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The 11 standout startups from YC’s Demo Day, according to VCs

32 d ago

YC's Spring 2026 Demo Day featured defense tech, robotics, AI infrastructure, developer tools, and AI agents. TechCrunch spoke to eight investors to identify the hottest startups. Valuations hit new highs, with at least two companies reaching $175 million or more. Repeat founders commanded premium prices. The buzziest startups, flagged by multiple investors, include: - **9 Mothers**: AI-powered counter-drone systems. Affordable robot tracks and kills drones at 60 mph. Already $1.6M in sales, with a potential $35M contract; valuation over $200M—among YC's highest ever. - **Arga Labs**: Digital twin environments for testing AI agents. Solves bottleneck of slow sandbox creation by instantly spinning up software twins for safe code testing. - **Adialante**: Mobile MRI clinics for early cancer detection. Compact MRI in a small truck, charging $250 per scan, aiming to make annual screening routine. - **Complir**: Compliance management for physical products. AI agents help manage regulations, documentation, and labels for international shipping. - **Dispatch**: Satellites that safely return products manufactured in space. Reusable vehicles for transporting pharmaceuticals, semiconductors, and tissues from microgravity to Earth. - **Lightsprint**: No-code tool for building features. Non-engineers describe changes, pick visual options, and an AI agent builds them; engineers review and merge. - **Ploy**: Automated website building and marketing growth. Founded by Webflow's co-founder, it generates landing pages, marketing copy, and campaigns. Raised $27M seed round. - **Sazabi**: AI platform to find and fix software problems. Founded by repeat YC founder. Integrates with Slack, performs log analysis, and generates fixes with one click. - **Silmaril**: AI security infrastructure. Protects AI agents from prompt injection attacks; autonomously probes threats and retrains firewalls. - **Superset**: Platform to run 100+ coding agents simultaneously. Manages CLI agents like Claude or Cursor in one space. These startups reflect investor enthusiasm for defense, space, healthcare, and AI automation, with many addressing clear market needs.