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Detecthorizon alternatives & similar sites

detect horizon — 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
cospar-assembly.org ↗	61 match 1 shared topics	COSPAR ZARM - Online Abstract Handling	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
outofthisworldproject.com ↗	61 match 1 shared topics	outofthisworldproject \| promoting restless curiosity through space	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
3ia.net ↗	61 match 1 shared topics	3I Atlas (3I/ATLAS) - Interstellar Object Tracker \| Real-Time Data & Analysis	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
3iatlas.com ↗	61 match 1 shared topics	3I Atlas (3I/ATLAS) - Interstellar Object Tracker \| Real-Time Data & Analysis	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	partial · 13
moonviews.com ↗	61 match 1 shared topics	MoonViews – Official website of the Lunar Orbiter Image Recovery Project (LOIRP)	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
otastro.org ↗	60 match 1 shared topics	Old Town Sidewalk Astronomers \|	en	space-and-astronomy Drupal	robotsllmsaihumans	emailphone	none
otford.org ↗	60 match 1 shared topics	Otford solar system - the largest scale model in the world	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
otherworlders.com ↗	60 match 1 shared topics	Other Worlders - UFO Sightings, Aliens, Ancient Alien Theory	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
otherworldlinessproject.com ↗	60 match 1 shared topics	Home	en	space-and-astronomy Spree Commerce	robotsllmsaihumans	emailphone	none
ottawa-rocketry.org ↗	60 match 1 shared topics	Ottawa Rocketry Group \| Tripoli Rocketry Association Prefecture #69	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
our-space.org ↗	60 match 1 shared topics	Home — OurSpace	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
our250birthdayus.com ↗	60 match 1 shared topics	UNOLL — United Nations Office of Launches and Landings	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
our250birthdayusa.com ↗	60 match 1 shared topics	UNOLL — United Nations Office of Launches and Landings	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
ourastrojourney.org ↗	60 match 1 shared topics	Our Astro Journey \| Beginner Astrophotography Blog for Moon, Deep Sky & Dark Skies	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
ourmars.org ↗	60 match 1 shared topics	Home	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
ourpluto.org ↗	60 match 1 shared topics	Our Pluto \| Latest Updates and info of this former planet	en	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
outerspacermeteorites.com ↗	60 match 1 shared topics	OuterSpacer Meteorites – Welcome	en	space-and-astronomy Shopify	robots llmsaihumans	emailphone	none
outerspacetechnologies.net ↗	60 match 1 shared topics	Outer Space Technologies	en	space-and-astronomy	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.