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Open Cosmos alternatives & similar sites

Open Cosmos — 18 websites ranked by shared content topics, category and on-page relevance.

Each result shows its full tech stack, contacts and AI-policy — not just a name · Browse all sites in Space And Astronomy →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
2ndspace.space ↗	64 match 1 shared topics	2NDSpace \| Flight-Proven CubeSat & Nanosatellite Hardware – Ready for Your Next Mission	en	space-and-astronomy Wix	robots llmsaihumans	emailphone	none
spinsgalaxycrew.com ↗	64 match 1 shared topics	Spin's Galaxy Crew: Exploring Space Adventures and Cosmic Tales	en	space-and-astronomy Reaction Commerce	robotsllmsaihumans	emailphone	none
theuniverseepisodes.com ↗	63 match 1 shared topics	The Universe Episodes \| Cosmic Chronicles	United States~ en	space-and-astronomy WordPress WooCommerce	robots llmsaihumans	emailphone	none
crystalpalacespace.com ↗	63 match 1 shared topics	Crystal Palace Space: Exploring Astronomy, Space Tech & Cosmic Discoveries	United States~ en	space-and-astronomy	robotsllmsaihumans	emailphone	none
copy-over.com ↗	63 match 1 shared topics	COPY, OVER — Your Cosmic Relay Station \| SETI Radio Signal Explorer	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
cosmicspinpro.com ↗	63 match 1 shared topics	Cosmic Spin Pro: Exploring Astrophysics and Space Discoveries	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
aac-clyde.space ↗	62 match 1 shared topics	AAC Clyde Space \| Space Data & Satellite Constellation Providers	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
aac-clyde.space ↗	62 match 1 shared topics	AAC Clyde Space \| Space Data & Satellite Constellation Providers	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
luxaeterna.com ↗	62 match 1 shared topics	Lux Aeterna	United States~ en	space-and-astronomy	robotsllmsaihumans	emailphone	none
blackwingspace.com ↗	62 match 1 shared topics	Blackwing Space \| American-Made Nanosatellites for Space 3.0	United States~ en	space-and-astronomy	robotsllmsaihumans	emailphone	none
mckinleystation.org ↗	62 match 1 shared topics	McKinley Consortium — Permanent Human Civilization Beyond Earth	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
3craftsaerospace.com ↗	62 match 1 shared topics	TRICRAFT .AEROSPACE Division \| Discover Space Solutions - Get Started	en	space-and-astronomy Squarespace Magento	robotsllmsaihumans	emailphone	none
astroleveluppoint.com ↗	62 match 1 shared topics	Astro Level Up Point: Tips for Stargazing and Astronomy	United States~ en	space-and-astronomy	robotsllmsaihumans	emailphone	none
24sat.com ↗	62 match 1 shared topics	Home	en	space-and-astronomy WordPress	robots llmsaihumans	emailphone	partial · 8
3af-spacepropulsion.com ↗	62 match 1 shared topics	Home - 10th EDITION OF THE SPACE PROPULSION CONFERENCE	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
spli.ai ↗	62 match 1 shared topics	SPLI - Space Licensing Platform	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
avio.com ↗	62 match 1 shared topics	Avio – Advanced Space Propulsion & Aerospace Solutions	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
galileognss.eu ↗	62 match 1 shared topics	GALILEO \| European Global Navigation Satellite System	European Union en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none

How the match score works

Each match is a 0–100 similarity score — the higher it is, the more two sites resemble one another. It’s computed automatically from our own crawl data (never from what a site says about itself) by combining several independent signals, so a high score means several of them point the same way:

shared topics how many of the same fine‑grained content topics (IAB sub‑categories) both sites cover — the main signal.
same category whether they sit in the same business / industry category.
content & title how closely their titles and page descriptions line up in wording and meaning.

No single signal decides the result — they’re blended together. Treat the score as a way to rank candidates rather than an absolute percentage; the chips on each result show which signals contributed.