Y Combinator Summer 2024 (S24) Companies

Silurian develops customized foundation models for simulating the impact of weather on assets and infrastructure. The company serves energy and government sectors.

1 investor

SimCare provides AI-powered avatar-based simulation practice for counseling and mental health training programs. The platform offers 500+ virtual client scenarios to help students develop interpersonal, counseling, and diagnostic skills across psychology, psychiatry, clinical counseling, social work, and behavioral health disciplines.

3 investors

Simple AI builds AI agents for revenue teams that automate customer interactions across voice, text, chat, and email channels. The agents perform sales and support tasks like booking appointments, following up on leads, handling objections, and personalizing recommendations to close deals.

2 investors

Simplex provides automated provider enrollment management for healthcare networks, handling CAQH profile setup, payer applications, and compliance tracking across multiple states and insurers. The platform uses AI agents to submit applications, monitor status, fix corrections, and deliver final enrollment determinations with full audit trails.

2 investors

Soff provides quoting software for manufacturers to generate and manage quotes more efficiently. The platform helps manufacturers speed up their sales process and win more deals.

2 investors

Sonatoria is an AI-powered platform for creating and managing user-generated content (UGC) video ad campaigns, matching brands with vetted creators, generating creative briefs, and handling contracting, payments, and performance analytics. It targets fast-growing startups, performance marketing teams, and e-commerce/D2C brands seeking agency-quality UGC without agency overhead.

1 investor

Sorcerer provides targeted weather observation systems and AI forecasting tools that collect atmospheric data from undermonitored regions, including over oceans and below the equator. The company serves meteorologists and forecasters to improve extreme weather prediction across North America and Central America.

2 investors

Spaceium builds in-orbit refueling stations that store fuel and supply it to spacecraft, aiming to enable longer missions, larger payloads, and farther travel. The company operates in the space infrastructure sector.

3 investors

Spherecast is an AI-powered supply chain platform that automates planning, forecasting, and execution for omni-channel consumer packaged goods (CPG) brands. It unifies demand planning, inventory optimization, purchase order recommendations, and supplier communication to replace spreadsheets and legacy planning tools.

3 investors

Spur provides an AI-powered autonomous testing platform that automatically plans, executes, and reports software tests across web and mobile applications. The platform uses natural language instructions to enable non-technical team members to create and maintain test coverage for functional, UI/UX, localization, and exploratory testing scenarios.

2 investors

Starcloud designs and deploys data centers in space to support hyperscale computing workloads, leveraging continuous solar energy and radiative cooling for gigawatt-scale AI training clusters. The company targets operators of large-scale compute infrastructure seeking alternatives to terrestrial data centers.

14 investors

Stardrift builds an AI travel agent for frequent flyers that personalizes travel planning and booking. The platform aims to make travel planning feel personal, accurate, and effortless.

1 investor

Stempad is a web-based note-taking application designed for STEM students and educators, featuring integrated tools for chemical structure drawing, mathematical equations, graphing, and diagram creation. It serves high school and university students in chemistry, math, engineering, and related fields who need a single platform to manage diverse note-taking needs without learning specialized syntax like LaTeX.

1 investor

Storia AI develops an open-source AI agent that helps software developers understand and modify code within their organization's codebase and its operational context. The tool uses retrieval-augmented generation grounded in documentation and external references to answer developer questions about architecture decisions and code integration without generating false information.

1 investor

Substrate provides agentic AI software for healthcare revenue cycle management, automating claims processing, appeals, eligibility verification, and payment posting to recover revenue leakage and increase net revenue for providers and payers.

1 investor

Superunit provides AI agents that autonomously contact HR departments, payroll systems, and managers via phone, email, and fax to verify employment, income, educational credentials, and other background check information. The platform serves hiring, lending, and leasing companies needing FCRA-compliant employment verification at scale.

1 investor

SureBright provides product protection insurance solutions that merchants embed directly into their customer checkout experience. The company handles underwriting, claims, and customer support, enabling merchants to earn incremental revenue while building customer trust.

5 investors

Synnax provides software tools for engineering teams to build hardware technology. The platform targets hardware developers and engineers working on physical products.

2 investors

Syntra provides a real-time AI audit platform that analyzes clinical charts and claims to identify coding opportunities, ensure compliance, and automate revenue cycle processes for healthcare practices. The platform integrates with existing EHR and practice management systems to deliver pre-bill review and risk-adjusted payment audits without requiring additional staff.

2 investors

Tabula develops AI-powered accounting software that automatically analyzes financial data and generates insights for business owners without requiring dedicated finance expertise.

1 investor

Tandem is a marketplace that simplifies commercial office space search for companies by consolidating market access, verified pricing and availability, and expert negotiation support in one platform. The company aims to replace the traditional fragmented brokerage process with transparent, faster office search and relocation services.

1 investor

TaxGPT provides tax information access and services to individual taxpayers and businesses. The company serves both direct customers and indirect users through partnerships.

4 investors

A forecasting platform that applies large language model technology to time series prediction for enterprise use cases. It serves organizations across industries seeking to improve accuracy in demand planning and operational forecasting without requiring large data science teams.

1 investor

Eva is an AI-powered research platform that conducts and maintains systematic reviews and meta-analyses by continuously updating them as new clinical trials emerge. It deploys AI research assistants to work alongside human expert reviewers to deliver initial analyses within 48 hours and keep findings current.

1 investor