Castelion vs Relativity Space
Side-by-side comparison of AI visibility scores, market position, and capabilities
Raised $350M Series B (Dec 2025). $50M US Navy contract for Blackbeard hypersonic prototyping. 1,000-acre solid rocket motor facility under construction.
About
Castelion is a defense startup developing the Blackbeard hypersonic missile system, one of the few startups with an active US Navy contract for hypersonic weapons full-scale prototyping and early operational fielding. The company raised $350 million in Series B financing in December 2025 and secured a $50 million US Navy contract for Blackbeard prototyping, directly addressing the DoD's urgency to field hypersonic strike capability as China and Russia have demonstrated operational hypersonic weapons.
Relativity Space is building the world's first fully 3D-printed rocket, using autonomous robotic manufacturing to reduce production time from years to 60 days. HQ: Long Beach, CA.
About
Relativity Space is an aerospace company pioneering a new approach to rocket manufacturing through large-scale 3D printing and autonomous robotics, with the goal of building a fully vertically integrated launch company that can design, manufacture, and launch rockets at a fraction of traditional cost and time. Founded in 2015 by Tim Ellis and Jordan Noone, former SpaceX and Blue Origin engineers, Relativity uses its proprietary Stargate metal 3D printing system — the world's largest metal 3D printer — to fabricate rocket structures from aluminum alloy, reducing part counts from 100,000+ (traditional rockets) to under 1,000.
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