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Gainsec alternatives & similar sites

GainSec - Where OSINT, Hacking, Penetration Testing, Privacy, Piracy, Information Security, Cyber Security and Law are a lifestyle. — 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 Information And Network Security →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
2pmc.net ↗	74 match 1 shared topics	IT DIY, Pentesting, Cyber Security - Documentation platform where passionate people share information about IT, cyber security, pentesting.	en	information-and-network-security WordPress	robotsllmsaihumans	emailphone	none
blackflag-sec.com ↗	72 match 1 shared topics	Black Flag Security Group - Veteran-Owned Cybersecurity & Penetration Testing	United States~ en	information-and-network-security	robotsllmsaihumans	emailphone	none
blackowlsec.com ↗	72 match 1 shared topics	BlackOwlSec - IT Security Consulting - Penetration Testing	en	information-and-network-security	robotsllmsaihumans	emailphone	none
feronsecurity.com ↗	72 match 1 shared topics	Feron Security - Expert Cybersecurity Testing & Penetration Testing Services	en	information-and-network-security	robotsllmsaihumans	emailphone	none
7asec.store ↗	71 match 1 shared topics	7ASecurity: Penetration Testing for Serious Teams \| 7ASecurity	en	information-and-network-security	robotsllmsaihumans	emailphone	none
7asecurity.online ↗	71 match 1 shared topics	7ASecurity: Penetration Testing for Serious Teams \| 7ASecurity	en	information-and-network-security	robotsllmsaihumans	emailphone	none
7asec.shop ↗	71 match 1 shared topics	7ASecurity: Penetration Testing for Serious Teams \| 7ASecurity	en	information-and-network-security	robotsllmsaihumans	emailphone	none
corestrikesecure.com ↗	71 match 1 shared topics	CoreStrikeSecure \| Cybersecurity Services & Penetration Testing	en	information-and-network-security	robotsllmsaihumans	emailphone	none
rcesecurity.eu ↗	70 match 1 shared topics	RCE Security \| Penetration Tests. Source Code Reviews. IT Security Audits.	European Union en	information-and-network-security	robotsllmsaihumans	emailphone	none
rce-security.eu ↗	70 match 1 shared topics	RCE Security \| Penetration Tests. Source Code Reviews. IT Security Audits.	European Union en	information-and-network-security	robotsllmsaihumans	emailphone	none
networking4all.eu ↗	70 match 1 shared topics	Expert in SSL, Penetration testing & Managed Security \| Networking4all	European Union en	information-and-network-security Storyblok	robotsllmsaihumans	emailphone	none
badlocksecurity.com ↗	70 match 1 shared topics	BadLock Security - Penetration Testing	en	information-and-network-security WordPress	robotsllmsaihumans	emailphone	none
impactwave.io ↗	70 match 1 shared topics	ImpactWave Security - Professional Penetration Testing Services	en	information-and-network-security	robotsllmsaihumans	emailphone	none
1hacking.com ↗	70 match 1 shared topics	1HACKING \| Ethical hacker \| Vulnerability assessment \| Penetration testing	en	information-and-network-security	robotsllmsaihumans	emailphone	partial · 8
0block.org ↗	69 match 1 shared topics	0block — We break it before they do. \| Offensive Security & Penetration Testing	en	information-and-network-security	robotsllmsaihumans	emailphone	none
blackhilsinfosec.com ↗	69 match 1 shared topics	BHIS - Black Hills Information Security, Inc.	en	information-and-network-security WordPress Shopify	robotsllmsaihumans	emailphone	none
blackhillsinfosec.com ↗	69 match 1 shared topics	BHIS - Black Hills Information Security, Inc.	en	information-and-network-security WordPress Shopify	robotsllmsaihumans	emailphone	none
blackhillsinformationsecurity.com ↗	69 match 1 shared topics	BHIS - Black Hills Information Security, Inc.	en	information-and-network-security WordPress Shopify	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.