Alternatives to Castelion

The top Defense companies similar to Castelion, ranked by relevance (named competitors first, then how closely their sectors overlap) and our 0-100 AI-readiness score. Each links to a full profile with funding and team.

Open source alternatives to Castelion (48) →

Company	Sector	HQ	Funding	Score	Website
Northrop Grumman	Defense Tech	Falls Church, United States	—	68	Website
Saronic Technologies	Maritime Technology	United States	$1.8B	62
Raytheon Technologies	Aerospace	Arlington, United States	—	—	Website
Re:Build Manufacturing	Manufacturing	Framingham, United States	$545.0M	47	Website
LOLockheed Martin	Aerospace	Bethesda, United States	—	29	Website
RARaytheon	Aerospace	Waltham, USA	—	18	Website
Frankenburg Technologies	Defense	Tallinn, Estonia	$36.7M	64	Website
ONOnodrim	Defense	Amsterdam, Netherlands	$43.2M	51	Website
Molfar Defence Technologies	Defense	Warsaw, Poland	$1.5M	42	Website
HighGround	Defense	Washington, United States	$6.5M	41	Website
Occam	Defense	London, United Kingdom	$3.0M	34	Website
SISingularity Defense	Aerospace	Austin, United States	$80.0M	46	Website
Reveal	Defense	Bozeman, United States	$41.0M	63	Website
AnySignal	Defense	El Segundo, United States	—	48	Website
RARalliant	Aerospace	Raleigh, USA	$27.3M	43	Website
SISilicon Microgravity	Semiconductors	Cambridge, United Kingdom	$7.1M	40
Hermeus	Aerospace	Atlanta, United States	$350.0M	78	Website
Hadean	Defense	London, United Kingdom	$30.0M	55	Website
EGIDE	Defense	Paris, France	$8.0M	55	Website
Allen Control Systems	Defense	Austin, United States	$200.0M	55	Website
Radiant	Nuclear Energy	El Segundo, United States	$518.0M	74	Website
Arondite	Defense	London, United Kingdom	$12.3M	53	Website
Neros Technologies	Defense	El Segundo, United States	—	37	Website
URSA MAJOR	Defense Tech	Berthoud, United States	$100.0M	71	Website
Quantum Systems	Aerospace	Gilching, Germany	$1.9B	68	Website
SWEBAL	Defense	Nora, Sweden	$30.0M	46	Website
ISIsembard	Manufacturing	Bristol, United Kingdom	$59.0M	65	Website
Silvus Technologies	Defense	Los Angeles, USA	—	69	Website
Observable Space	Aerospace	Adrian, United States	$101.0M	64	Website
Integrate	Government	Seattle, United States	$17.0M	63	Website
PDW	Aerospace	Huntsville, USA	$170.0M	63	Website
Dronamics	Aerospace	Sofia, Bulgaria	$105.8M	63	Website
Redwire	Aerospace	Jacksonville, USA	$63.0M	61	Website
SkyfireAI	Aerospace	Austin, USA	$19.5M	59	Website
Mach Industries	Defense Tech	Huntington Beach, United States	$265.2M	58	Website
MAGDRIVE	SpaceTech	Harwell, United Kingdom	$12.5M	55	Website
Avy	Aerospace	Amsterdam, Netherlands	$10.0M	55	Website
Epirus	Defense	Redondo Beach, United States	$540.0M	74	Website
Kelluu	Aerospace	Finland	$17.3M	54	Website
Beyond Vision	Aerospace	Lisbon, Portugal	$3.2M	54	Website
Venus Aerospace	Aerospace	Houston, United States	$90.0M	52	Website
Cap-xx	Energy Storage	Sydney, Australia	$4.0M	50	Website
DesignVerse	Enterprise Software	Bucharest, Romania	$5.5M	50	Website
Frenel Imaging	Imaging	Modi'in-Maccabim-Re'ut, Israel	$2.0M	49	Website
DeltaQuad	Aerospace	Duivendrecht, Netherlands	$47.3M	49	Website
Cambridge Aerospace	Defense Technology	Cambridge, United Kingdom	$300.0M	47	Website
StirLight	Aerospace	United Kingdom	$1.1M	47	Website
Airbus Zephyr	Defense Tech	Portsmouth, United Kingdom	$202.4M	85	Website
Forterra	Defense	Clarksburg, United States	—	50	Website
Airvolute	Aerospace	Trnava, Slovakia	$1.5M	45	Website
Distributed Spectrum	Defense	New York, United States	—	48	Website
RSRSI Europe	Defense	Vilnius, Lithuania	$40K	23
MAMaddox Defense	Defense Tech	San Diego, United States	$5.0M	42	Website
Scout AI	Defense	San Francisco, USA	$100.0M	61	Website
Scanary	Defense	San Francisco, United States	—	45	Website
Stoke Space	SpaceTech	Kent, United States	$1.3B	74	Website
CX2	Defense	El Segundo, United States	$31.0M	52	Website
General Dynamics	Aerospace	Reston, United States	$60.0B	71	Website
Auterion	Defense	Arlington, United States	$130.0M	50	Website
MAMACHINA LABS	Manufacturing	Los Angeles, United States	$156.0M	69	Website