Y Combinator Spring 2026 (X26) Companies

Korso AI is a quantitative trading firm that develops data, measurement, and trading systems for financial markets. The company also offers open-source and beta products including Shepherd (agent coordination tool), programmatic trading APIs, and Korso Research (an AI-native research workspace).

1 investor

Kugel Audio develops text-to-speech software with natural voices in 26+ languages, built and hosted in the EU with GDPR compliance. The service targets developers building voice-enabled applications and offers sub-50ms latency with streaming integration.

1 investor

Kuli is an AI-powered tool for marketing teams that automates creator discovery, campaign analysis, and content monitoring. It searches across millions of posts to identify performance patterns, track competitor campaigns, and find similar creators based on aesthetic and audience fit.

1 investor

Lab0 provides an AI forward-deployed engineer that automates enterprise software implementation across platforms like ServiceNow, SAP, Salesforce, and Workday. The system runs discovery through go-live for enterprise software deployments, compressing implementation timelines from months to weeks.

1 investor

Lamina Labs operates Simi, a tool that converts presentations, documents, and text prompts into whiteboard explainer videos using AI.

2 investors

Lattice provides monitoring and compliance oversight for clinical AI models running in hospitals. The platform detects model drift, fairness issues, and silent updates across multiple vendor AI systems, delivering cryptographically signed daily reports to hospital leadership without requiring access to patient data.

1 investor

Light Anchor builds AI-run companies that scale through computational efficiency rather than team growth, focusing on AI agents for customer experience.

1 investor

Lightsprint is an AI-native platform where developers, product managers, and designers plan, build, and ship software together using parallel cloud agents. It works with existing codebases and integrates with GitHub, Linear, and Slack to streamline the full software development lifecycle from requirements to production.

2 investors

Limrun provides cloud-hosted iOS and Android simulators integrated with Xcode for AI agents and development teams to build, test, and validate mobile applications. The platform enables remote builds, real-time feedback, and demo sharing without local setup.

1 investor

A tool that runs in the terminal and detects when interactive prompts stall execution in development workflows, providing visibility into file operations and enabling remote redirection without SSH access.

1 investor

Lumius develops a 3D ultrasound device designed to provide fast, smart, and accessible imaging capabilities. The device functions as a 3D camera for internal body visualization, serving the medical imaging market.

1 investor

Madrone provides cooling solutions for data centers using an alternative thermodynamic process that reduces power and water consumption without mechanical chillers. The company serves hyperscale data center operators seeking to improve energy efficiency and maximize compute density.

1 investor

Manicule helps AI agents discover and use software products by optimizing documentation, code examples, and content distribution. The company provides documentation audits, information architecture, content creation, and monitoring to ensure products are discoverable and usable by AI agents and developers.

1 investor

Maquoketa develops drone systems and software for autonomous flight operations, including computer vision, ground control systems, and mechanical engineering. The company serves customers requiring aerial robotics and autonomous systems capabilities.

1 investor

Memoir is an AI-powered platform that extracts context from product changes, customer conversations, and market signals to generate launch assets, marketing content, and campaign materials. It helps product and marketing teams accelerate go-to-market velocity by automating the creation of launches, posts, pages, and sales materials based on real product and customer data.

1 investor

Memory Store aggregates conversations, meetings, and notes from tools like Slack, Fathom, and Granola into a searchable knowledge base accessible to AI agents like Claude. The product organizes work context by project, person, and decision to serve teams and individuals seeking centralized institutional memory.

1 investor

Minicor provides a platform for building and running desktop automations using computer use agents that can reliably interact with legacy applications lacking APIs. The service targets AI companies and enterprises in healthcare, automotive, logistics, and financial services that need to read and write data to systems of record.

1 investor

Miso Labs develops foundational AI models for voice agents with ultra-low latency (110ms) and voice cloning capabilities. The company serves developers and enterprises building conversational voice products.

1 investor

Mochatrade provides perpetual futures contracts on US stocks to traders globally, offering leverage of up to 20x and access to 50+ stocks through a self-custodial platform that does not require a traditional US brokerage account. The service accepts deposits in local currencies and targets traders in markets like India with alternative access to major US equities.

1 investor

Modern builds a platform to replace legacy IT Service Management (ITSM) software for enterprise IT teams, enabling faster ticket resolution, instant approvals, and auditable decisions.

1 investor

Mount provides security scanning, remediation, and insurance coverage specifically designed for AI agents and autonomous systems. The platform identifies vulnerabilities in deployed AI systems in real time and offers automated fixes plus active insurance protection against AI-specific operational and regulatory risks.

1 investor

An AI-powered food journal application that personalizes nutrition guidance based on individual health goals and lifestyle constraints rather than generic calorie-tracking recommendations.

1 investor

Netter.ai provides a market intelligence platform that reconciles sell-in and sell-out data across retail channels, enriches it with geographic and demographic signals, and delivers live SKU-level forecasts. The platform serves consumer goods brands and retailers seeking real-time visibility beyond traditional weekly reporting.

2 investors

Nine Fives develops RF (radio frequency) test equipment for hardware engineers. The company focuses on delivering simple, easy-to-use testing equipment backed by a 30-day money-back guarantee and 2-year warranty.

1 investor