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Voidindex alternatives & similar sites

Void Index — Vol. 1 Archive — 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
genesis6.org ↗	67 match 1 shared topics	Genesis 6 — UAP Declassified Archive	en	space-and-astronomy	robots llmsaihumans	emailphone	none
resonarchives.com ↗	66 match 1 shared topics	LDRI \| ARCHIVE ACCESS	en	space-and-astronomy	robotsllmsaihumans	emailphone	partial · 8
framesfrommars.com ↗	65 match 1 shared topics	Frames From Mars — NASA Mars Photo Archive	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
voidindex.space ↗	65 match 1 shared topics	VoidIndex	en	space-and-astronomy	robotsllmsaihumans	emailphone	partial · 8
ahistory.space ↗	65 match 1 shared topics	Space Oracle · An Archive of Spaceflight	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
aelvox.space ↗	64 match 1 shared topics	AELVOX — Interactive Astronomy Platform	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
voidclipper.space ↗	64 match 1 shared topics	Void Clipper	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
genomdatabase-foundation.org ↗	64 match 1 shared topics	Lunar Archive \| The Greatest Achievement	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
nanofiche.com ↗	64 match 1 shared topics	NanoFiche – NanoFiche Permanent Archive	en	space-and-astronomy WordPress Shopify	robotsllmsaihumans	emailphone	none
kevsmith.com ↗	64 match 1 shared topics	Index - Main Page	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
voidstar.blog ↗	64 match 1 shared topics	voidstar adventures — xiphod	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
ailien.fun ↗	63 match 1 shared topics	AILIEN — Exploring the Pumpfun Universe	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
frontierspacearchitecture.com ↗	63 match 1 shared topics	Frontier Space Architecture	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
thefact5.com ↗	63 match 1 shared topics	FACT — reality is weirder than fiction	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
franckmarchis.com ↗	63 match 1 shared topics	Franck Marchis	en	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
atlasoftheuniverse.com ↗	63 match 1 shared topics	An Atlas of The Universe	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
visitearth.xyz ↗	62 match 1 shared topics	visitearth.xyz — Your First and Only Earth Station	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
mmto.org ↗	62 match 1 shared topics	Welcome to the MMT Observatory	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.