Y Combinator Fall 2026 (F26) Companies

Roma is a task management app that uses AI to act on user input typed or spoken as notes, ideas, or reminders, and connects to a user's calendar, email, and files to determine and carry out follow-up actions. It serves individuals looking to organize and automate personal tasks.

1 investor

Sentient is a free, open-source macOS application that runs an on-device LLM to build a personal knowledge base from a user's files and proactively completes tasks through computer use. It stores data locally in plain markdown, uses a small on-device model plus the user's own frontier model (ChatGPT, Claude, OpenRouter, or LM Studio), and is optimized for Apple silicon.

1 investor

Shepherd Robotics develops general-purpose robots for skilled physical tasks, using robot foundation models and modular hardware trained on real-world and simulation data to handle manipulation work. Its systems target data center construction and operations, cable and wire manufacturing, wire harness assembly, kitting, and factory packaging for the AI infrastructure and advanced manufacturing sectors.

1 investor

Simantic develops hardware simulation software that enables engineers and AI systems to test and debug embedded firmware without physical hardware constraints.

1 investor

Simulithic runs AI agent simulations that model real user cohorts—built from a product's last 90 days of session data—to predict how experiments and product variants will perform before shipping to real users. It integrates with session tools like Clarity and PostHog and returns predicted metrics such as lift, confidence intervals, churn, and activation for product and growth teams.

1 investor

Sinter operates a US-based plastics manufacturing pipeline using additive technologies, helping hardware teams move from 3D-printed prototypes to production parts on week-scale timelines.

1 investor

Sintropix offers an automated accounting platform that handles bookkeeping and financial close processes for companies operating across multiple countries.

1 investor

Sona8 provides a voice agent that interviews a company's employees about how their work is done, generating process maps and lists of reported problems by site and team, then follows up after each rollout to track what changed. It is used by consulting firms and corporate transformation and development teams to gather input and guide the execution of strategic change initiatives.

1 investor

SuperRadiant develops general-purpose robotic systems that combine scientific reasoning with physical experimentation, observing, forming hypotheses, and running experiments to pursue scientific discovery. The systems are aimed at automating the experimental research process.

1 investor

Talos builds non-invasive, magnet-mounted sensors that continuously monitor critical power equipment such as large transformers, detecting vibration, magnetic/EMF, temperature, and humidity anomalies to flag potential faults early. It identifies where a problem occurs on a 3D view of the machine and gives maintenance teams alerts explaining what changed and what steps to take before mechanical failures occur.

1 investor

The Agentic Data Co. builds and collects audio datasets used to train speech models, serving developers and organizations working on speech and voice AI.

1 investor

The Company Company develops software agents and infrastructure for operating businesses, serving companies that want to automate their operations.

1 investor

The Subvocal Company develops a wearable device that detects silent, subvocalized speech, allowing users to control and interact with a computer at the pace of speaking without producing audible sound. It targets people who want a quiet, discreet alternative to voice input.

1 investor

Tilion provides self-healing browser infrastructure that runs large volumes of automated agent operations on the web without supervision. It serves teams that need to perform large-scale data collection, agentic workflows, and continuous web monitoring.

1 investor

Tire Swing provides AI-powered income verification and applicant eligibility screening for affordable housing programs, helping property managers streamline tenant certification processes.

1 investor

twentyfour26 develops autonomous CNC machining cells for on-demand, rapid prototyping, giving hardware engineering teams faster part iteration. It operates in the CNC manufacturing and prototyping industry.

1 investor

Veeza is an AI-powered visa application assistant that fills out government visa forms, verifies documents, and books embassy or visa-centre appointments, with a human expert reviewing each application before submission. It serves travelers applying for Schengen, UK, and US visas, with an initial focus on applicants from Egypt and the Global South.

1 investor

Veltha builds AI software that automatically checks insurance claims against the relevant regulations, producing cited accept/deny recommendations for reviewers. It targets compliance-heavy insurance lines such as crop insurance and workers' compensation compensability claims.

1 investor

Vorelios develops foundation models that learn physics to run engineering simulations in seconds at lower cost than traditional methods. The company serves engineering and product development teams that rely on physical simulation.

1 investor

Vyra offers an automated video editing tool that lets users upload footage and describe their desired result in plain language, returning a finished edit without requiring timeline-based editing skills. It is aimed at people who are not professional video editors.

1 investor

Workers IO offers a testing platform that maps the production scenarios software may encounter and verifies each release against them in simulation environments, returning failures as exact, replayable runs. It is aimed at engineering teams looking to catch bugs before shipping.

1 investor