Y Combinator Spring 2025 (X25) Companies

Sygaldry develops quantum-accelerated AI servers that combine multiple qubit modalities to speed up training and inference for AI models. The company targets AI companies and researchers seeking more efficient, cost-effective compute infrastructure.

10 investors

Synthio Labs develops AI-powered synthesis and clinical interpretation systems for pharmaceutical interactions, offering text, voice, and video interfaces designed for healthcare professionals and patients that integrate FDA labels, drug mechanisms, and clinical literature.

1 investor

Tegore is an AI math tutor designed to help students learn mathematical concepts through personalized instruction. The tool is used by teachers in classrooms to support student learning in mathematics.

1 investor

Alfi is an AI assistant that lives within group chats across messaging platforms (iOS, Android, SMS, WhatsApp, Telegram) to organize plans, generate creative content, and suggest activities for friend groups. The service learns group preferences and handles logistics like booking reservations and coordinating schedules.

1 investor

A manufacturer of open-source hardware kits for robot learning and development, featuring all-in-one systems with manipulator arms, cameras, and cross-platform software support for AI research and robotics applications.

1 investor

Theorem.dev provides verified software engineering through lf-lean, an AI-powered translation tool that converts formal mathematical proofs from Rocq to Lean significantly faster than manual translation.

1 investor

Theta builds simulation environments and training infrastructure for AI agents specialized to perform enterprise workplace tasks. The company partners with enterprises and research labs to create custom agents that master domain-specific workflows, tools, and decision-making across domains like finance, back office operations, and software development.

3 investors

Third Chair provides music rights holders and IP investment funds with monitoring and licensing solutions for intellectual property use across social media platforms (TikTok, Instagram, X, Facebook, YouTube). The platform uses audio fingerprinting to identify unlicensed music uses, uncover monetization opportunities, and facilitate licensing revenue collection.

1 investor

Throxy provides outbound sales services as an alternative to managing multiple sales tools, hiring SDRs, or running outbound campaigns in-house. The company serves sales teams and organizations looking to streamline their outbound sales processes.

2 investors

Ticket Wallet is a platform that uses AI to automate ticket resale, offering dynamic pricing, multi-marketplace distribution, and automated transfers for individual and professional ticket sellers. The software handles pricing optimization, listing management across 8+ resale platforms, and payment processing with a single dashboard.

1 investor

Tinfoil develops secure hardware and systems, with expertise in privacy and security protocols.

2 investors

Trapeze provides an AI call center for healthcare organizations, offering 24/7 patient support through conversational AI for scheduling, inquiries, and triage. The platform integrates with existing healthcare systems to manage patient interactions and provides analytics on patient conversations.

1 investor

Units provides an alternative education model aimed at reimagining how students learn, positioning itself in opposition to traditional schooling structures. The company focuses on accelerating student learning and potential outside conventional educational systems.

1 investor

ValueMate auto-fills real estate appraisal forms from prior work history, MLS data, and field notes, then runs quality control before submission. The company offers bespoke QC engines, white-label platforms, and integrations built on its proprietary technology stack, or customers can order appraisals directly through its in-house appraisal firm.

1 investor

Vassar Robotics develops gearbox-free robotic arms with direct-drive actuators for robot learning and imitation learning applications. The company's actuators are designed to eliminate hysteretic artifacts in data and simulation, enabling better model transfer and fleet consistency.

1 investor

Vesence is a platform that enables teams to delegate complex work in Microsoft Office applications (Word, Excel, PowerPoint, Outlook) to AI agents. It preserves formatting and document structure while providing traceable edits and integration with enterprise systems like SharePoint and Teams, serving law firms, banks, and investment professionals.

1 investor

The Vision Lab creates high-density action labeling datasets for video and industrial data using proprietary vision language models combined with human annotation. The company serves machine learning teams building computer vision systems across biotech, manufacturing, and other industries.

2 investors

VoiceOS is a voice-controlled productivity platform that lets users control applications and complete tasks using voice commands instead of typing. It integrates with apps like Google Calendar and email to reduce context switching and manual steps for professionals and teams.

1 investor

Vybe builds AI coworkers and custom applications that automate repetitive operations tasks and integrate with existing team workflows through Slack and 3,000+ business integrations. The platform targets businesses of all sizes seeking to augment their teams with AI-powered agents for sales, support, operations, finance, and other functions.

3 investors

Waffle is a platform that allows creators to build and deploy AI chatbots that they can share with audiences via simple access codes. Users download the app and enter a creator code to interact with custom-built bots.

1 investor

Wavedash is a web-based gaming platform that runs games natively in browsers without downloads or installs, enabling instant multiplayer by sharing a link. It provides developer tools, hosting, distribution, and analytics for game creators across multiple engines, charging 10% fees.

2 investors

Willow is a voice-to-text application that transcribes and formats spoken words into written text across desktop and mobile devices. It serves professionals and knowledge workers across any app or device, using AI to handle formatting, punctuation, and style adaptation.

1 investor

Zeon Systems builds robotic infrastructure for scientific laboratories, enabling automation of flexible and adaptive experiments through perception, control, and manipulation capabilities. The platform serves research scientists and AI systems evaluating scientific tasks in physical environments.

1 investor