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Thirdlines alternatives & similar sites

Thirdline — Independent governance for cybersecurity programmes — 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
spmadvisors.net ↗	69 match 2 shared topics	SPM Advisors \| Strategic Cybersecurity Advisory \| vCISO & Security Program Services	United States~ en	information-and-network-security	robotsllmsaihumans	emailphone	none
thejohnalarcon.com ↗	69 match 2 shared topics	John Alarcon — Cybersecurity Leader & Advisor	en	information-and-network-security	robotsllmsaihumans	emailphone	none
5wagency.com ↗	68 match 2 shared topics	5W Agency \| Cybersecurity Consulting for Critical Environments	Canada~ en	information-and-network-security	robotsllmsaihumans	emailphone	none
meetfellsway.com ↗	68 match 2 shared topics	Cybersecurity Consulting Firm - Fellsway	en	information-and-network-security WordPress	robotsllmsaihumans	emailphone	none
culturegem.co.uk ↗	68 match 2 shared topics	Culture Gem — Cybersecurity Consultancy Built Around People	United Kingdom en	information-and-network-security	robots llmsaihumans	emailphone	none
vjgconsulting.com ↗	67 match 2 shared topics	Saugosmintis Cybersecurity Consulting Experts \| SaugosMintis	en	information-and-network-security	robotsllmsaihumans	emailphone	none
voidsecurity.io ↗	67 match 2 shared topics	Void Security - Cybersecurity Consulting \| Fractional CISO & Security Services	en	information-and-network-security	robotsllmsaihumans	emailphone	none
egvservices.com ↗	66 match 2 shared topics	Home \| EGV Services \| India \| Cyber Security Consulting Firm	en	information-and-network-security Wix	robots llmsaihumans	emailphone	none
rollr8.com ↗	66 match 2 shared topics	Axlio Consulting \| Compliance & Information Security	en	information-and-network-security	robotsllmsaihumans	emailphone	partial · 8
1th.limited ↗	66 match 2 shared topics	1th.limited: Security and compliance consultancy for regulated technology	en	information-and-network-security	robotsllmsaihumans	emailphone	none
carbonchaincyber.com ↗	66 match 2 shared topics	Expert Cyber Security Consulting & Advisory Services	en	information-and-network-security Weebly	robotsllmsaihumans	emailphone	none
leafspine.com ↗	66 match 2 shared topics	Leafspine \| Information Security and IT Risk Consultancy	en	information-and-network-security	robotsllmsaihumans	email phone	none
247m.net ↗	66 match 2 shared topics	247M Cybersecurity & Managed Enterprise Mobility	en	information-and-network-security WordPress	robotsllmsaihumans	emailphone	none
ade.consulting ↗	66 match 2 shared topics	ADE Consulting \| Systems, Assets & OT Cyber Security	en	information-and-network-security	robotsllmsaihumans	email phone	none
7techmsp.com ↗	65 match 2 shared topics	Managed Services Provider and Cybersecurity Consulting \| 7tech	en	information-and-network-security WordPress	robotsllmsaihumans	emailphone	none
rookmay.com ↗	65 match 2 shared topics	RookMay \| Information Compliance & Security Services Provider	en	information-and-network-security WordPress	robotsllmsaihumans	email phone	none
7linesecurityconsultingllc.com ↗	65 match 2 shared topics	Security Consulting Firm \| 7 Line Security Consulting LLC	en	information-and-network-security Wix	robots llmsaihumans	emailphone	none
capstonecyber.com ↗	65 match 2 shared topics	Capstone Cyber	United Kingdom~ en	information-and-network-security	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.