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Ppi alternatives & similar sites

Portal Home - Pen Publishing Interactive, Inc. — 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 Publishing Industry →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
oaepublish.com ↗	73 match shared topic	OAE Publishing Inc. - Gold Open Access Journal Publisher	en	publishing-industry	robotsllmsaihumans	emailphone	none
issuu.com ↗	67 match shared topic	Issuu \| Create Interactive Flipbooks on our Digital Publishing Platform	en	publishing-industry	robotsllmsaihumans	emailphone	none
plos.org ↗	67 match shared topic	Leading the future of open science publishing - PLOS	en	publishing-industry WordPress	robotsllmsaihumans	emailphone	none
ceur-ws.org ↗	67 match shared topic	CEUR-WS.org - CEUR Workshop Proceedings (free, open-access publishing, computer science/information systems)	en	publishing-industry	robotsllmsaihumans	emailphone	none
principalpost.com ↗	67 match shared topic	Publishing Platform For Self-Authored Narratives and Press \| Principal Post	United States~ en	publishing-industry	robotsllmsaihumans	emailphone	none
m2-pi.com ↗	67 match shared topic	M2PI-M2 Publishing Inc.	en	publishing-industry	robotsllmsaihumans	email phone	none
f1000.com ↗	67 match shared topic	Open Research Publishing - Advancing Knowledge - F1000	en	publishing-industry WordPress	robotsllmsaihumans	emailphone	none
induportals-media-publishing.com ↗	67 match shared topic	induportals media publishing \| HOME	en	publishing-industry	robotsllmsaihumans	emailphone	none
f1000research.com ↗	67 match shared topic	F1000Research \| Open Access Publishing Platform \| Beyond a Research Journal	en	publishing-industry	robotsllmsaihumans	emailphone	partial · 1
schifferbooks.com ↗	67 match shared topic	Schiffer Publishing \| An Independent Book Publishing Company – Schifferbooks	en	publishing-industry Shopify	robotsllmsaihumans	emailphone	none
independentpublisher.com ↗	67 match shared topic	Independent Publisher: THE Voice of the Independent Publishing Industry	en	publishing-industry	robotsllmsaihumans	emailphone	none
ecwpress.com ↗	67 match shared topic	ECW Press \| A Canadian Indie Book Publisher \| Publishing Curiously Compelling Books Since 1974	en	publishing-industry Shopify	robotsllmsaihumans	emailphone	none
opennemas.com ↗	67 match shared topic	Opennemas - CMS for Publishing Media Industry	en	publishing-industry	robotsllmsaihumans	emailphone	none
suburbanbuzz.com ↗	67 match shared topic	SuburbanBuzz Publishing – Boutique Publisher for Independent Authors	en	publishing-industry WordPress	robotsllmsaihumans	emailphone	none
mshanken.com ↗	67 match shared topic	M. Shanken Communications, Inc. \| 50+ Years of Publishing with Integrity	United States~ en	publishing-industry WordPress	robotsllmsaihumans	emailphone	none
aspenpublishing.com ↗	67 match shared topic	Aspen Publishing \| Trusted Law Textbooks & Learning Materials	en	publishing-industry Shopify	robots llmsaihumans	emailphone	none
peertechzpublications.blog ↗	67 match shared topic	Peertechz Publications – Publishing Articles under "Open Access" with accurate review	en	publishing-industry WordPress	robotsllmsaihumans	emailphone	none
hspioas.blog ↗	67 match shared topic	Heighten Science Publications Inc. - The Open Access Publisher	en	publishing-industry WordPress	robots llmsaihumans	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.