Y Combinator Spring 2025 (X25) Companies

Bond builds an AI chief of staff application for executives and CEOs to manage their workflows, communications, and priorities across fragmented tools and information sources.

2 investors

Boost Robotics builds autonomous robots that inspect and maintain data center infrastructure. The company serves data center operators to ensure continuous facility operations.

1 investor

Bramante Bio manufactures AI-driven robotic instruments and reagents for life sciences research and manufacturing. The company designs hardware that integrates with modern software stacks and provides direct engineering support.

1 investor

Cactus automates lead response and customer re-engagement for home service businesses, ensuring calls are answered within 60 seconds and dormant CRM contacts are converted into repeat bookings.

1 investor

Capacitive provides a data access layer that connects AI agents to internal company information, offering role-based access controls and security monitoring across multiple platforms.

2 investors

Cartpole develops simulation environments designed to train advanced machine learning models using reinforcement learning techniques.

1 investor

Cascade Space develops software tools and infrastructure for designing, building, testing, and operating spacecraft communication systems. The company serves aerospace and space companies seeking to accelerate development with reduced team requirements.

3 investors

Casco provides autonomous security testing that continuously scans code for vulnerabilities, replacing traditional once-yearly penetration testing. The platform targets fast-growing companies and enterprises seeking faster, high-quality security assessments without false positives.

2 investors

Caucus provides workflow automation and system integration tools designed for government agencies to automate repetitive administrative tasks and reduce case resolution times.

1 investor

Chestnut Mortgage uses AI to automate document review, loan processing, and comparisons to reduce costs and timelines for residential mortgage borrowers. The company operates as a licensed mortgage lender in Texas and Colorado, typically closing loans in 2-3 weeks with rates approximately 0.5% lower than industry standards.

3 investors

Project Chiron provides active, experimental math education for students. The company was founded by Oxford math graduates who believe math learning should be hands-on and exploratory rather than lecture-based.

1 investor

chrt is a logistics platform for time-critical shipping that provides real-time tracking, dispatch management, and proof-of-delivery capabilities for shippers, freight forwarders, and couriers. The platform integrates multiple carriers and drivers into a single dashboard, with features including route optimization, customizable alerts, IoT trackers, and automated billing.

1 investor

Claim Health provides revenue operations software for home-based care agencies, automating claims management, authorization tracking, and financial visibility to reduce claim denials and administrative overhead.

1 investor

Clarm Atlas is a no-code platform that enables business teams to build and deploy autonomous AI agents from approved internal sources, tools, and compliance rules for operational workflows. It serves operations, compliance, and customer-facing teams at banks, healthcare providers, and public companies with built-in audit trails and governance controls.

2 investors

WhoDB is a platform that lets teams define their organizational entities, relationships, and decision rules, then automatically evaluates those decisions against incoming operational data to produce actions and recommendations. The system provides full transparency and auditability of data models and decision logic without requiring custom dashboards or ad-hoc queries.

1 investor

Code Four develops AI-powered investigation software for police departments that automates evidence processing and fuses data from body-worn cameras, records management systems, phone dumps, recorded audio, and case files. The platform extracts entities, builds timelines, and generates investigative documents to accelerate criminal inquiries.

1 investor

Cohesive is a sales automation platform that identifies, reaches, and follows up with local service businesses through email, SMS, and phone using AI agents. It serves service businesses like HVAC, plumbing, roofing, and landscaping that sell to property managers, homeowners, and commercial facilities.

1 investor

Combinely develops AI automation software for accounting firms to reduce manual work and enable accountants to focus on high-value activities like strategic guidance and client relationships. The platform aims to help accounting practices scale their professional services without proportional increases in headcount.

1 investor

Cotool builds infrastructure that enables security teams to operate at machine speed through AI agents, automating security investigations and detection logic to close the loop between threat detection and response.

3 investors

Crimson uses AI to automate document review, evidence sorting, and case file organization for litigation and arbitration teams. The platform is designed to free lawyers from tedious administrative tasks so they can focus on case strategy and advocacy.

1 investor

Cua provides open-source infrastructure and cloud sandboxes for AI agents to run on desktop operating systems (Linux, Windows, macOS, Android). The company serves developers and researchers building computer-use agents.

2 investors

cubic is an AI-powered code review tool that integrates with GitHub and IDEs to catch bugs, enforce coding standards, and identify security issues. It learns from senior developers' patterns and runs automated scans to find and suggest fixes for code vulnerabilities across multiple programming languages.

2 investors

Den builds AI agents that learn from individual conversations and can respond to messages on behalf of their owners via text or phone. The product targets individuals who want a digital representation that can handle communications when they are unavailable.

2 investors

Docket automates complex testing workflows with pixel-perfect precision by capturing on-screen coordinates, enabling testing of canvases, iframes, popups, and non-standard elements that traditional testing tools cannot handle.

1 investor