Startups From YC’s Spring 2026 Batch We’d Actually Remember

Arga Labs builds disposable replicas of services such as Stripe, Slack and Google Drive, letting teams test agents without touching production data. It solves a problem every serious agent developer will meet.

Adialante is redesigning MRI as a lighter mobile service that clinics can buy per scan, starting with prostate cancer. Bringing advanced screening to existing medical sites is a bold, practical idea.

Complir maps physical products to changing regulations across markets and generates the labels, warnings and records retailers need. Managing more than 100,000 products gives the pitch some welcome substance.

Ploy uses marketing and design agents to rebuild pages, write copy and run campaigns directly on a company’s website. Webflow co-founder Bryant Chou gives the product unusually relevant founder experience.

Sazabi reads application logs and code to diagnose production failures, then proposes fixes through Slack or the command line. Founder Sherwood Callaway built observability systems at Brex, which strengthens the case.

9 Mothers has already sold and delivered its compact EDDA counter-drone system to the US military. That field traction makes the company unusually real for a young hardware startup.

Dispatch is building reusable reentry vehicles for returning pharmaceuticals, semiconductor crystals and biological samples made in orbit. Its first Spark-1 flights are planned for 2027, so execution is now the story.

LightSprint lets product managers and designers describe changes, preview working software and send an engineer an auditable pull request. We like that it adds collaboration and approval around coding agents.

Silmaril blocks prompt-injection attacks inside agent frameworks and says its self-improving defense has already prevented substantial customer losses. Agent security is becoming infrastructure, not an optional feature.

Superset is an open-source desktop workspace for running many coding agents in parallel and reviewing their pull requests. Its early developer adoption suggests this is more than another IDE mock-up.