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Hackerone alternatives & similar sites

HackerOne | Leader in Continuous Threat Exposure Management | Security for AI — 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
tenable.com ↗	99 match 305 shared linkers · same topic	Vulnerability and exposure management \| Cloud and AI security \| Tenable®	en	information-and-network-security Drupal	robotsllmsaihumans	emailphone	none
remnux.org ↗	120 match 303 shared linkers · same topic	REMnux: A Linux Toolkit for Malware Analysts	en	information-and-network-security	robotsllmsaihumans	emailphone	none
objective-see.org ↗	120 match 303 shared linkers · same topic	Objective-See Foundation	en	information-and-network-security	robotsllmsaihumans	emailphone	none
blackarch.org ↗	114 match 303 shared linkers · same topic	BlackArch Linux - Penetration Testing Distribution	en	information-and-network-security	robotsllmsaihumans	emailphone	none
distrosea.com ↗	112 match 303 shared linkers · same topic	Test Linux distros online - DistroSea	en	operating-systems	robotsllmsaihumans	emailphone	none
censys.io ↗	112 match 304 shared linkers · same topic	Censys \| The Authority for Internet Intelligence and Insights	en	information-and-network-security WordPress	robotsllmsaihumans	emailphone	none
c99.nl ↗	112 match 303 shared linkers · same topic	c99.nl \| Premium Tools	Netherlands nl	technology-and-computing	robotsllmsaihumans	emailphone	none
thecyberwire.com ↗	110 match 303 shared linkers · same topic	Your Cybersecurity News Connection - Cyber News \| CyberWire	United States~ en	information-and-network-security	robotsllmsaihumans	emailphone	none
cryptopals.com ↗	109 match 303 shared linkers · same topic	The Cryptopals Crypto Challenges		technology-and-computing	robotsllmsaihumans	emailphone	none
frida.re ↗	109 match 304 shared linkers · same topic	Frida • A world-class dynamic instrumentation toolkit \| Observe and reprogram running programs on Windows, macOS, GNU/Linux, iOS, watchOS, tvOS, Android, FreeBSD, and QNX	en	software-and-applications	robotsllmsaihumans	emailphone	none
dns-oarc.net ↗	108 match 303 shared linkers · same topic	Home \| DNS-OARC	en	computer-networking Drupal	robotsllmsaihumans	emailphone	none
dyne.org ↗	107 match 303 shared linkers · same topic	Digital Community and Free Software Foundry	en	software-and-applications WordPress	robots llmsaihumans	emailphone	none
bugcrowd.com ↗	106 match 487 shared linkers · same topic	#1 Crowdsourced Cybersecurity Platform \| Bugcrowd	en	information-and-network-security WordPress	robotsllmsaihumans	emailphone	none
metasploit.com ↗	104 match 304 shared linkers · same topic	Metasploit \| Penetration Testing Software, Pen Testing Security \| Metasploit	en	information-and-network-security	robotsllmsaihumans	emailphone	none
lockpickworld.com ↗	100 match 303 shared linkers	Lock Pick Sets, Lock Picks & Locksmith Tools for Lock pick enthusiasts	en	shopping Shopify	robotsllmsaihumans	emailphone	none
portswigger.net ↗	99 match 323 shared linkers · same topic	Web Application Security, Testing, & Scanning - PortSwigger	en	information-and-network-security	robotsllmsaihumans	emailphone	none
cryptohack.org ↗	98 match 304 shared linkers	CryptoHack – A free, fun platform for learning cryptography	en	online-education	robotsllmsaihumans	emailphone	none
kali.org ↗	94 match 307 shared linkers · same topic	Kali Linux \| Penetration Testing and Ethical Hacking Linux Distribution	en	information-and-network-security	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.