Which startups presented at the Y Combinator Demo Day in June 2026

9 Mothers — AI Systems vs. Drones

The most expensive startup in the batch, valued at over $200 million. The company is working on a solution to the problem of modern drone countermeasure systems.

9 Mothers claims to have developed an affordable AI-based robot capable of detecting, tracking, and neutralizing drones moving at speeds up to 100 km/h. The startup was founded in 2024 and has already secured contracts worth $1.6 million. One of its current contracts could be expanded to $35 million. The company plans to scale its business to a contract portfolio valued at $1 billion.

Arga Labs — Digital Twins for Testing AI Agents

AI helps engineers generate code faster than ever before. However, this code needs to be tested, and traditional testing environments—so-called sandboxes—cannot be created quickly enough. Arga Labs solves this bottleneck: the tool instantly deploys a digital twin of the company’s software environment, allowing AI agents to safely test code before it goes into production.

Adialante — Mobile MRI Clinics for Early Cancer Detection

Early detection saves lives, but the healthcare system lacks MRI machines for regular screening—they are too expensive: millions to purchase and tens of thousands per year for maintenance. Adialante has developed a compact MRI machine that can be transported in a small truck.

Business model: bring the machines to clinics and charge $250 per scan. The company’s ambitious goal is to transform MRI from a procedure for symptomatic patients into a standard annual screening.

Complir — Compliance for Physical Goods

International shipping of physical goods involves numerous regulatory requirements: translating documentation for the EU market, complying with labeling requirements in each country, and much more.

Complir creates AI agents that help businesses manage compliance, track risks and regulatory changes, and generate the necessary documentation and labels for international shipments.

Dispatch — Delivering Cargo from Space to Earth

Space—due to microgravity and an almost perfect vacuum—is an excellent environment for producing certain pharmaceuticals, semiconductors, and 3D-printed tissues and organs.

Dispatch is developing reusable capsules to return such goods to Earth. Unlike most space capsules that burn up or are discarded after a single use, Dispatch vehicles are designed for reuse—they can be serviced and sent back into space.

Lightsprint — Feature Development Without Writing Code

Lightsprint allows any user—regardless of development experience—to create and release features for applications.

Previously, for any product change, a product manager had to wait for an engineer. Now, the user explains what needs to be changed, selects from visual options, and the Lightsprint AI agent builds it for them. Once the product manager is satisfied with the result, the engineer reviews, approves, and merges the new code into the existing codebase.

Ploy — Automation of Marketing and Website Growth

The founder is Bryant Chow, co-founder and former CTO of Webflow—the drag-and-drop website builder, last valued at $4 billion. Ploy goes further: it automatically generates landing pages, writes marketing copy, and launches campaigns.

The platform’s AI agents continuously optimize website content with the aim of accelerating inbound growth—thereby promising to eliminate the need for a large marketing team. Immediately after Demo Day, Ploy announced a $27 million seed round led by First Round and Y Combinator.

Sazabi — Finding and Fixing Bugs in Production

Sazabi was founded by Sherwood Colloway—a repeat YC founder, a16z scout, and former employee of Brex and 11x. The tool helps find and fix issues in production systems.

Sazabi integrates with Slack and communicates with the team via chat. It performs log analysis—records that the program creates during operation to determine the cause of a failure—and allows users to generate and send a fix with a single click.

Silmaril — AI Agent Security

Autonomous agents are becoming increasingly common in business—and with this comes an increased risk of attacks.

Silmaril protects agents from prompt injection: situations where an agent’s public interfaces can be hacked via prompts, emails, or documents. Silmaril agents autonomously search for new threats and, upon detection, automatically retrain the firewall, developing immunity.

Superset — Platform for Managing Hundreds of Coding Agents

As the number of coding agents in development grows, there is a need to manage them in a unified environment.

Superset allows running 100 or more coding agents simultaneously. Any CLI agent—Claude, Cursor, and others—can operate on the platform, each in its own isolated space, without conflicts between them. The tool also opens in any IDE: VS Code, Cursor, and others.

Tasklet — Universal AI Agent for Work Tasks

Tasklet connects to the APIs of various work applications—Slack, Outlook, Google Drive, and others. Users assign tasks in natural language: sorting emails, extracting reports, automating workflows.

The agent works continuously—even if you close the tab. It can also write and run its own code and create interfaces. Tasklet positions itself as a single place where users come to give commands—instead of opening applications one by one.