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Palendr alternatives & similar sites

Plans — 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
planedata.co.uk ↗	66 match 1 shared topics	Planedata	GB en	space-and-astronomy	robotsllmsaihumans	emailphone	none
roadtoplanetarlia.com ↗	63 match 1 shared topics	Road to planet Arlia	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
adlerplanetarium.org ↗	62 match 1 shared topics	Home - Adler Planetarium	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	full · 20
rocketplane.com ↗	62 match 1 shared topics	Rocketplane Global, Inc.	en	space-and-astronomy Wix	robots llmsaihumans	emailphone	none
backtoapollo.com ↗	61 match 1 shared topics	Back to Apollo - We Had a Plan, Then We Made It	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
b2bs.co.uk ↗	61 match 1 shared topics	The Story Unfolds -2 planets and a coming war	GB en	space-and-astronomy	robotsllmsaihumans	emailphone	none
africapss.org ↗	61 match 1 shared topics	African Initiative for Planetary and Space Sciences	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
cienciasplanetariaslatam.com ↗	61 match 1 shared topics	Red Latinoamericana de Ciencias Planetarias y Exploración Espacial	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
aeroastro.org ↗	61 match 1 shared topics	Aerospace MCP - Comprehensive Flight Planning & Space Operations API	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
christopherscottedwards.com ↗	61 match 1 shared topics	PIXEL at NAU – Planetary Instrumentation eXperimentation and Exploration Laboratory	en	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
stormplanets.com ↗	60 match 1 shared topics	Storm Worlds - Storm worlds imagines the unimaginable, harnessing extreme alien storms and playing them out on planet Earth.	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
hedahl.net ↗	60 match 1 shared topics	Leif Hedahl Rasmussen's Personal Homepage	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
heds03.com ↗	60 match 1 shared topics	Music City Missile Club > Introduction	en	space-and-astronomy DotNetNuke/DNN	robotsllmsaihumans	email phone	none
hein-site.net ↗	60 match 1 shared topics	Home - Hein-Site.net	en	space-and-astronomy Joomla	robotsllmsaihumans	emailphone	none
heinofalcke.org ↗	60 match 1 shared topics	Heino Falcke	en	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
helensharman.com ↗	60 match 1 shared topics	Helen Sharman CMG OBE: The First British Astronaut	en	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
helensharmanastronaut.com ↗	60 match 1 shared topics	Helen Sharman CMG OBE: The First British Astronaut	en	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
helfertastro.com ↗	60 match 1 shared topics	Helfert Astrophotography	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.