you
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HQ: San Francisco, CA, United States
What they do:
Institutional liquidity across prediction markets
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HQ: San Francisco, CA, United States
What they do:
Code and browse in the same place
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HQ: San Francisco, CA, United States
What they do:
The first platform where families can create AI cartoons in minutes
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HQ: San Francisco, CA, United States
What they do:
The first Agentic platform for Oncology
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HQ: San Francisco, CA, United States
What they do:
AI Legal OS
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HQ: Los Angeles, CA, United States
What they do:
The cloud platform built for coding agents
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What they do:
AI support done right
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HQ: San Francisco, CA, United States
What they do:
The Marketplace for Complex Hobbies
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HQ: San Francisco, CA, United States
What they do:
Real-time web intelligence API for AI agents and GTM teams
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HQ: San Francisco, CA, United States
What they do:
Canva for short-form video ads
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HQ: San Francisco, CA, United States
What they do:
Infra to build your own software factory
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HQ: New York, NY, United States
What they do:
AI plug-in that automates HR immigration screening and compliance
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HQ: San Francisco, CA, United States
What they do:
Powering tomorrow's industrial revolution in space
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HQ: San Diego, CA, United States
What they do:
A robotics intelligence system for metal fabrication
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HQ: San Francisco, CA, United States
What they do:
Accelerated Physics Kernels for Computational Engineering
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HQ: San Francisco, CA, United States
What they do:
General Purpose Robots
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HQ: San Francisco, CA, United States
YC F25Early stage
What they do:
Explore dozens of design directions with your agent
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HQ: San Francisco, CA, United States
YC F25Early stage
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HQ: San Francisco, CA, United States
Remedy
Acquired
What they do:
AI Agents for Pharmacies
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Rovr
Shut down
What they do:
AI FDE Engine that runs your engineering workflows
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HQ: San Francisco, CA, United States
Sylvian
Shut down
What they do:
Specialized AI Agents.
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HQ: San Francisco, CA, United States
Dome
Shut down
What they do:
A unified API for prediction markets, like Kalshi and Polymarket
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