Topsail Alternatives & Sites Like topsail.org | Piperic Business Intelligence

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
affordablespaceflight.com ↗	60 match shared topic	Affordable Space Flight - Getting to Orbit at an Affordable Price	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
imo.net ↗	60 match shared topic	IMO \| International Meteor Organization	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
spacecenter.org ↗	60 match shared topic	Space Center Houston \| Bringing people & space closer together	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
collectspace.com ↗	60 match shared topic	collectSPACE \| where space exploration meets pop culture	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
spacecolonists.org ↗	60 match shared topic	Home Page - SpaceColonists.org	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
skyskan.com ↗	60 match shared topic	Sky-Skan – We Can Take You There™	en	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
nasa.gov ↗	55 match shared topic	NASA	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
chaoxing.com ↗	55 match shared topic	超星	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
esa.int ↗	55 match shared topic	European Space Agency	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
hamqsl.com ↗	55 match shared topic	HF Propagation and Solar-Terrestrial Data Website	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
spacetourismhq.com ↗	55 match shared topic	Space Tourism HQ LLC	en	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
space.com ↗	55 match shared topic	Space.com: NASA, Space Exploration and Astronomy News	United States~ en	space-and-astronomy	robotsllmsaihumans	emailphone	none
copernicus.eu ↗	55 match shared topic	Homepage \| Copernicus	European Union en	space-and-astronomy Drupal	robotsllmsaihumans	emailphone	none
eso.org ↗	55 match shared topic	ESO	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
moonconnection.com ↗	55 match shared topic	Moon Information Resource And Guide	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
rocket.domains ↗	55 match shared topic	Rocket: Light Years Ahead	en	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
rasc.ca ↗	55 match shared topic	RASC \| Inspiring Interest and Knowledge of Astronomy Since 1868	Canada en	space-and-astronomy Drupal	robotsllmsaihumans	emailphone	none
hubblesite.org ↗	55 match shared topic	Hubble Space Telescope - NASA Science	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.

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How the match score works