Top Hard Tech Startups in San Francisco

Browse 1 startup in San Francisco working in Hard Tech. Every listing below is matched on location and skill set so you can discover the right company faster. Compare profiles and reach out directly.

Cactus

San Francisco

Cactus is a Y Combinator Summer 2025 company built on a simple but hard conviction: the next frontier of consumer AI isn’t in the cloud — it’s on the device in your pocket or on your wrist. Founded in 2025 and based in San Francisco, the eight-person team is building a low-latency AI engine optimized […]

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Cactus

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