Y Combinator Summer 2023 (S23) Companies

Silimate builds AI-powered EDA software that accelerates chip design workflows by combining fast computation engines, machine learning models, and user-friendly interfaces. The platform serves SoC and IP companies in hardware design by functioning as a copilot to help chip designers understand design tradeoffs and iterate faster.

4 investors

Simbie AI builds healthcare workflow management software for clinical practices, automating scheduling and documentation to reduce administrative burden on providers and improve patient care.

2 investors

Singularity manufactures counter-weapon systems and air defense equipment designed to protect military personnel and civilians. The company focuses on producing affordable, mass-produced defense technology to help the US and allied nations maintain defensive capabilities against evolving threats.

3 investors

Sizeless provides an AI-powered mobile workflow for capturing construction trenches and utility connections with 3D precision. The software converts smartphone video scans into CAD-ready plans and GIS models for deep construction, district heating, and utility connection projects.

1 investor

Skyvern automates browser-based workflows using AI and computer vision, handling tasks like logging into portals, filling forms, and extracting data without APIs or custom scripts. It serves enterprise teams and developers automating repetitive portal interactions, data extraction, and compliance processes across industries.

1 investor

Slicker is an AI-powered payment recovery platform for subscription businesses that automatically recovers failed recurring transactions through smart retry timing, personalized dunning communications, and analytics. The platform helps subscription companies reduce involuntary churn and protect recurring revenue across multiple payment providers and billing systems.

1 investor

Smobi is an AI-powered messaging platform that enables brands to send interactive RCS (Rich Communication Services) and SMS campaigns directly to customers' phones. The platform offers drag-and-drop campaign builders, AI-powered customer service agents, product card carousels, and event booking capabilities, designed for ecommerce, customer engagement, and customer support use cases.

1 investor

Sohar Health is a front-end revenue cycle management platform that uses technology and machine learning to automate insurance claims processing for healthcare providers. The company serves hospitals and medical practices seeking to improve claims accuracy and patient access to care.

3 investors

Sola develops process automation software that uses AI and bots to handle repetitive tasks for enterprise teams. The platform enables organizations to automate workflows and reclaim employee time for higher-value work.

2 investors

Solve Intelligence provides AI-powered software for patent drafting, prosecution, and claim analysis for legal professionals and corporate IP departments. The platform assists with application drafting, office action responses, invention disclosure management, and claim charting across all technology fields.

10 investors

Spine is an AI research platform that orchestrates multiple AI models as parallel agents to conduct deep research and generate client-ready deliverables including reports, presentations, and spreadsheets. It serves investors, consultants, legal professionals, medical researchers, and founders across various industries.

2 investors

Stellar Sleep develops a digital solution for sleep management, founded by former insomniacs in collaboration with sleep experts.

4 investors

Strada builds AI agents that automate insurance operations, handling customer interactions across voice, email, chat, and SMS integrated into carrier, MGA, and broker systems.

2 investors

Structured Labs builds knowledge infrastructure for AI agents by converting business data into structured, high-fidelity datasets used for search, recommendations, and intelligent applications. They provide the training-data layer for the agentic internet through products including Waldium and Preswald.

1 investor

Studdy is an AI-powered tutoring platform that provides personalized 1:1 lessons via an interactive whiteboard for students learning academic subjects. The service covers a wide range of topics including math, chemistry, physics, and organic chemistry, and helps students improve understanding and academic performance.

7 investors

Subsets provides an AI-driven platform for subscription media companies to reduce customer churn and improve retention through predictive audience identification, experimentation, and automation. The platform integrates with subscription, product, and CRM data to enable commercial teams to run A/B tests, analyze results, and automate proven retention strategies without requiring engineering support.

2 investors

sudocode provides an open-source platform for managing and coordinating multiple AI coding agents, handling the technical details of context management so users can focus on directing tasks rather than monitoring individual agents.

1 investor

Surface Labs builds AI-native marketing automation software that unifies data and campaign execution across channels, replacing fragmented rule-based marketing technology platforms. The platform serves marketing teams at enterprises and scales companies.

1 investor

Sweep builds AI coding tools for JetBrains users, including autocomplete and agent features with an emphasis on speed, accuracy, and privacy. The company operates its own models to deliver a secure AI coding experience.

1 investor

Sweetspot is an AI platform for government contractors that identifies federal, state, and local contracting opportunities, manages capture pipelines, and generates proposals. It serves business development and capture teams at government contracting firms seeking to streamline opportunity discovery and bid execution.

2 investors

Synch provides a unified platform for sales and sales operations teams, accessed through Salesforce authentication without complex configuration.

2 investors

SyntheticFi provides securities-backed lending solutions to financial advisors and their clients, offering institutional-grade liquidity through structured products like box spreads. The company serves high-net-worth individuals and financial advisors seeking lower-cost borrowing alternatives to traditional mortgages and loans.

2 investors

Talc extracts structured event and data records from electronic health records for hospital systems.

1 investor

Tempo is a visual code editor for React applications that enables product managers, designers, and engineers to collaborate on component development through a design-tool interface backed by IDE functionality, with native support for Vite and Tailwind.

1 investor