Y Combinator Summer 2026 (S26) Companies

Billow is an AI/ML platform designed for regulated industries. The company serves enterprise clients in sectors such as financial services, energy, and life sciences.

1 investor

Bizmark provides AI intelligence systems for business processes, applied to real-world operational needs.

1 investor

Blaise is an AI system that handles the scoping, development, and deployment of enterprise software from start to finish. It serves businesses looking to build custom software applications.

1 investor

Bloomy is an adaptive learning platform that uses AI to teach ELA, Math, and Writing to K-12 students through personalized lessons, live AI tutoring, and mastery-based assessments. The platform serves schools and districts seeking differentiated instruction grounded in learning science.

1 investor

Buildbox is a platform that detects failed user journeys in AI agents that pass their evals but still fail to help users complete tasks, ranking these failures by business impact. It ties agent failures to outcomes and tests alternative agent behaviors against the same customer task before release.

1 investor

Care GP develops AI-powered automation tools for Australian general practitioner clinics, automating administrative workflows including document management and phone/booking services. The company serves clinic operators seeking to reduce operational costs and overhead.

1 investor

CarSignal is an AI-based all-in-one operating system for auto repair shops, covering intake, diagnostics, estimates, scheduling, and payments in a single workspace. It includes a diagnostic copilot with OEM-grounded reasoning, customer-ready estimates, and live status pages, serving independent and multi-location shops across the US.</parameter> <parameter name="founders">[]

1 investor

Caution is a verifiable confidential compute platform that deploys sensitive workloads to secure enclaves and provides cryptographic proof that production code matches the reviewed source, build, and configuration. It currently runs on AWS Nitro Enclaves and serves high-assurance workloads such as AI model serving, healthcare data, key management, and blockchain node operation.

1 investor

Cerenovus unifies scattered corporate data—documents, emails, spreadsheets, chat messages—into a knowledge graph that both people and AI can query, then analyzes organizational workflows to surface operational inefficiencies and recommend improvements for executive decision-making.

1 investor

Chromie is an AI workspace for government contractors to find, qualify, and pursue federal and SLED (state, local, education) contract opportunities. It monitors SAM.gov and SLED portals, scores solicitations against a company profile, predicts recompetes, extracts solicitation requirements, and tracks pursuits through award.

1 investor

Coach is an AI coaching tool for in-person field sales reps that records and analyzes customer conversations to give each rep personalized feedback and one skill to improve at a time. It helps managers prioritize coaching and surfaces team-wide trends, serving field sales teams in retail, home improvement, door-to-door, alarm systems, and roofing.</parameter> <parameter name="founders">[]

1 investor

Coasty provides AI agents that automate healthcare revenue cycle tasks like eligibility verification, prior authorization, claim submission, and denial management by performing repetitive work across EHRs, practice management systems, and payer portals through screen interaction. The platform is designed for healthcare billing teams and operates within customer environments with full audit trails and approval gates for payer-facing submissions.

1 investor

Codag compresses infrastructure logs into concise text patterns so AI agents can debug faster and more efficiently. The tool integrates with coding assistants like Claude Code and other LLMs to reduce token consumption while preserving actionable log context.

1 investor

Computable operates a marketplace for buying, selling, and redeeming GPU compute hours by calendar week, offering wholesale pricing, standing buyback quotes, and the ability to lock in future capacity at a set price. It targets teams and buyers who need flexible GPU cluster access for defined time periods, using a sealed-bid auction model.

1 investor

Conifer provides a routing system that runs large language models locally on user machines first, then intelligently routes queries to cloud models only when needed, reducing token costs and improving inference speed through optimized GPU kernels.

2 investors

Context provides an API that extracts brand color palettes from any domain, returning structured color data with HEX values, RGB/HSL support, and usage weights for developers and product teams building dashboards and marketing tools.

1 investor

Control Seat designs, builds, and deploys industrial control and monitoring systems including PLCs, SCADA, networking, and analytics on a modern AI-native platform. The company serves manufacturers and industrial operators with faster deployment and lean-running systems that improve over time.

1 investor

Cosmic Robotics develops autonomous construction equipment for critical infrastructure projects, starting with solar installations.

4 investors

Cova provides home care services, matching caregivers with families and patients while managing insurance billing, enrollment, and administrative tasks across Medicaid, private pay, and long-term care plans. The platform pays caregivers competitively and reduces overhead to make quality care affordable for families.

1 investor

Daqstra builds software infrastructure for observability and orchestration of physical systems, enabling teams to manage data acquisition, configuration, and real-time operations from test environments and hardware deployments. The platform serves engineering teams operating test cells, propulsion systems, and other physical infrastructure that require unified data management and monitoring.

1 investor

Datoric sources and licenses ethically obtained voice, video, and multimodal training data for frontier AI development, working directly with consented, compensated contributors such as native speakers and domain experts. Each dataset carries verifiable provenance and clean licenses aimed at AI model teams building multimodal systems.

1 investor

Decawork provides an operating layer for IT teams to deploy, govern, and maintain AI agents running across a company's systems. It handles agent identity, scoped access to internal systems, spending caps, approval gates, and audit records so agents stay controlled from onboarding through audit.

1 investor

Definite provides continuous automated compliance and reconciliation software for bank controllers, verifying general ledger ties, regulatory filings (Call Reports, 5300s), lending limits, and HMDA/capital checks as data arrives rather than at quarter-end.

1 investor

Denta embeds AI engineers into dental organizations to automate business operations and administrative processes using AI. The company serves dental practices and healthcare organizations seeking to reduce dependence on traditional software systems.

1 investor