Y Combinator Summer 2025 (S25) Companies

Channel3 provides an API that organizes product data for AI agents to search, recommend, and purchase products. The platform serves both developers building AI shopping experiences and brands seeking distribution across AI-powered commerce channels.

3 investors

Char is a note-taking and task management app that uses AI to synthesize information from notes, meetings, tools, and tasks into a daily briefing, and automates task routing and follow-ups for individual knowledge workers.

1 investor

Clodo is a people sourcing platform that uses natural language search to find and enrich targeted individuals for recruiting, sales prospecting, and expert networking. The platform serves recruiters, sales teams, and expert networks seeking to identify specific personas using AI-powered search across the open web and proprietary datasets.

1 investor

Closera provides an AI-powered personal shopping agent for e-commerce stores that recommends products and bundles to increase customer conversions and average order value. The platform serves online retailers seeking to optimize their sales performance through AI-driven recommendations.

1 investor

Cocreate is a software tool for video post-production professionals that automates editorial workflows by reading slates, syncing audio, detecting multicams, building stringouts, and generating Premiere or Avid projects. It serves editors, DITs, post supervisors, and production managers in film and television production.

3 investors

Comena is an AI platform that automates B2B order entry and quotation processing for distributors and manufacturers, extracting data from emails and documents directly into ERP systems. The platform handles order capture, item matching, and purchase order confirmation for industrial and wholesale businesses.

1 investor

ContextFort provides kernel-level monitoring of AI coding agents (like Cursor and Claude Code) running on engineers' machines, tracking file access, network connections, and subprocess activity to audit what agents do and ensure visibility into their actions.

1 investor

Convexia provides AI-powered drug discovery and evaluation software that scans global sources for overlooked drug assets and runs deep in silico simulations across 50+ models to assess binding, toxicity, pharmacokinetics, and immunogenicity. The platform combines AI agents with expert human review to accelerate drug asset evaluation for biotech companies, pharma firms, and venture investors.

1 investor

Costream creates indexes of conversations that occur within digital products, making human dialogue searchable and accessible.

1 investor

Cyberdesk provides a developer toolkit for automating desktop applications, particularly legacy systems like EHRs and ERPs, serving developers in healthcare, finance, logistics, and related sectors.

1 investor

Datafruit captures and structures discovery conversations, decisions, and assumptions from calls and documents to create a traceable system of record for system integrators and services teams. The platform helps teams organize scope, estimation, and project handoff while preserving institutional knowledge.

1 investor

Dedalus Labs provides virtual machines that boot in 250ms with Linux isolation, persistent storage, and scale-to-zero billing. The platform serves developers and infrastructure teams needing fast, isolated compute with pay-only-when-running economics.

5 investors

Silicon Valley Robotics Center is a full-stack robotics infrastructure provider offering hardware procurement, data collection, AI training, and fleet teleoperation services for robot learning and deployment. It serves academic labs, startups, and enterprises developing physical AI systems.

1 investor

4 investors

Design Arena is a platform that evaluates and ranks AI models' design and UI generation capabilities through crowdsourced pairwise comparisons. Users vote on anonymized outputs from competing models to build community-driven leaderboards of AI performance.

1 investor

Doe is an AI platform that enables employees to delegate work to AI agents that execute tasks across company systems and knowledge bases. The platform provides enterprise-grade infrastructure for multi-agent collaboration with built-in governance, security controls, and human oversight.

1 investor

Duranium develops reactor technology that modernizes carbochlorination metallurgy to produce titanium, magnesium, aluminum, zirconium, and hafnium with reduced emissions and lower costs while securing critical minerals for U.S. manufacturing independence.

1 investor

EffiGov provides AI phone agents for government departments that handle resident inquiries 24/7, answering calls, logging issues, and routing complex requests to staff. The platform serves local government agencies across multiple states.

1 investor

Embedder is an AI platform that automates firmware development for embedded systems and hardware, serving semiconductor, IoT, medical device, automotive, aerospace, and industrial automation teams. The platform reads datasheets, writes and tests firmware, and diagnoses hardware issues to accelerate product development cycles.

1 investor

Epicenter builds a local-first, open-source platform for knowledge workers that uses plain text files and SQLite as a shared data substrate across multiple applications including transcription, note-taking, and AI querying tools. The platform is designed for individuals and developers who want to own their data, avoid cloud lock-in, and integrate with existing tools like Obsidian, VS Code, and language models.

1 investor

F2 is a private markets intelligence platform that helps investment firms leverage their institutional knowledge to screen, diligence, underwrite, and monitor deals more efficiently.

6 investors

F4 is a platform for analyzing, validating, and visualizing GD&T (geometric dimensioning and tolerancing) in engineering drawings. It serves industrial teams including manufacturers, aerospace, and defense organizations by automating the interpretation of design files from CAD platforms and generating compliance reports.

1 investor

Finto is an AI platform that automates invoice processing for enterprises, handling data extraction, validation, approvals, and ERP integration with full auditability. It is built for enterprise finance teams and emphasizes GDPR compliance and data privacy without LLM training on customer data.

1 investor

Flai is an AI communications platform that handles incoming calls, SMS, and email for automotive dealerships, answering customer inquiries, scheduling appointments, and qualifying leads 24/7. The platform integrates with existing dealership systems to automate routine customer engagement while enabling human staff to focus on closing deals.

2 investors